FEATURES
ꢀ
High efficiency: 90.5% @ 15V/4.4A
ꢀ
Size: 33.0 x 22.9 x 9.5 mm
(1.30”x0.90”x0.37”)
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Industry standard footprint and pinout
Fixed frequency operation
SMD and through-hole versions
Input UVLO and OVP
OTP and output OCP, OVP
Output voltage trim: -15%, +10%
Monotonic startup into normal and
pre-biased loads
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2250V isolation and basic insulation
No minimum load required
No negative current during power or
enable on/off
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ISO 9001, TL 9000, ISO 14001, QS 9000,
OHSAS18001 certified manufacturing
facility
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UL/cUL 60950 (US & Canada)
recognized, and TUV (EN60950) certified
CE mark meets 73/23/EEC and
93/68/EEC directive
Delphi Series V48SR, 1/16th Brick 66W
DC/DC Power Modules: 48V in, 15V, 4.4A out
The Delphi Series V48SR, 1/16th Brick, 48V input, single output, isolated
DC/DC converter, is the latest offering from a world leader in power
systems technology and manufacturing ― Delta Electronics, Inc. This
product family provides up to 66 watts of power or 25A of output current
(1.8V and below) in an industry standard 1/16th brick form factor (1.30” x
0.90”). The 15V output offers one of the highest output currents available
and provides up to 90.5% efficiency at full load. 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
modules are protected from abnormal input/output voltage, current, and
temperature conditions. For lower power needs with the 15V output, but
in a similar small form factor, please check out Delta S48SP (36W or
15V/2.3A) and S48SE (17W or 15V/1A) series standard DC/DC modules.
OPTIONS
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SMD pins
Positive remote On/Off
OTP and output OVP, OCP mode
(auto-restart or latch)
APPLICATIONS
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Optical Transport
Data Networking
Communications
Servers
DATASHEET
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ELECTRICAL CHARACTERISTICS CURVES
Figure 1: Efficiency vs. load current for minimum, nominal, and
maximum input voltage at 25°C
Figure 2: Power dissipation vs. load current for minimum,
nominal, and maximum input voltage at 25°C.
Figure 3: Typical full load input characteristics at room
temperature
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ELECTRICAL CHARACTERISTICS CURVES
For Negative Remote On/Off Logic
Figure 4: Turn-on transient at full rated load current (resistive
load) (5 ms/div). Vin=48V. Top Trace: Vout, 5.0V/div; Bottom
Trace: ON/OFF input, 2V/div
Figure 5: Turn-on transient at zero load current (5 ms/div).
Vin=48V. Top Trace: Vout: 5.0V/div, Bottom Trace: ON/OFF
input, 2V/div
For Positive Remote On/Off Logic
Figure 6: Turn-on transient at full rated load current (resistive
load) (5 ms/div). Vin=48V. Top Trace: Vout, 5.0V/div; Bottom
Trace: ON/OFF input, 2V/div
Figure 7: Turn-on transient at zero load current (5 ms/div).
Vin=48V. Top Trace: Vout, 5.0V/div; Bottom Trace: ON/OFF
input, 2V/div
TBD
Figure 8: Output voltage response to step-change in load
current (75%-50%-75% of Io, max; di/dt = 0.1A/µs). Load cap:
10µF tantalum capacitor and 1µF ceramic capacitor. Top Trace:
Vout (200mV/div, 200us/div), Bottom Trace: Iout (2A/div).
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: Output voltage response to step-change in load
current (75%-50%-75% of Io, max; di/dt = 2.5A/µs). Load cap:
470µF, 35mΩ ESR solid electrolytic capacitor and 1µF ceramic
capacitor. Top Trace: Vout (50mV/div, 200us/div), Bottom Trace:
Iout (5A/div). 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
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ELECTRICAL CHARACTERISTICS CURVES
Figure 10: Test set-up diagram showing measurement points
for Input Terminal Ripple Current and Input Reflected Ripple
Current.
Figure 11: Input Terminal Ripple Current, ic, at full rated output
current and nominal input voltage with 12µH source impedance
and 33µF electrolytic capacitor (200 mA/div, 1us/div)
Note: Measured input reflected-ripple current with a simulated
source Inductance (LTEST) of 12 µH. Capacitor Cs offset
possible battery impedance. Measure current as shown above
Copper Strip
Vo(+)
SCOPE
RESISTIV
LOAD
10u
1u
Vo(-)
Figure 12: Input reflected ripple current, is, through a 12µH
source inductor at nominal input voltage and rated load current
(20 mA/div, 1us/div)
Figure 13: Output voltage noise and ripple measurement test
setup
Figure 14: Output voltage ripple at nominal input voltage and
rated load current (Io=4.4A)(50 mV/div, 1us/div)
Figure 15: Output voltage vs. load current showing typical
current limit curves and converter shutdown points
Load capacitance: 1µF ceramic capacitor and 10µF tantalum
capacitor. Bandwidth: 20 MHz. Scope measurements 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.
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DESIGN CONSIDERATIONS
Input Source Impedance
EMC Test Result
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.
Test result is in compliance with EN55022 class B as
shown below.
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. Below is the example of using Delta
latest FL75L07 7A surface mountable input filter tested
with V48SR15004 to meet class B compliance.
Schematic and Components
Average mode, @ Vin = 48V, Iout=4.4A
Filter = Delta EMI Filter, FL75L07;
L1 = 1uH differential inductor;
CX = 100uF/100V low impedance electrolytic capacitance;
CY1 = 0.22uF low impedance SMT ceramic capacitance.
Suggested Layout
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DESIGN CONSIDERATIONS
Safety Considerations
Soldering and Cleaning Considerations
The power module must be installed in compliance with
the spacing and separation requirements of the
end-user’s safety agency standard, i.e., UL60950,
CAN/CSA-C22.2 No. 60950-00 and EN60950: 2000 and
IEC60950-1999, if the system in which the power module
is to be used must meet safety agency requirements.
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.
Basic insulation based on 75 Vdc input is provided
between the input and output of the module for the
purpose of applying insulation requirements when the
input to this DC-to-DC converter is identified as TNV-2 or
SELV. An additional evaluation is needed if the source
is other than TNV-2 or SELV.
When the input source is SELV circuit, 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:
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The input source must be insulated from the ac
mains by reinforced or double insulation.
The input terminals of the module are not operator
accessible.
If the metal baseplate is grounded, one Vi pin and
one Vo pin shall also be grounded.
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A SELV reliability test is conducted on the system
where the module is used, in combination with the
module, to ensure that under a single fault,
hazardous voltage does not appear at the module’s
output.
When installed into a Class II equipment (without
grounding), spacing consideration should be given to the
end-use installation, as the spacing between the module
and mounting surface have not been evaluated.
The power module has extra-low voltage (ELV) outputs
when all inputs are ELV.
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.
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FEATURES DESCRIPTIONS
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.
Over-Current Protection
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, and enter hiccup mode or latch
mode, which is optional.
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.
For hiccup mode, the module will try to restart after
shutdown. If the over current condition still exists, the
module will shut down again. This restart trial will continue
until the over-current condition is corrected.
Vi(+)
Vo(+)
Sense(+)
ON/OFF
Sense(-)
For latch mode, the module will latch off once it shutdown.
The latch is reset by either cycling the input power or by
toggling the on/off signal for one second.
Vi(-)
Vo(-)
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, and enter in hiccup
mode or latch mode, which is optional.
Figure 16: Remote on/off implementation
Remote Sense
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:
For hiccup mode, the module will try to restart after
shutdown. If the over voltage condition still exists, the
module will shut down again. This restart trial will continue
until the over-voltage condition is corrected.
[Vo(+) – Vo(–)] – [SENSE(+) – SENSE(–)] ≤ 10% × Vout
For latch mode, the module will latch off once it shutdown.
The latch is reset by either cycling the input power or by
toggling the on/off signal for one second.
This limit includes any increase in voltage due to remote
sense compensation and output voltage set point
adjustment (trim).
Over-Temperature Protection
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, and enter in hiccup mode or latch
mode, which is optional.
Vi(+) Vo(+)
Sense(+)
For hiccup mode, the module will try to restart after
shutdown. If the over temperature condition still exists,
the module will shut down again. This restart trial will
continue until the over-temperature condition is corrected.
Sense(-)
Vi(-) Vo(-)
Contact
Contact and Distribution
Resistance
Losses
For latch mode, the module will latch off once it shutdown.
The latch is reset by either cycling the input power or by
toggling the on/off signal for one second.
Figure 17: Effective circuit configuration for remote sense
operation
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.
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.
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.
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FEATURES DESCRIPTIONS (CON.)
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.
Care should be taken to ensure that the maximum output
power does not exceed the maximum rated power.
Output Voltage Adjustment (TRIM)
To increase or decrease the output voltage set point,
connect an external resistor between the TRIM pin and
either the SENSE(+) or SENSE(-). The TRIM pin
should be left open if this feature is not used.
Figure 19: Circuit configuration for trim-up (increase output
voltage)
If the external resistor is connected between the TRIM
and SENSE (+) the output voltage set point increases
(Fig. 19). The external resistor value required to obtain
a percentage output voltage change △% is defined
as:
5.11Vo (100 + ∆ ) 511
Rtrim − up =
−
− 10.2(KΩ
)
1.225 ∆
∆
Ex. When Trim-up +10% (15V×1.1=16.5V)
Figure 18: Circuit configuration for trim-down (decrease
output voltage)
5.11×15× (100 +10) 511
Rtrim − up =
−
−10.2 = 627
(
KΩ
)
1.225×10
10
If the external resistor is connected between the TRIM
and SENSE (-) pins, the output voltage set point
decreases (Fig. 18). The external resistor value
required to obtain a percentage of output voltage
change △% is defined as:
Trim resistor can also be connected to Vo+ or Vo- but it
would introduce a small error voltage than the desired
value.
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.
511
⎡
⎤
Rtrim − down =
− 10.2 (KΩ)
⎢
⎣
⎥
⎦
∆
Ex. When Trim-down -10% (15V×0.9=13.5V)
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.
511
10
⎡
⎤
Rtrim − down =
− 10.2 (KΩ) = 40.9(KΩ)
⎢
⎣
⎥
⎦
Care should be taken to ensure that the maximum
output power of the module remains at or below the
maximum rated power.
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THERMAL CONSIDERATIONS
Thermal Derating
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.
Heat can be removed by increasing airflow over the module.
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.
Hence, the choice of equipment to characterize the
thermal performance of the power module is a wind
tunnel.
THERMAL CURVES
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.
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 is constantly kept at
6.35mm (0.25’’).
Figure 21: Temperature measurement location
The allowed maximum hot spot temperature is defined at 121℃.
V48SR15004(standard) Output Current vs. Ambient Temperature and Air Velocity
@Vin = 48V (Either Orientation)
Output Current (A)
PWB
MODULE
FACING PWB
5
4
3
2
1
0
Natural
Convection
100LFM
200LFM
AIR VELOCITY
300LFM
400LFM
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
50.8 (2.0”)
500LFM
AIR FLOW
600LFM
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
12.7 (0.5”)
Figure 22: Output Current vs. Ambient Temperature and Air
Velocity @ Vin=48V (Either Orientation)
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
Figure 20: Wind tunnel test setup
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PICK AND PLACE LOCATION
RECOMMENDED PAD LAYOUT (SMD)
SURFACE-MOUNT TAPE & REEL
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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 V48SR, 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 v48SR, measured on the pin +Vout joint.
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MECHANICAL DRAWING
Surface-mount module
Through-hole module
Pin No.
Name
Function
1
2
3
4
5
6
7
8
+Vin
ON/OFF
-Vin
-Vout
-SENSE
TRIM
Positive input voltage
Remote ON/OFF
Negative input voltage
Negative output voltage
Negative remote sense
Output voltage trim
+SENSE
+Vout
Positive remote sense
Positive output voltage
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PART NUMBERING SYSTEM
V
48
S
R
150
04
N
R
F
A
Type of
Product Voltage Outputs
Input Number of Product
Series
Output
Voltage
Output
Current
ON/OFF
Logic
Pin
Length/Type
Option Code
V - 1/16
brick
48V
S - Single R - Regular 150 - 15V
04 - 4A
N- Negative
(Default)
R - 0.170”
(Default)
N - 0.145”
K - 0.110”
M - SMD
A - Standard Functions
F- RoHS 6/6
(Lead Free)
P- Positive
MODEL LIST
MODEL NAME
INPUT
OUTPUT
EFF @ 100% LOAD
V48SR1R225NRFA
V48SR1R525NRFA
V48SR1R825NRFA
V48SR2R520NRFA
V48SR3R320NRFA
V48SR05013NRFA
V48SR12005NRFA
V48SR15004NRFA
36V~75V
36V~75V
36V~75V
36V~75V
36V~75V
36V~75V
36V~75V
36V~75V
1.2A
1.2V
1.5V
1.8V
2.5V
3.3V
5.0V
12V
25A
25A
25A
20A
20A
13A
5.5A
4.4A
84.0%
85.0%
87.0%
89.0%
90.5%
91.0%
91.0%
90.5%
1.4A
1.6A
1.8A
2.4A
2.3A
2.3A
2.3A
15V
Default remote on/off logic is negative and pin length is 0.170”
For different remote on/off logic and pin length, please refer to part numbering system above or contact your local sales office.
USA:
Telephone:
East Coast: (888) 335 8201
West Coast: (888) 335 8208
Fax: (978) 656 3964
Email: [email protected]
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]
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.
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