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User’s Guide
February 2002
Mixed Signal Products
SLOU121
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EVM IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION
PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided
may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective
considerations, including product safety measures typically found in the end product incorporating the goods.
As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic
compatibility and therefore may not meet the technical requirements of the directive.
Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the kit may be returned
within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE
WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED,
IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY
PARTICULAR PURPOSE.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user
indemnifies TI from all claims arising from the handling or use of the goods. Please be aware that the products
received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open construction
oftheproduct, itistheuser’sresponsibilitytotakeanyandallappropriateprecautionswithregardtoelectrostatic
discharge.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE
TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not
exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or
infringement of patents or services described herein.
Please read the EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM
User’sGuidepriortohandlingtheproduct. Thisnoticecontainsimportantsafetyinformationabouttemperatures
and voltages. For further safety concerns, please contact the TI application engineer.
Persons handling the product must have electronics training and observe good laboratory practice standards.
No license is granted under any patent right or other intellectual property right of TI covering or relating to any
machine, process, or combination in which such TI products or services might be or are used.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2002, Texas Instruments Incorporated
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EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the specified input and output ranges described in
the EVM User’s Guide.
Exceeding the specified input range may cause unexpected operation and/or irreversible
damage to the EVM. If there are questions concerning the input range, please contact a TI
field representative prior to connecting the input power.
Applyingloadsoutsideofthespecifiedoutputrangemayresultinunintendedoperationand/or
possible permanent damage to the EVM. Please consult the EVM User’s Guide prior to
connecting any load to the EVM output. If there is uncertainty as to the load specification,
please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than
60°C. The EVM is designed to operate properly with certain components above 60°C as long
as the input and output ranges are maintained. These components include but are not limited
tolinearregulators, switchingtransistors, passtransistors, andcurrentsenseresistors. These
types of devices can be identified using the EVM schematic located in the EVM User’s Guide.
When placing measurement probes near these devices during operation, please be aware
that these devices may be very warm to the touch.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2002, Texas Instruments Incorporated
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Preface
Read This First
How to Use This Manual
This document contains the following chapters:
- Chapter 1—Introduction
- Chapter 2—Quick Start
- Chapter 3—Details
- Chapter 4—Reference
Information About Cautions and Warnings
This book may contain cautions and warnings.
This is an example of a caution statement.
A caution statement describes a situation that could potentially
damage your software or equipment.
This is an example of a warning statement.
A warning statement describes a situation that could potentially
cause harm to you.
The information in a caution or a warning is provided for your protection.
Please read each caution and warning carefully.
v
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Related Documentation From Texas Instruments
Related Documentation From Texas Instruments
- TI Plug-N-Play Audio Amplifier Evaluation Platform (literature number
SLOU011) provides detailed information on the evaluation platform and
its use with TI audio evaluation modules
- TPA6011A4 Stereo 2-W Audio Power Amplifier (literature number
SLOS392) This is the data sheet for the TPA6011A4 audio amplifier inte-
grated circuit.
FCC Warning
This equipment is intended for use in a laboratory test environment only. It
generates, uses, and can radiate radio frequency energy and has not been
tested for compliance with the limits of computing devices pursuant to subpart
J of part 15 of FCC rules, which are designed to provide reasonable protection
against radio frequency interference. Operation of this equipment in other
environments may cause interference with radio communications, in which
case the user at his own expense will be required to take whatever measures
may be required to correct this interference.
vi
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Contents
1
2
3
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.1
1.2
1.3
Feature Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
TPA6011A4 EVM Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Quick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1
2.2
2.3
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Quick Start List for Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Quick Start List for Stand-Alone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1
3.2
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
The TPA6011A4 Audio Power Amplifier Evaluation Module . . . . . . . . . . . . . . . . . . . . . . . 3-3
3.2.1 TPA6011A4 Audio Amplifier IC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.2.2 Inputs and Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
3.2.3 Volume Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
3.2.4 Differential Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
3.2.5 Depop Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
3.2.6 BTL Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
3.2.7 Single-Ended Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Using the TPA6011A4 EVM With the Plug-N-Play Evaluation Platform . . . . . . . . . . . . 3-10
3.3.1 Installing and Removing EVM Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
3.3.2 TPA6011A4 Module Jumper Settings and Switches . . . . . . . . . . . . . . . . . . . . . 3-10
3.3.3 Signal Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
3.3.4 Mute (Shutdown)/Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
3.3.5 Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
3.3.6 Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Using the TPA6011A4 EVM Stand-Alone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
3.4.1 TPA6011A4 EVM Connected for BTL Output . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
3.4.2 TPA6011A4 EVM Connected for Single-Ended Output . . . . . . . . . . . . . . . . . . . 3-18
3.3
3.4
4
Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.1
4.2
TPA6011A4 EVM Layers and Board Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
TPA6011A4 EVM Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
vii
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Figures
1–1
2–1
2–2
2–3
3–1
3–2
3–3
3–4
3–5
3–6
3–7
3–8
3–9
The TI TPA6011A4 Audio Amplifier Evaluation Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Quick Start Platform Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Module Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Quick Start Module Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
The TI Plug-N-Play Audio Amplifier Evaluation Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
TPA6011A4 EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
TPA6011A4 EVM Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
TPA6011A4 Amplifier IC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Block Diagram of SE Volume Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
TPA6011A4 EVM Jumpers and Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Platform Signal Routing and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Mute/Mode and Polarity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Typical Headphone Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
3–10 TPA6011A4 EVM Connected for Stereo BTL Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
3–11 TPA6011A4 EVM Connected for Stereo Single-Ended Output . . . . . . . . . . . . . . . . . . . . . . 3-18
4–1
4–2
4–3
TPA06011A4 EVM Top View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
TPA06011A4 EVM Bottom View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
TPA06011A4 EVM Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Tables
2–1
2–2
2–3
2–4
3–1
3–2
3–3
3–4
4–1
Typical TI Plug-N-Play Platform Jumper and Switch Settings for the TPA6011A4 . . . . . . 2-1
Typical TPA6011A4 EVM Jumper Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Platform Jumper and Switch Settings for the TPA6011A4 . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Typical TPA6011A4 EVM Jumper Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
DC Volume Control (BTL Mode, V
= 5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
DD
DC Volume Control (SE Mode, V
= 5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
DD
Typical TPA6011A4 EVM Jumper Settings for BTL Stand-Alone . . . . . . . . . . . . . . . . . . . . 3-17
Typical TPA6011A4 EVM Jumper Settings for Single-Ended Stand-Alone . . . . . . . . . . . . 3-18
TPA6011A4 EVM Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
viii
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Chapter 1
Introduction
This chapter provides an overview of the Texas Instruments (TI) TPA6011A4
audio amplifier evaluation module (SLOP389). It includes a list of EVM
features, a brief illustrated description of the module, and a list of EVM
specifications.
Topic
Page
1.1 Feature Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2
1.2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3
1.3 TPA6011A4 EVM Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3
1-1
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Feature Highlights
1.1 Feature Highlights
The TI TPA6011A4 audio amplifier evaluation module and the TI plug-n-play
audio amplifier evaluation platform include the following features:
- TPA6011A4 stereo 2-W audio power amplifier evaluation module
J
J
J
J
J
J
Internal depop circuitry to minimize transients in outputs
Dual channel, bridge-tied load (BTL) or single-ended (SE) operation
2 W per channel output power into 3 Ω at 5 V, BTL
Low current consumption in shutdown mode (20 µA)
Internal input MUX selects among two sets of stereo inputs
DC voltage volume control from 20 dB to –40 dB, and –85 dB mute
(BTL Mode)
J
J
J
J
SE dc voltage volume control proportional to BTL gain setting
Maximum SE volume control setting via SEMAX terminal
Differential stereo inputs
A fade mode slowly ramps up or down the volume when coming out of
or going into shutdown.
- Quick and easy configuration with the TI plug-n-play audio amplifier
evaluation platform
J
Evaluation module is designed to simply plug into the platform,
automatically making all signal, control, and power connections
J
J
J
J
Platform provides flexible power options
Jumpers on the platform select power and module control options
Switches on the platform route signals
Platform provides quick and easy audio input and output connections
- Platform power options
J
J
J
J
External 5-V – 15-V DC V
supply inputs
CC
External regulated V
supply input
DD
Socket for onboard 5-V/3.3-V V
voltage regulator EVM
DD
Onboard overvoltage and reverse polarity power protection
- Platform audio input and output connections
J
J
J
J
J
Left and right RCA phono jack inputs
Miniature stereo phone jack input
Left and right RCA phono jack outputs
Left and right compression speaker terminal outputs
Miniature stereo headphone jack output
1-2
Introduction
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Description
1.2 Description
The TPA6011A4 stereo 2-W audio power amplifier evaluation module is a
complete, 2-W per channel stereo audio power amplifier with dc volume
control. It consists of the TI TPA6011A4 stereo 2-W audio power amplifier IC
along with a small number of other parts mounted on a circuit board that
measures approximately 2 1/4 inches by 1 1/2 inches (see Figure 1–1).
Figure 1–1. The TI TPA6011A4 Audio Amplifier Evaluation Module
Single in-line header pins extend from the underside of the module circuit
board to allow the EVM to be plugged into the TI plug-n-play audio amplifier
evaluation platform, or to be wired directly into existing circuits and equipment
when used stand-alone.
The platform has room for a single TPA6011A4 evaluation module and is a
convenient vehicle for demonstrating TI’s audio power amplifier and related
evaluation modules. The EVMs simply plug into the platform, which
automatically provides power to the modules, interconnects them correctly,
andconnectsthemtoaversatilearrayofstandardaudioinputandoutputjacks
and connectors. Easy-to-use configuration controls allow the platform and
EVMs to quickly model many possible end-equipment configurations.
There is nothing to build, nothing to solder, and nothing but the speakers
included with the platform to hook up.
1.3 TPA6011A4 EVM Specifications
Supply voltage range, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5 V to 5.5 V
DD
Supply current, I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 A max
DD
Continuous output power per channel, P : 3-Ω BTL, V =5 V . . . . . . . 2 W
O
DD
Audio input voltage, V : HP input . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Vpp max
I
Line input . . . . . . . . . . . . . . . . . . . . . . . . 5 Vpp max
Minimum load impedance, R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Ω
L
1-3
Introduction
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1-4
Introduction
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Chapter 2
Quick Start
The steps in this chapter can be followed to quickly prepare the TPA6011A4
audio amplifier EVM for use. Using the TPA6011A4 with the TI plug-n-play
audio amplifier evaluation platform is a quick and easy way to connect power,
signal and control inputs, and signal outputs to the EVM using standard
connectors. However, the audio amplifier evaluation module can be used
stand-alone by making connections directly to the module pins, and can be
wired directly into existing circuits or equipment.
The platform switch and jumper settings shown in Table 2–1 are typical for the
TPA6011A4 EVM and will cause the TPA6011A4 to switch to single-ended out-
put mode when a plug is inserted into platform headphone jack J10.
Table 2–1. Typical TI Plug-N-Play Platform Jumper and Switch Settings for the
TPA6011A4
EVM
JP6
JP7
JP8
S2
S3
P-N-P Platform
Mode
X
Hi
Note 2
U2–U4
Notes: 1) X = Don’t care
2) Set S2 to ON when signal conditioning board is installed in U1; set S2
to OFF when no signal conditioning board is installed.
Table 2–2. Typical TPA6011A4 EVM Jumper Settings
EVM
J1
J2
J3
J4
TPA6011A4
OFF
OFF
ON
OFF
Note: ON = Shunt installed
OFF = Open
Topic
Page
2.1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2
2.2 Quick Start List for Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–3
2.3 Quick Start List for Stand-Alone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5
2-1
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Precautions
2.1 Precautions
Power Supply Input Polarity and Maximum Voltage
Always ensure that the polarity and voltage of the external power
connected to V
power input connector J1, J2, and/or V
power
CC
DD
input connector J6 are correct. Overvoltage or reverse-polarity
power applied to these terminals can open onboard soldered-in
fuses and cause other damage to the platform, installed evaluation
modules, and/or the power source.
Inserting or Removing EVM Boards
Do not insert or remove EVM boards with power applied—damage
to the EVM board, the platform, or both may result.
Figure 2–1. Quick Start Platform Map
7b
1
13
7b
7b
ICC
JP4
C1+
F1
VR1
7a
DC
Power
In/Out
7b
Power
Input
R2
R1
Audio
Power
Amps
Signal Conditioning
9
10
Audio
Input
Speaker
Output
Mode
Mute
5
Polarity
Lo
****CAUTION****
Do not insert or remove
EVM boards with power
applied
Hi
Stereo
Headphone
Output
Plug-N-Play Audio Amplifier
Evaluation Platform
SLOP097 Rev. C.1
R3
R4
HP Out
R5
3
2
6
4
2-2
Quick Start
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Quick Start List for Platform
2.2 Quick Start List for Platform
Follow these steps when using the TPA6011A4 EVM with the TI plug-n-play
audio amplifier evaluation platform (see the platform user’s guide, SLOU011,
for additional details). Numbered callouts for selected steps are shown in
Figure 2–1 and Figure 2–2, and details appear in Chapter 3.
- Platform Preparations
1) EnsurethatallexternalpowersourcesaresettoOFFandthattheplatform
power switch S1 is set to OFF.
2) Install a TPA6011A4 module in platform socket U2, taking care to align the
module pins correctly.
3) Use switch S2 to select or bypass the signal conditioning EVM (U1).
4) Set control signal polarity jumper JP8 to Hi.
5) Set jumper JP6 to select the Mode control input (causes the TPA6011A4
to switch to the single-ended output mode if a plug is inserted into platform
headphone jack J10).
6) If the headphone jack (J10) output will be used, set headphone source
switch S3 to U2–U4.
Table 2–3. Platform Jumper and Switch Settings for the TPA6011A4
EVM
P-N-P Platform
JP6
Mode
JP7
JP8
Hi
S2
S3
X
Note 2
U2–U4
Notes: 1) X = Don’t care
2) Set S2 to ON when signal conditioning board is installed in U1; set S2
to OFF when no signal conditioning board is installed.
- Power Supply
7) Select and connect the power supply (ensure power supply is set to OFF ):
a) Connectanexternalregulatedpowersupplysetto5VtoplatformV
DD
power input connector J6 taking care to observe marked polarity,
or
b) Install a voltage regulator EVM (SLVP097 or equiv.) in platform socket
U6. Connect a 7 V – 12 V power source to a platform V power input
CC
J1 or J2 and jumper the appropriate power input (see platform user’s
guide).
- Inputs and Outputs
8) Ensure that the audio signal source level is set to minimum.
9) Connect the audio source to left and right RCA phono jacks J3 and J5 or
stereo miniature phone jack J4.
10) Connect speakers to left and right RCA jacks J7 and J9 or to stripped wire
speaker connectors J8.
- Evaluation Module Preparations
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Quick Start List for Platform
Figure 2–2. Module Preparation
11
13
12
16
14
17
18
19
Table 2–4. Typical TPA6011A4 EVM Jumper Settings
EVM
J1
J2
OFF
J3
J4
TPA6011A4
OFF
ON
OFF
Note: ON = Shunt installed, OFF = Open
11) To allow the module SE/BTL control input to switch the amplifier IC
between single ended (SE) and bridge-tied load (BTL) output modes, set
output mode jumper J1 to OFF. To keep the module amplifier IC in the
single-ended output mode regardless of the control input state, set jumper
J1 to ON.
12) To allow the module HP/LINE control input to switch the amplifier IC
between using the HP pins and the LINE pins as the signal inputs, set the
input mode jumper J2 to OFF. To keep the amplifier IC in the HP input
mode regardless of the control input state, set jumper J2 to ON.
13) To allow the amplifier IC to switch from the LINE inputs to the HP inputs
when the output switches from BTL output mode to SE output mode and
vice versa, set jumper J3 to ON. To allow the inputs and output modes to
switch independently, set jumper J3 to OFF. Jumper J3 ties the HP/LINE
and SE/BTL pins together on the EVM.
14) To place the amplifier in FADE mode, install jumper J4. FADE mode slowly
rampsupordownthegainoftheamplifierwhenleavingorenteringSHUT-
DOWN mode.
- Power Up
Platform LED2 should light indicating the presence of V , and the evaluation
DD
modules installed on the platform should begin operation.
15) Adjust the signal source level as needed.
16) AdjusttheBTL(speaker)volumeasneededbyturningtheR5potentiome-
ter in the clockwise direction to increase the volume. Turn in the counter
clockwise direction to decrease the volume. The VOL pin on the right side
of the EVM is provided to monitor the dc voltage. See Table 3–1 for gain
settings.
2-4
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Quick Start List for Stand-Alone
17) Adjust the SE (headphone) volume by adjusting potentiometer R6. Turn-
ing R6 in the clockwise direction decreases the voltage on the SEDIFF ter-
minal and the SE gain increases. Turning R6 in the counter clockwise di-
rection increases the SEDIFF voltage and decreases the SE volume.
18) Set the maximum possible SE gain by adjusting R7. Turning R7 in the
clockwise direction sets the limit higher; turning R7 in the counter clock-
wise direction lowers the SE gain limit.
19) Press and hold switch S1 down to place the amplifier in the SHUTDOWN
state. Release for normal operation.
2.3 Quick Start List for Stand-Alone
Follow these steps to use the TPA6011A4 EVM stand-alone or when
connecting it into existing circuits or equipment. Connections to the
TPA6011A4 module header pins can be made via individual sockets,
wire-wrapping, or soldering to the pins, either on the top or the bottom of the
module circuit board. Numbered callouts for selected steps are shown in
Figure 2–3, and details appear in Chapter 3.
Figure 2–3. Quick Start Module Map
8
6
7
11
12
13
- Power Supply
1) Ensure that all external power sources are set to OFF.
2) Connect an external regulated power supply set to 5 V to the module VDD
and GND pins taking care to observe marked polarity.
- Inputs and Outputs
3) Ensure that audio signal source level adjustments are set to minimum.
4) Connect the right (left) positive lead of the audio source to the module
R LINE– (L LINE–) pins and the negative lead to the R IN+ (L IN+) pins.
If using the headphone inputs, connect the positive audio source to the
module R HP (L HP) and the negative lead to R IN+ (L IN+). The inputs
2-5
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Quick Start List for Stand-Alone
can be used with a differential or single-ended audio source, but the
headphone and line have common positive inputs.
5) Select output mode:
a) For BTL output, connect a speaker to the module OUT+ and OUT–
pins of each channel,
or
b) For single-ended output, connect a headphone or a speaker to the
module OUT+ and GND pins of each channel through a 33-µF to
1000-µF output-coupling capacitor (see Figure 3–10).
- Evaluation Module Preparations
6) To allow the module SE/BTL control input to switch the amplifier IC
between single ended (SE) and bridge-tied load (BTL) output modes, set
output mode jumper J1 to OFF. To keep the module amplifier IC in the
single-ended output mode regardless of the control input state, set jumper
J1 to ON.
7) To allow the module HP/LINE control input to switch the amplifier IC
between using the HP pins and the LINE pins as the signal inputs, set the
input mode jumper J2 to OFF. To keep the amplifier IC in the HP input
mode regardless of the control input state, set jumper J2 to ON.
- Control Inputs
8) To allow the amplifier IC to switch from the LINE inputs to the HP inputs
when the output switches from BTL output mode to SE output mode and
vice versa, set jumper J3 to ON. To allow the inputs and output modes to
switch independently, set jumper J3 to OFF. Connect control lines to the
various module control input pins as needed:
a) SE/BTL: A high selects the single-ended (SE) output mode; a low or
float selects the bridge-tied load (BTL) output mode.
b) HP/LINE: A high selects headphone inputs (pins 4 and 10); a low or
float selects line inputs (pins 5 and 9).
c) SHUTDOWN: A low shuts down the amplifier IC on the module; a high
or float allows normal operation.
d) FADE: A low places the amplifier in FADE mode which slowly
increases/decreases the gain when leaving/entering the
SHUTDOWN state; a high or float allows a quick ramp of gain when
entering/leaving SHUTDOWN.
- Power-Up
9) Verify correct voltage and input polarity and set the external power supply
to ON.
The EVM should begin operation.
10) Adjust the signal source level as needed.
11) Adjust the BTL (speaker) volume as needed by turning the RS potentiom-
eter in the clockwise direction to increases the volume. Turn in the counter
clockwise direction to decrease the volume. The VOL pin on the right side
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Quick Start List for Stand-Alone
of the EVM is provided to monitor the dc voltage. See Table 3–1 for gain
settings.
12) Adjust the SE (headphone) volume by adjusting potentiometer R6.
Turning R6 in the clockwise direction decreases the voltage on the
SEDIFF terminal and the SE gain increases. Turning R6 in the counter
clockwise direction increases the SEDIFF voltage and decreases the SE
volume.
13) Set the maximum possible SE gain by adjusting R7. Turning R7 in the
clockwise direction sets the limit higher; turning R7 in the counter
clockwise direction lowers the SE gain limit.
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Chapter 3
Details
This chapter provides details on the TPA6011A4 IC, the evaluation module,
and the steps in the Quick-Start List, additional application information, and a
parts list for the TPA6011A4 evaluation module.
Topic
Page
3.1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2
3.2 The TPA6011A4 Audio Power Amplifier Evaluation Module . . . . . . . 3–3
3.3 Using the TPA6011A4 EVM With the Plug-N-Play
Evaluation Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–10
3.4 Using The TPA6011A4 EVM Stand-Alone . . . . . . . . . . . . . . . . . . . . . . 3–17
3-1
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Precautions
3.1 Precautions
Power Supply Input Polarity and Maximum Voltage
Always ensure that the polarity and voltage of the external power
connected to V
power input connector J1, J2, and/or V
power
CC
DD
input connector J6 are correct. Overvoltage or reverse-polarity
power applied to these terminals can open onboard soldered-in
fuses and cause other damage to the platform, installed evaluation
modules, and/or the power source.
Inserting or Removing EVM Boards
Do not insert or remove EVM boards with power applied—damage
to the EVM board, the platform, or both may result.
Figure 3–1. The TI Plug-N-Play Audio Amplifier Evaluation Platform
ICC
JP4
C1+
F1
VR1
DC
Power
In/Out
Power
Input
R2
R1
Audio
Power
Amps
Signal Conditioning
Audio
Input
Speaker
Output
Mode
Mute
Polarity
Lo
****CAUTION****
Do not insert or remove
EVM boards with power
applied
Hi
Stereo
Headphone
Output
Plug-N-Play Audio Amplifier
Evaluation Platform
SLOP097 Rev. C.1
R3
R4
HP Out
R5
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The TPA6011A4 Audio Power Amplifier Evaluation Module
3.2 The TPA6011A4 Audio Power Amplifier Evaluation Module
The TPA6011A4 audio power amplifier evaluation module is powered by a
TPA6011A4 stereo power amplifier capable of delivering greater than 2 W of
continuouspowerperchannelinto3-Ω loads. TheamplifierICcanbeoperated
in either the BTL or single-ended output mode. The evaluation module
includes control inputs for shutdown, selection between two sets of stereo
inputs, and switching between single-ended and bridge-tied load output
modes.
The module can be used with the TI plug-n-play audio amplifier evaluation
platform (Figure 3–1) or wired directly into circuits or equipment. The module
has single in-line header connector pins mounted to the under side of the
board. These pins allow the module to be plugged into the TI platform, which
automatically makes all the signal input and output, power, and control
connections to the module.
The module connection pins are on 0.1-inch centers to allow easy use with
standard perf board and plug board-based prototyping systems. Or, the EVM
can be wired directly into existing circuits and equipment when used
stand-alone.
The module appears in Figure 3–2 and its schematic is shown in Figure 3–3.
Figure 3–2. TPA6011A4 EVM
3-3
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The TPA6011A4 Audio Power Amplifier Evaluation Module
Figure 3–3. TPA6011A4 EVM Schematic Diagram
ROUT–
24
ROUT+
ROUT+
V
DD
1
GND
PGND
J1
R1
100 kΩ
2
3
23
22
C11
C10
ROUT–
SE/BTL
SE/BTL
J3
10 µF
0.47 µF
HP/LINE
HP/LINE
J2
R2
100 kΩ
PV
DD
C1
0.47 µF
V
4
DD
21
R HP
R LINE–
R IN
RHPIN
RLINEIN
RIN
VOLUME
SEDIFF
VOLUME
C2
0.47 µF
V
20
DD
DD
DD
5
C3
0.47 µF
V
19
6
SEMAX
AGND
C7
V
DD
V
18
0.47 µF
7
V
DD
GND
C8
0.47 µF
C4
0.47 µF
8
17
L IN
L LINE–
L HP
LIN
BYPASS
C5
0.47 µF
V
DD
J4
R3
9
LLINEIN
LHPIN
100 kΩ
C6
16
15
0.47 µF
FADE
FADE
SDZ
10
11
12
SHUTDOWN
R4
S1
100 kΩ
V
DD
PV
DD
V
DD
14
13
C9
0.47 µF
LOUT+
PGND
LOUT+
GND
LOUT–
LOUT–
3.2.1 TPA6011A4 Audio Amplifier IC
The TPA6011A4 audio amplifier IC (see Figure 3–4) is a CMOS device
intended primarily for bridge-tied load (BTL) operation in battery-powered
applications. It is supplied in a very small 24-pin TSSOP thermal
surface-mount package designed to operate from low supply voltages
(betweenapproximately4.5Vand5.5V). Typicalapplicationsincludeportable
computers and multimedia systems.
The IC includes two separate amplifier channels, each of which can operate
in either the bridged-tied load (BTL) mode or the single-ended mode as
selected by the SE/BTL pin. In the BTL mode, the line inputs are automatically
selected and the two output lines of each channel operate as mirror images
of each other for increased power. The speaker load is connected directly
across OUT+ and OUT–, and neither line is connected to ground. BTL
operation provides many benefits, including quadruple the output power of
single-ended operation and no need for bulky output coupling capacitors.
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The TPA6011A4 Audio Power Amplifier Evaluation Module
In the single-ended mode, the headphone inputs are automatically selected
and the speaker load is connected between the OUT+ terminal, through an
output coupling capacitor, to system ground. For more information, see the
TPA6011A4 amplifier IC data sheet, TI literature number SLOS392.
Figure 3–4. TPA6011A4 Amplifier IC
L HP
MUX
L IN+
L LINE–
SEDIFF
VOLUME
SEMAX
VOLUME
CONTROL
FADE
R LINE–
R IN+
MUX
R HP
SE/BTL
HP/LINE
3.2.2 Inputs and Gain
Each channel has two separate signal inputs, line and headphone (HP), that
are automatically selected with the output mode (SE/BTL). An input
multiplexor in the amplifier IC selects the HP inputs when the IC is in the SE
output mode and the line inputs when in the BTL output mode.
Line and headphone inputs share common positive inputs. If using separate
line and headphone inputs, R IN+ and L IN+ should be ac-grounded through
a capacitor. If using differential inputs, line and headphone inputs must be the
same.
3.2.3 Volume Control
Potentiometer R5 adjusts the gain of the amplifier when the amplifier is in BTL
mode (a logic low on the SE/BTL pin). Turning the potentiometer clockwise
increases the voltage on the VOLUME terminal (pin 21), resulting in a higher
volume. Turning the potentiometer counter-clockwise decreases the voltage
on the VOLUME terminal (pin 21), resulting in a lower volume. Table 3–1 lists
the corresponding gain for the voltage applied to the VOLUME terminal. The
voltages listed in the table are for V
= 5 V. For a different V , the values
DD
DD
in the table scale linearly. If V
4 V/5 V, or 0.8.
= 4 V, multiply all the voltages in the table by
DD
The TPA6011A4 allows the user to specify a difference between BTL gain and
SE gain. When switching to SE mode (a logic high on the SE/BTL pin), the
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The TPA6011A4 Audio Power Amplifier Evaluation Module
SEDIFFandSEMAXpinscontrolthesinge-endedgainproportionaltothegain
set by the voltage on the VOLUME pin. When SEDIFF = 0 V, the difference
between the BTL gain and the SE gain is 6 dB. The voltage on the SEDIFF
terminal is subtracted from the voltage on the VOLUME terminal and the value
is used to determine the SE gain. Turning the potentiometer R6 in the clock-
wise direction decreases the voltage on the SEDIFF terminal, resulting in a
higher volume in the single-ended mode of operation. The voltage on the SE-
DIFF terminal is subtracted from the voltage on the VOLUME terminal and the
value is used to determine the SE gain.
TheSEMAXterminalcontrolsthemaximumgainforsingleendedmode. Turn-
ing potentiometer R7 in the clockwise direction increases the voltage on the
SEMAX terminal, resulting in a higher volume limit for single-ended operation.
The functionality of the SEDIFF and SEMAX pin are combined to set the SE
gain. A block diagram of the combined functionality is shown in Figure 3–5.
The value obtained from the block diagram for SE_VOLUME is a dc voltage
thatcanbeusedtodeterminetheSEgainusingTable3–2. Again, thevoltages
listed in the table are for V
voltages.
= 5 V. The values must be scaled for other V
DD
DD
Figure 3–5. Block Diagram of SE Volume Control
SEDIFF (V)
SEMAX (V)
–
VOLUME–SEDIFF
Is SEMAX>
(VOLUME–SEDIFF)?
VOLUME (V)
+
NO
SE_VOLUME (V) = VOLUME (V) – SEDIFF (V)
YES
SE_VOLUME (V) = SEMAX (V)
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The TPA6011A4 Audio Power Amplifier Evaluation Module
Table 3–1. DC Volume Control (BTL Mode, V
= 5 V)
DD
VOLUME (PIN 21)
GAIN OF AMPLIFIER
(dB)
FROM (V)
TO (V)
0.26
0.37
0.48
0.59
0.70
0.82
0.93
1.04
1.16
1.27
1.38
1.49
1.60
1.72
1.83
1.94
2.06
2.17
2.28
2.39
2.50
2.61
2.73
2.83
2.95
3.06
3.17
3.29
3.40
3.51
3.63
5.00
0.00
0.33
0.44
0.56
0.67
0.78
0.89
1.01
1.12
1.23
1.35
1.46
1.57
1.68
1.79
1.91
2.02
2.13
2.25
2.36
2.47
2.58
2.70
2.81
2.92
3.04
3.15
3.26
3.38
3.49
3.60
3.71
–85
–40
–38
–36
–34
–32
–30
–28
–26
–24
–22
–20
–18
–16
–14
–12
–10
–8
–6
–4
–2
0
2
4
6
8
10
12
14
16
18
20
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The TPA6011A4 Audio Power Amplifier Evaluation Module
Table 3–2. DC Volume Control (SE Mode, V
= 5 V)
DD
SE_VOLUME(V) = VOLUME(V) – SEDIFF(V) or SEMAX(V)
GAIN OF AMPLIFIER
(dB)
FROM (V)
0.00
0.33
0.44
0.56
0.67
0.78
0.89
1.01
1.12
1.23
1.35
1.46
1.57
1.68
1.79
1.91
2.02
2.13
2.25
2.36
2.47
2.58
2.70
2.81
2.92
3.04
3.15
3.26
3.38
3.49
3.60
3.71
TO (V)
0.26
0.37
0.48
0.59
0.70
0.82
0.93
1.04
1.16
1.27
1.38
1.49
1.60
1.72
1.83
1.94
2.06
2.17
2.28
2.39
2.50
2.61
2.73
2.83
2.95
3.06
3.17
3.29
3.40
3.51
3.63
5.00
–85
–46
–44
–42
–40
–38
–36
–34
–32
–30
–28
–26
–24
–22
–20
–18
–16
–14
–12
–10
–8
–6
–4
–2
†
0
2
4
6
8
10
12
14
3.2.4 Differential Input
TheTPA6011A4lineinputsallowtheuseofasingle-endedordifferentialaudio
source. The differential input stage of the amplifier cancels any noise that
appears on both input lines of a channel. To use the TPA6011A4 EVM with a
differentialsource, connectthepositiveleadoftheaudiosourcetotheRLINE–
(L LINE–) input and the negative lead from the audio source to the R IN+
(L IN+) input. To use the TPA6011A4 with a single-ended source, ac-ground
the R IN+ and L IN+ inputs and apply the audio signal to the R LINE– and L
LINE– inputs. Line and headphone inputs share common positive inputs. If
using separate line and headphone inputs, R IN+ and L IN+ should be
ac-grounded. If using differential inputs, line and headphone inputs must be
the same. In a single-ended input application, the R IN+ and L IN+ inputs
should be ac-grounded at the audio source instead of at the device inputs for
best noise performance.
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The TPA6011A4 Audio Power Amplifier Evaluation Module
3.2.5 Depop Circuitry
The TPA6011A4 amplifier IC contains internal circuitry to minimize the various
transients that might appear at the output during the transition from power off
or shutdown to normal operation, or when transitioning between the SE and
BTL modes.
3.2.6 BTL Operation
To operate in the bridge-tied load output mode, the module SE/BTL control
input terminal must be held low. The module output signal from OUT+ must go
throughthespeakerloadandbereturneddirectlytoOUT–, andNOTtosystem
ground. This requires that the OUT– line be isolated not only from system
ground, but also from the OUT– lines of any other amplifiers in the system. The
platform provides such isolated output lines from the amplifier EVM sockets
directly to separate left and right speaker connectors.
3.2.7 Single-Ended Operation
For single-ended operation, the module SE/BTL control input pin must be held
high. The speaker (or headphone) load is connected to the module OUT+
output pin through a coupling capacitor, and to platform/system ground. A
470-µF electrolytic coupling capacitor is provided on the platform in the signal
path to the headphone output jack for this purpose, and a control signal from
the platform headphone jack can be routed to the module control input pin to
switch the TPA6011A4 IC to the single-ended mode.
In the single-ended mode, the amplifiers inside the TPA6011A4 IC that drive
the OUT– lines do not operate and do not dissipate any power. The OUT– pins
go into a high-impedance state and can be left connected or allowed to float.
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Using the TPA6011A4 EVM With the Plug-N-Play Evaluation Platform
3.3 Using the TPA6011A4 EVM With the Plug-N-Play Evaluation Platform
The TPA6011A4 audio amplifier evaluation module was designed to be used
with the TI plug-n-play audio amplifier evaluation platform. It simply plugs into
socket U2.
The following paragraphs provide additional details for using the TPA6011A4
EVM with the platform.
3.3.1 Installing and Removing EVM Boards
TI plug-n-play evaluation modules use single-in-line header pins installed on
the underside of the module circuit board to plug into sockets on the platform.
The EVM pins and the platform sockets are keyed such that only the correct
type of EVM can be installed in a particular socket, and then only with the
proper orientation.
Evaluation modules are easily removed from the platform by simply prying
them up and lifting them out of their sockets. Care must be taken, however, to
prevent bending the pins.
3.3.1.1 EVM Insertion
1) Remove all power from the evaluation platform.
2) Locate socket U2 on the platform.
3) Orient the module correctly.
4) Carefully align the pins of the module with the socket pin receptacles.
5) Gently press the module into place.
6) Check to be sure that all pins are seated properly and that none are bent
over.
3.3.1.2 EVM Removal
1) Remove all power from the evaluation platform.
2) Gently pry up one side of the module a small amount.
3) Change to the opposite side of the module and use the tool to pry that side
up a small amount.
4) Alternate between sides, prying the module up a little more each time to
avoid bending the pins, until it comes loose from the socket.
5) Lift the EVM off the platform.
3.3.2 TPA6011A4 Module Jumper Settings and Switches
The TPA6011A4 EVM is equipped with a pushbutton SPST switch and a
jumper that acts as an SPST switch to allow module operation to be modified
to suit various requirements. In the following discussion, setting a jumper to
ON means that a shunt is installed across the two pins of the jumper. Setting
a jumper to OFF means that no shunt is installed on the jumper (see
Figure 3–6).
In typical applications, some or all of the jumper functions are controlled by the
system microcontroller or external logic.
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Using the TPA6011A4 EVM With the Plug-N-Play Evaluation Platform
Figure 3–6. TPA6011A4 EVM Jumpers and Switches
ROUT–
24
ROUT+
ROUT+
V
DD
1
2
GND
PGND
J1
R1
100 kΩ
23
22
C11
10 µF
C10
0.47 µF
ROUT–
SE/BTL
SE/BTL
J3
HP/LINE
HP/LINE
J2
3
R2
100 kΩ
PV
DD
C1
0.47 µF
V
4
DD
21
R HP
R LINE–
R IN
RHPIN
RLINEIN
RIN
VOLUME
SEDIFF
VOL
C2
0.47 µF
V
20
DD
DD
DD
5
C3
0.47 µF
V
19
6
SEMAX
AGND
C7
0.47 µF
V
DD
V
18
7
V
DD
GND
C8
0.47 µF
C4
0.47 µF
8
17
L IN
L LINE–
L HP
LIN
BYPASS
C5
V
DD
0.47 µF
J4
R3
100 kΩ
9
LLINEIN
LHPIN
C6
0.47 µF
16
15
FADE
FADE
SDZ
10
11
12
SHUTDOWN
R4
S1
100 kΩ
DD
V
DD
PV
DD
V
14
13
C9
0.47 µF
LOUT+
PGND
LOUT+
GND
LOUT–
LOUT–
3.3.2.1 S1 — Shutdown Switch
Pushbutton switch S1 on the EVM allows the manual shutdown of the
TPA6011A4 amplifier IC.
3.3.2.2 J1 — Output Mode Jumper
To keep the module amplifier IC in the single-ended output mode regardless
of the module control input state, set jumper J1 to ON.
Jumper J1 connects the SE/BTL output mode control input pin on the amplifier
IC directly to V , so that when J1 is ON, the IC is held in the single-ended
DD
output mode regardless of the state of the SE/BTL module control input. When
J1 is OFF, a pulldown resistor on the module holds the IC output mode control
input pin low, keeping the IC in the BTL output mode.
The TPA6011A4 amplifier IC has two separate inputs for each channel. An
internalmultiplexorselectswhichinputtoconnecttotheamplifierbasedonthe
state of the SE/BTL pin on the IC.
3-11
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Using the TPA6011A4 EVM With the Plug-N-Play Evaluation Platform
3.3.2.3 J2 — Input Mode Jumper
To force the module amplifier IC to use the HP input regardless of the module
control input state, set jumper J2 to ON.
Jumper J2 connects the HP/LINE input mode control pin on the amplifier IC
directly to V , so that when J2 is ON, the IC is held in the HP input mode
DD
regardless of the state of the HP/LINE module control input. When J2 is OFF,
apulldownresistoronthemoduleholdstheICinputcontrolmodeinputpinlow,
allowing the IC to use the LINE inputs as the source of an input signal.
3.3.2.4 J3 — Input and Output Mode Jumper
To force the module amplifier IC to use the HP input when in SE output mode
and to use the LINE input when in BTL output mode, set jumper J3 to ON.
When jumper J3 is ON, the HP/LINE input mode control pin on the amplifier
IC and the SE/BTL output mode control pin on the amplifier IC are shorted
together so that both the input and output multiplexors switch simultaneously.
When J3 is OFF, the input and output modes may be switched independently
of each other.
3.3.2.5 J4 — Fade Mode Jumper
A fade mode slowly ramps up the amplifier gain when coming out of shutdown
mode and conversely ramps the gain down when going into shutdown. This
mode provides a smooth transition between the active and shutdown states
and virtually eliminates any pops or clicks on the outputs.
Jumper J4 connects the FADE input control pin on the amplifier IC directly to
GND, so that when J4 is ON, the IC is held in fade mode and the gain slowly
ramps when entering/leaving the shutdown state. When J4 is OFF, a pullup
resistor on the module holds the FADE input at V and the amplifier switches
DD
to non-fade mode.
3.3.3 Signal Routing
Signal flow on the platform is controlled by two signal routing switches, as
shown in Figure 3–7.
Figure 3–7. Platform Signal Routing and Outputs
Off
+
R
R
L
R
–
U2
J7, J8, J9
Speaker
Outputs
U1
Signal
Conditioning
TPA6011A4
Amplifier EVM
Audio
Input
S2
–
L
+
L
On
U2–U4
R
+
R
U5
Stereo
Headphone
Amplifier
–
J10
Headphone
Output
GND
S3
L
–
+
L
U5
3-12
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Using the TPA6011A4 EVM With the Plug-N-Play Evaluation Platform
3.3.3.1 Signal Conditioning
The audio signal from the input jacks can be applied to the signal conditioning
socket (U1) if an EVM is installed there, or socket U1 can be bypassed and the
audio input signal applied directly to the inputs of the TPA6011A4.
- Switch S2 selects signal conditioning or bypasses it.
3.3.3.2 Headphone Output Jack
Switch S3 is the source select for the stereo headphone output jack, J10. The
headphone jack is capacitively coupled (via 470-µF electrolytics) and can
output either the signal from the headphone amplifier in socket U5, or the
signal from the TPA6011A4 power amplifier installed in socket U2, as
determined by the setting of headphone source select switch S3.
When S3 is set to the power amplifier position (U2 – U4), the headphone jack
is connected to the TPA6011A4 power amplifier OUT+ output lines. When a
plug is inserted into the jack, signals output through J10 are returned to
platform ground, requiring single-ended power amplifier operation. A switch
inside the headphone jack produces a control signal that can be routed to the
power amplifier socket to shut down the TPA6011A4 EVM or switch it to
single-ended output mode when a plug is inserted.
Source select switch S3 connects the headphone jack to the output lines of
either the headphone amplifier socket U5, or the power amplifier sockets
(U2 – U4).
- To keep the TPA6011A4 amplifier outputs separated, set switch S3 to the
headphone amplifier position (U5) and use the speaker outputs (J7, J8,
and J9).
- To route the TPA6011A4 amplifier outputs to the headphone output jack
(J10), set switch S3 to the power amplifier position (U2 – U4). Uuse this
setting only if the TPA6011A4 EVM is to drive single-ended loads con-
nected to J10.
3.3.4 Mute (Shutdown)/Mode
TheTPA6011A4EVMisequippedwithashutdowncontrolinputpin. Whenthis
input is pulled to ground, the TPA6011A4 amplifier IC on the module enters the
shutdown mode and dissipates very little power. While in the shutdown mode,
the PC BEEP input is still active. When the EVM control input is tied to GND
or allowed to float, normal amplifier operation resumes.
In typical applications, as often found in notebook computers, portable audio
products, and such, the internal speakers mute when headphones are
plugged into the headphone jack, or internal speakers mute when external
speakers are connected. In applications using separate speaker and
headphone amplifiers, the one not being used can be shut down to conserve
power.
A mode control input pin on the EVM switches the TPA6011A4 amplifier IC
between the bridge-tied load (BTL) output mode and the single-ended (SE)
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Using the TPA6011A4 EVM With the Plug-N-Play Evaluation Platform
outputmode. WhenthemodecontrolinputistiedtoGND, themoduleoperates
in the BTL output mode. When this input is tied to V , the module operates
DD
in the single-ended output mode.
In the typical application, output mode switching allows the TPA6011A4 to
operate in the BTL output mode for increased power to internal speakers and
then switch to single-ended mode to drive headphones when a plug is inserted
into the headphone jack.
3.3.4.1 Headphone Jack Control Signals
The platform headphone output jack (J10) contains an internal switch that
changes the state of a pair of control lines when a plug is inserted (see
Figure 3–8). Each control line is pulled down by a 1-kΩ resistor to ground (R4
and R5). The switch in the headphone jack pulls one line or the other up to V
DD
through a 240-Ω resistor (R3) depending on whether a plug is inserted in J10
or not.
Figure 3–8. Mute/Mode and Polarity Control
V
DD
R3
240 Ω
Polarity
JP8
JP6
Mode
Mute
Lo
U2
Power
Amplifier
J10
Headphone
Jack
Hi
R4
1 kΩ
R5
1 kΩ
SPK
(U2–U4)
3.3.4.2 Mute/Mode Select (JP6)
A 3-pin jumper header (JP6) on the platform, functioning as an SPDT switch,
routes the control signal from the headphone jack to either the shutdown
control input pin or the mode control input pin of the evaluation module.
- To shut down the TPA6011A4 amplifier module using the control signal
from the platform headphone jack, jumper JP6 to MUTE.
- To switch the output mode of the TPA6011A4 amplifier between BTL and
single-ended using the control signal from the platform headphone jack,
jumper JP6 to MODE.
3.3.4.3 Mute/Mode Polarity Select (JP8)
A second 3-pin jumper header (JP8) on the platform selects the control signal
polarity by connecting either the active-high or the active-low line from the
headphone jack to jumper JP6.
- When JP6 is set to mute, use the following JP8 settings for the
TPA6011A4:
J
J
ToshutdowntheTPA6011A4amplifiermodulewhenaplugisinserted
into the headphone jack, jumper JP8 to Lo (this is the typical setting).
To shut down the TPA6011A4 amplifier module until a plug is inserted
into the headphone jack, jumper JP8 to Hi.
3-14
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Power Requirements
- When JP6 is set to mode, use the following JP8 settings for the
TPA6011A4:
J
To switch the TPA6011A4 amplifier module to the single-ended output
mode when a plug is inserted into the headphone jack, jumper JP8 to
Hi (this is the typical setting).
J
To switch the TPA6011A4 amplifier module to the BTL output mode
when a plug is inserted into the headphone jack, jumper JP8 to Lo.
3.3.5 Power Requirements
The TPA6011A4 audio power amplifier evaluation module can operate from
any voltage between approximately 4.5 V and 5.5 V; however, the TPA6011A4
amplifier IC on the module is characterized for operation at 5 V. For best
performance (highest output power with lowest distortion), the module should
be operated at approximately 5 V unless there is a specific reason for
operating it from a different voltage.
The TI plug-n-play audio amplifier evaluation platform with a voltage regulator
EVM installed on it can provide a regulated V
supply from a wide variety of
DD
unregulated V
voltage inputs between approximately 5.5 V and 12 V,
CC
including an onboard 9-V battery. Or, an external regulated power source can
be used to supply V voltage to the platform and the TPA6011A4 evaluation
DD
module installed on it.
Although the TPA6011A4 amplifier IC draws approximately 0.65 A from the
power supply during continuous full power output, peak current draw can be
as high as 1 A. Any power supply connected to the platform should be capable
of providing 1 A of current to avoid clipping of the output signal during peaks.
Current consumption driving speakers at normal listening levels is typically
0.3 A or less.
The platform is equipped with overvoltage and reverse-polarity supply voltage
input protection in the form of fused crowbar circuits.
- V
DD
voltage applied to platform screw terminals J6 MUST NOT exceed
the absolute maximum rating for the TPA6011A4 amplifier IC installed on
the evaluation module (6 V) or damage to the IC may result. In no case
shouldV voltageoftheincorrectpolarityorinexcessof6.1Vbeapplied
DD
to screw terminals J6 of the platform, or the power protection circuit on the
V
line is tripped.
DD
- V
voltage applied to the platform MUST NOT exceed the maximum
CC
voltage input specified for the voltage regulator module installed in socket
U6 (12 V for the SLVP097), or damage to the voltage regulator module
may result. In no case should V
voltage applied to the platform exceed
CC
15 V, or the overvoltage protection circuit on the V
bus is tripped.
CC
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Inputs and Outputs
3.3.6 Inputs and Outputs
The TI plug-n-play audio amplifier evaluation platform is equipped with several
standard conectors for audio inputs and outputs.
3.3.6.1 Inputs
In most cases, audio signals enter the platform through either a pair of RCA
phono jacks (J3 and J5) or a miniature (1/8 inch) stereo phone jack (J4).
Certain signal conditioning and amplifier EVMs, however, may have additional
signal input connectors mounted on the module circuit board. The TPA6011A4
EVM has a special PC BEEP signal input pin (TP2) on the top of the module
PCB.
The platform audio signal input jacks (J3, J4, and J5) are of the closed-circuit
type, grounding the signal input lines when no plugs are inserted.
3.3.6.2 Outputs
Amplified audio output signals leave the platform through left and right RCA
phono jacks (J7 and J9), left and right pairs of compression connectors for
stripped speaker wires (J8), and optionally, through a miniature (1/8 inch)
stereo phone jack (J10), for headphones.
The audio output lines from the power amplifiers are separate all the way to
the edge of the platform (output jacks J7, J8, and J9). The OUT– lines from the
power amplifier sockets are not tied to each other or to platform ground. This
allows the TPA6011A4 power amplifier EVM to operate in the highly-efficient
bridge-tied load configuration when driving speakers.
The headphone jack (J10) is capacitively coupled to source select switch S3,
which connects J10 to the output lines of either the headphone amplifier
socket or the power amplifier sockets (see Figure 3–6). When the TPA6011A4
output signal is routed to J10 by S3, signals output via J10 are returned to
platform ground when a plug is inserted (see Figure 3–8), requiring
single-ended operation of the power amplifiers.
Figure 3–9. Typical Headphone Plug
Left
Right
GND
3-16
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Using the TPA6011A4 EVM Stand-Alone
3.4 Using the TPA6011A4 EVM Stand-Alone
Using the TPA6011A4 audio power amplifier evaluation module stand-alone
is much the same as using it with the platform. The same 4.5-V to 5.5-V power
supply range and the isolated OUT+ and OUT– lines for BTL operation
requirement exists.
Note that the shutdown signal applied to the EVM SHUTDOWN pin must be
able to supply enough current to overcome the pullup resistor on the module
(100 kΩ).
3.4.1 TPA6011A4 EVM Connected for BTL Output
Figure 3–10. TPA6011A4 EVM Connected for Stereo BTL Output
Right
Audio
Input
(Right)
External Shut
Down Control
(active low)
Audio
Input
(Left)
Left
5 V
Table 3–3. Typical TPA6011A4 EVM Jumper Settings for BTL Stand-Alone
EVM
S3
OFF
TPA6011A4
Note: ON = Shunt installed
OFF = Open
3-17
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Using the TPA6011A4 EVM Stand-Alone
3.4.2 TPA6011A4 EVM Connected for Single-Ended Output
Figure 3–11. TPA6011A4 EVM Connected for Stereo Single-Ended Output
Audio
Input
(Right)
33 µF –
1000 µF
+
33 µF –
1000 µF
+
Audio
Input
(Left)
5 V
Table 3–4. Typical TPA6011A4 EVM Jumper Settings for Single-Ended Stand-Alone
EVM
J1
J2
J3
J4
TPA6011A4
OFF
OFF
ON
OFF
Note: ON = Shunt installed
OFF = Open
3-18
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Chapter 4
Reference
The TPA6011A4 EVM board layers, board schematic, and parts list are pres-
ented in this chapter.
Topic
Page
4.1 TPA6011A4 EVM Layers and Board Schematic . . . . . . . . . . . . . . . . . . 4-2
4.2 TPA6011A4 EVM Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
4-1
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TPA6011A4 EVM Layers and Board Schematic
4.1 TPA6011A4 EVM Layers and Board Schematic
Figure 4–1. TPA06011A4 EVM Top View
Figure 4–2. TPA06011A4 EVM Bottom View
4-2
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TPA6011A4 EVM Layers and Board Schematic
Figure 4–3. TPA06011A4 EVM Schematic Diagram
ROUT–
24
ROUT+
ROUT+
V
DD
1
GND
PGND
J1
R1
100 kΩ
2
3
23
C11
C10
ROUT–
SE/BTL
SE/BTL
22
21
10 µF
0.47 µF
J3
HP/LINE
HP/LINE
J2
R2
100 kΩ
PV
DD
C1
0.47 µF
V
4
DD
R HP
R LINE–
R IN
RHPIN
RLINEIN
RIN
VOLUME
SEDIFF
VOLUME
C2
0.47 µF
V
20
DD
DD
DD
5
C3
0.47 µF
V
19
6
SEMAX
AGND
C7
V
DD
V
18
0.47 µF
7
V
DD
GND
C8
0.47 µF
C4
0.47 µF
8
17
L IN
L LINE–
L HP
LIN
BYPASS
C5
0.47 µF
V
DD
J4
R3
9
LLINEIN
LHPIN
100 kΩ
C6
16
15
0.47 µF
FADE
FADE
SDZ
10
11
12
SHUTDOWN
R4
S1
100 kΩ
V
DD
PV
DD
V
DD
14
13
C9
0.47 µF
LOUT+
PGND
LOUT+
GND
LOUT–
LOUT–
4-3
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TPA6011A4 EVM Parts List
4.2 TPA6011A4 EVM Parts List
Table 4–1.TPA6011A4 EVM Parts List
EVM
Qty.
Manufacturer/
Part Number
Reference
Description
Size
Digi-Key Number
C1, C2, C3,
C4, C5, C6,
C7, C8, C9,
C10
Capacitor, 0.47 µF, 16 V,
80%/–20%, nonpolarized,
SMD
0805
10
Murata
GRM40-Y5V474Z16
Arrow
GRM40-Y5V474Z
016
C11
Capacitor, 10 µF, 6.3 V,
A
1
4
3
Panasonic
ECS-TOJY106R
Digi-Key
PCS1106CT-ND
SMD
R1, R2, R3,
R4
Resistor, 100 kΩ, 1/10 W,
5%, SMD
0805
Panasonic
ERJ-6GEYJ104V
Digi-Key
P100KATR-ND
R5, R6, R7
Potentiometer, 50 kΩ,
Cermet ST SL, through
hole
Bourns
3362P–1–503
Digi-Key
3362P–503–ND
S1
Switch, momentary, SMD,
low profile
1
4
Panasonic
EVQ-PPBA25
Digi-Key
P8086SCT-ND
J1, J2, J3, J4 Header, 2 position
2 mm
1/2 in
Norcomp
2163-2-01-P2
Digi-Key
2163S-02-ND
P1, P2, P3,
P4
Shunts, terminal posts,
0.100 in centers,
23
Sullins or SAMTEC
PTC36SABN or
TSW-19-8-G-S
Digi-Key
S1022-36-ND
U1
IC, TPA6011A4, audio
amplifier, 2 W, 2 channel
MUX, SMD, 24-PIN
PowerPad TSSOP
24 pin
TSSOP
1
TI
TPA6011A4PWP
4-4
Reference
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