FEATURES
ꢀ
High efficiency: 87.5% @ 1.8V/ 12A
ꢀ
Size: 47.2mm x 29.5mm x 8.5mm
(1.86" x 1.16" x 0.33")
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
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Low profile: 0.33"
Industry standard footprint and pin out
Surface mountable
Fixed frequency operation
Input UVLO, Output OCP, OVP, OTP
No minimum load required
2:1 input voltage range
Basic insulation
2250 isolation
ISO 9001, TL 9000, ISO 14001, QS9000,
OHSAS18001 certified manufacturing facility
UL/cUL 60950 (US & Canada) recognized,
and TUV (EN60950) certified
ꢀ
Delphi Series S24SA, 2”x1” Family
DC/DC Power Modules: 18~36Vin, 1.8V, 12A out
OPTIONS
ꢀ
Positive on/off logic
The Delphi Series S24SA, surface mountable, 24V input, single output,
isolated DC/DC converter is the latest offering from a world leader in
power system and technology and manufacturing -- Delta Electronics, Inc.
This product family provides up to 36 watts of power or up to 12A of
output current (for output voltage 1.8V or below) in a low profile 2”x1”
industry standard form factor and pinout. The S24SA operates from a
wide input range of 18V to 36V, output ranges from 1.2V to 12V. For 1.8V
at 12A full load, the efficiency is up to 87.5%. With creative design
technology and optimization of component placement, these converters
possess outstanding electrical and thermal performance, as well as
extremely high reliability under highly stressful operating conditions. All
models are protected from abnormal input/output voltage and current
conditions, and feature 2250V input/output isolation and basic insulation.
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SMD or Through hole mounting
APPLICATIONS
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Telecom/DataCom
Wireless Networks
Optical Network Equipment
Server and Data Storage
Industrial/Test Equipment
DATASHEET
DS_S24SA1R812_05092006
Delta Electronics, Inc.
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ELECTRICAL CHARACTERISTICS CURVES
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
95
18Vin
24Vin
36Vin
18Vin
24Vin
36Vin
90
85
80
75
70
65
60
55
50
0.1
2
4
6
8
10
12
0.1
2
4
6
8
10
12
OUTPUT CURRENT(A)
OUTPUT CURRENT (A)
Figure 1: Efficiency vs. load current for minimum, nominal, and
Figure 2: Power dissipation vs. load current for minimum,
maximum input voltage at 25°C.
nominal, and maximum input voltage at 25°C.
1.60
Io=12A
Io=7.2A
Io=1.2A
1.40
1.20
1.00
0.80
0.60
0.40
0.20
0.00
15
20
25
30
35
INPUT VOLTAGE (V)
Figure 3: Typical input characteristics at room temperature.
Figure 4: Turn-on transient at full rated load current (2 ms/div).
Top Trace: Vout (1V/div); Bottom Trace: ON/OFF Control
(5V/div).
3
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DS_S24SA1R812_05092006
ELECTRICAL CHARACTERISTICS CURVES
Figure5: Turn-on transient at zero load current (2 ms/div). Top
Trace: Vout (1mV/div); Bottom Trace: ON/OFF Control
(5V/div).
Figure 6: Output voltage response to step-change in load
current (50%-75% of Io, max; di/dt = 0.1A/µs). Load cap: 10µF,
100 mΩESR tantalum capacitor and 1µF ceramic capacitor.
Top Trace: Vout (50mV/div), Bottom Trace: Iout (5A/div).
is
Vi (+)
Cs : 220uF
ESR < 0.1Ω
@20℃ 100KHZ
Cs :100uF
ESR < 0.5Ω
@20℃ 100KHZ
Vi (-)
Figure 7: Output voltage response to step-change in load
current (75%-50% of Io, max; di/dt = 0.1A/µs). Load cap:
10µF, 100 mΩESR tantalum capacitor and 1µF ceramic
capacitor.
5A/div).
Figure 8: Test set-up diagram showing measurement points
for Input Reflected Ripple Current (Figure 9).
Note: Measured input reflected-ripple current with a simulated
source Inductance (LTEST) of 12 µH. Capacitor Cs offset
possible battery impedance.
Top Trace: Vout (50mV/div), Bottom Trace: Iout
4
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DS_S24SA1R812_05092006
ELECTRICAL CHARACTERISTICS CURVES
Copper Strip
Vo(+)
Vo(-)
SCOPE
RESISTIVE
LOAD
10u
1u
Figure 10: Output voltage noise and ripple measurement test
setup. Scope measurement should be made using a BNC
cable (length shorter than 20 inches). Position the load
between 51 mm to 76 mm (2 inches to 3 inches) from the
module.
Figure 9: Input Reflected Ripple Current, i , at full rated output
current and nominal input voltage with 12µH source impedance
and 100µF electrolytic capacitor (2 mA/div).
s
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
Vin=24V
0.0
5.0
10.0
15.0
20.0
LOAD CURRENT (A)
Figure 11: Output voltage ripple at nominal input voltage and
rated load current (10 mV/div). Load capacitance: 1µF ceramic
capacitor and 10µF tantalum capacitor. Bandwidth: 20 MHz.
Figure 12: Output voltage vs. load current showing typical
current limit curves and converter shutdown points.
5
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DS_S24SA1R812_05092006
DESIGN CONSIDERATIONS
This power module is not internally fused. To achieve
optimum safety and system protection, an input line
fuse is highly recommended. The safety agencies
require a normal-blow fuse with 5A maximum rating to
be installed in the ungrounded lead. A lower rated fuse
can be used based on the maximum inrush transient
energy and maximum input current.
Input Source Impedance
The impedance of the input source connecting to the
DC/DC power modules will interact with the modules
and affect the stability. A low ac-impedance input
source is recommended. If the source inductance is
more than a few µH, we advise adding a 10 to 100 µF
electrolytic capacitor (ESR < 0.7 Ω at 100 kHz)
mounted close to the input of the module to improve the
stability.
Soldering and Cleaning Considerations
Post solder cleaning is usually the final board assembly
process before the board or system undergoes
electrical testing. Inadequate cleaning and/or drying
may lower the reliability of a power module and
severely affect the finished circuit board assembly test.
Adequate cleaning and/or drying is especially important
for un-encapsulated and/or open frame type power
modules. For assistance on appropriate soldering and
cleaning procedures, please contact Delta’s technical
support team.
Layout and EMC Considerations
Delta’s DC/DC power modules are designed to operate
in a wide variety of systems and applications. For
design assistance with EMC compliance and related
PWB layout issues, please contact Delta’s technical
support team. An external input filter module is
available for easier EMC compliance design.
Application notes to assist designers in addressing
these issues are pending release.
Safety Considerations
The power module must be installed in compliance with
the spacing and separation requirements of the end-
user’s safety agency standard if the system in which the
power module is to be used must meet safety agency
requirements.
When the input source is 60Vdc or below, the power
module meets SELV (safety extra-low voltage)
requirements. If the input source is a hazardous voltage
which is greater than 60 Vdc and less than or equal to
75 Vdc, for the module’s output to meet SELV
requirements, all of the following must be met:
ꢀ
The input source must be insulated from any
hazardous voltages, including the ac mains, with
reinforced insulation.
ꢀ
ꢀ
ꢀ
One Vi pin and one Vo pin are grounded, or all the
input and output pins are kept floating.
The input terminals of the module are not operator
accessible.
A SELV reliability test is conducted on the system
where the module is used to ensure that under a
single fault, hazardous voltage does not appear at
the module’s output.
Do not ground one of the input pins without grounding
one of the output pins. This connection may allow a
non-SELV voltage to appear between the output pin
and ground.
6
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DS_S24SA1R812_05092006
FEATURES DESCRIPTIONS
Vi(+)
Vo(+)
Over-Current Protection
Sense(+)
ON/OFF
Sense(-)
The modules include an internal output over-current
protection circuit, which will endure current limiting for
an unlimited duration during output overload. If the
output current exceeds the OCP set point, the modules
will automatically shut down (hiccup mode).
Vi(-)
Vo(-)
The modules will try to restart after shutdown. If the
overload condition still exists, the module will shut down
again. This restart trial will continue until the overload
condition is corrected.
Figure 13: Remote on/off implementation
Remote Sense (Optional)
Remote sense compensates for voltage drops on the
output by sensing the actual output voltage at the point of
load. The voltage between the remote sense pins and the
output terminals must not exceed the output voltage sense
range given here:
Over-Voltage Protection
The modules include an internal output over-voltage
protection circuit, which monitors the voltage on the
output terminals. If this voltage exceeds the over-
voltage set point, the module will shut down (Hiccup
mode). The modules will try to restart after shutdown. If
the fault condition still exists, the module will shut down
again. This restart trial will continue until the fault
condition is corrected.
[Vo(+) – Vo(–)] – [SENSE(+) – SENSE(–)] ≤ 10% × Vout
This limit includes any increase in voltage due to remote
sense compensation and output voltage set point
adjustment (trim).
Over-Temperature Protection
Vi(+) Vo(+)
Sense(+)
The over-temperature protection consists of circuitry
that provides protection from thermal damage. If the
temperature exceeds the over-temperature threshold
the module will shut down.
Sense(-)
The module will try to restart after shutdown. If the over-
temperature condition still exists during restart, the
module will shut down again. This restart trial will
continue until the temperature is within specification.
Vi(-) Vo(-)
Contact
Resistance
Contact and Distribution
Losses
Figure 14: Effective circuit configuration for remote sense
operation
Remote On/Off
The remote on/off feature on the module can be either
negative or positive logic. Negative logic turns the
module on during a logic low and off during a logic high.
Positive logic turns the modules on during a logic high
and off during a logic low.
If the remote sense feature is not used to regulate the
output at the point of load, please connect SENSE(+) to
Vo(+) and SENSE(–) to Vo(–) at the module.
The output voltage can be increased by both the remote
sense and the trim; however, the maximum increase is the
larger of either the remote sense or the trim, not the sum of
both.
Remote on/off can be controlled by an external switch
between the on/off terminal and the Vi(-) terminal. The
switch can be an open collector or open drain.
When using remote sense and trim, the output voltage of
the module is usually increased, which increases the power
output of the module with the same output current.
For negative logic if the remote on/off feature is not
used, please short the on/off pin to Vi(-). For positive
logic if the remote on/off feature is not used, please
leave the on/off pin floating.
Care should be taken to ensure that the maximum output
power does not exceed the maximum rated power.
7
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DS_S24SA1R812_05092006
23.8(100 + ∆Vo%) −1089
∆Vo%
FEATURES DESCRIPTIONS (CON.)
Rtrim − up =
[
−104 ΚΩ
]
Output Voltage Adjustment (TRIM)
Ex. When trim-up +10% (1.8V X 1.1 = 1.98V)
To increase or decrease the output voltage set point, the
modules may be connected with an external resistor
between the TRIM pin and either the Vo+ or Vo -. The
TRIM pin should be left open if this feature is not used.
23.8(100 +10) −1089
Rtrim − up =
[
−104 = 48.9 ΚΩ
10
Care should be taken to ensure that the maximum
output power of the module remains at or below the
maximum rated power.
Figure 15: Circuit configuration for trim-down (decrease output
voltage)
If the external resistor is connected between the TRIM
and Vo- pins, the output voltage set point decreases.
The external resistor value required to obtain a
percentage of output voltage change △Vo% is defined
as:
1089
Rtrim − down =
−104
[
ΚΩ
]
∆Vo%
Ex. When trim-down –10% (1.8V X 0.9 = 1.62V)
1089
Rtrim − down =
[
−104 = 4.9 ΚΩ
]
10
Figure 16: Circuit configuration for trim-up (increase output
voltage)
If the external resistor is connected between the TRIM
and Vo+ pins, the output voltage set point increases.
The external resistor value required to obtain a
percentage output voltage change △Vo% is defined as:
8
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DS_S24SA1R812_05092006
THERMAL CURVES
THERMAL CONSIDERATIONS
Thermal management is an important part of the system
design. To ensure proper, reliable operation, sufficient
cooling of the power module is needed over the entire
temperature range of the module. Convection cooling is
usually the dominant mode of heat transfer.
Hence, the choice of equipment to characterize the
thermal performance of the power module is a wind
tunnel.
Thermal Testing Setup
Delta’s DC/DC power modules are characterized in
heated vertical wind tunnels that simulate the thermal
environments encountered in most electronics
equipment. This type of equipment commonly uses
vertically mounted circuit cards in cabinet racks in which
the power modules are mounted.
Figure 18: Hot spot temperature measured point
＊The allowed maximum hot spot temperature is defined at 110℃
S24SA1R812NR (Standard) Output Current vs. Ambient Temperature and Air Velocity
(Either Orientation)
Output Current(A)
The following figure shows the wind tunnel
characterization setup. The power module is mounted
on a test PWB and is vertically positioned within the
wind tunnel. The space between the neighboring PWB
and the top of the power module or a heat sink is
6.35mm (0.25”).
12
10
Natural
Convection
7
100LFM
200LFM
5
Thermal Derating
300LFM
400LFM
2
Heat can be removed by increasing airflow over the
module. The module’s maximum hot spot temperature is
110℃. To enhance system reliability, the power module
should always be operated below the maximum
operating temperature. If the temperature exceeds the
maximum module temperature, reliability of the unit may
be affected.
500LFM
0
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Figure 19: Output current vs. ambient temperature and air velocity
(Either Orientation)
PWB
MODULE
FACING PWB
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
50.8 (2.0”)
AIR FLOW
10 (0.4”)
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
Figure 17: Wind tunnel test setup figure
9
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PICK AND PLACE LOCATION
SURFACE-MOUNT TAPE & REEL
RECOMMENDED PAD LAYOUT (SMD)
10
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DS_S24SA1R812_05092006
LEADED (Sn/Pb) PROCESS RECOMMEND TEMP. PROFILE
Peak temp.
2nd Ramp-up temp.
210~230°C 5sec.
1.0~3.0°C /sec.
250
Pre-heat temp.
140~180°C 60~120 sec.
200
Cooling down rate <3°C /sec.
Ramp-up temp.
0.5~3.0°C /sec.
150
100
50
Over 200°C
40~50sec.
0
60
120
Time ( sec. )
180
240
300
Note: The temperature refers to the pin of S24SA, measured on the pin +Vout joint.
LEAD FREE (SAC) PROCESS RECOMMEND TEMP. PROFILE
.
Temp
Peak Temp. 240 ~ 245 ℃
217℃
200℃
Ramp down
max. 4℃/sec.
Preheat time
100~140 sec.
150℃
25℃
Time Limited 90 sec.
above 217℃
Ramp up
max. 3℃/sec.
Time
Note: The temperature refers to the pin of S24SA, measured on the pin +Vout joint.
11
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DS_S24SA1R812_05092006
MECHANICAL DRAWING
Surface-mount module
Through-hole module
Pin No.
Name
Function
1
2
6
8
11
12
+Vout
-Vout
Trim
ON/OFF
-Vin
Positive output voltage
Negative output voltage
Output voltage trim
ON/OFF logic
Negative input voltage
Positive input voltage
Function
+Vin
Name
Optional Pin
4
5
+Sense (Option)
-Sense (Option)
Positive sense pin
Negative sense pin
12
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DS_S24SA1R812_05092006
PART NUMBERING SYSTEM
S
24
Input
Voltage
24V
S
A
1R8
Output
Voltage Current
12
Output
N
R
F
A
Form
Factor
S- Small
Power
Number of
Outputs
S- Single
Product
Series
A- Advanced 1R2-1.2V 03- 3.0A
1R5-1.5V 06- 6.6A
1R8-1.8V 10- 10A
2R5-2.5V 12- 12A
3R3- 3.3V
ON/OFF
Logic
N- Negative R- SMD
P- Positive T- Through
hole
Pin Type
Option
Code
A－6 pins, no
F- RoHS 6/6
(Lead Free)
sense
B－8 pins, with
sense
050- 5.0V
120- 12.0V
MODEL LIST
MODEL NAME
INPUT
OUTPUT
EFF @ 100% LOAD
S24SA1R212NRFA
S24SA1R512NRFA
S24SA1R812NRFA
S24SA2R510NRFA
S24SA3R310NRFA
S24SA05006NRFA
S24SA12003NRFA
18V~36V
18V~36V
2.2A
2.2A
2.2A
3.2A
3.2A
3.2A
3.2A
1.2V
12A
85.5%
87.0%
87.5%
88.5%
90.0%
90.0%
89.5%
1.5V
1.8V
2.5V
3.3V
5.0V
12V
12A
12A
10A
10A
6.6A
3.0A
18V~36V
18V~36V
18V~36V
18V~36V
18V~36V
CONTACT: www.delta.com.tw/dcdc
USA:
Telephone:
East Coast: (888) 335 8201
West Coast: (888) 335 8208
Fax: (978) 656 3964
Asia & the rest of world:
Telephone: +886 3 4526107 ext 6220
Fax: +886 3 4513485
Europe:
Phone: +41 31 998 53 11
Fax: +41 31 998 53 53
Email: [email protected]
Email: [email protected]
Email: [email protected]
WARRANTY
Delta offers a two (2) year limited warranty. Complete warranty information is listed on our web site or is available upon
request from Delta.
Information furnished by Delta is believed to be accurate and reliable. However, no responsibility is assumed by Delta for
its use, nor for any infringements of patents or other rights of third parties, which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of Delta. Delta reserves the right to revise these
specifications at any time, without notice.
13
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