Delta Electronics Power Supply S48SP User Manual

FEATURES  
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High efficiency: 90% @5V/7A  
Industry standard 1x2 pin out  
Size: 33.0x24.4x8.55mm  
(1.30”x0.96”x0.34”)  
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SMD and Through-hole versions  
Fixed frequency operation  
2:1 input voltage range  
Input UVLO, OVP  
OTP and output OCP, OVP (default is  
auto-restart)  
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Output voltage trim ±10%  
Negative On/Off  
Monotonic startup into normal and  
pre-biased loads  
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2250V isolation and basic insulation  
No minimum load required  
ISO 9001, TL 9000, ISO 14001, QS9000,  
OHSAS18001 certified manufacturing facility  
UL/cUL 60950 (US & Canada) recognized,  
and TUV (EN60950) certified  
CE mark meets 73/23/EEC and 93/68/EEC  
directive  
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Delphi Series S48SP, 35W 1x1 Brick  
DC/DC Power Modules: 48V in, 5V/7A out  
OPTIONS  
The Delphi Series S48SP, 1x1 Brick, 48V input, single output, isolated  
DC/DC converters are the latest offering from a world leader in power  
systems technology and manufacturing -- Delta Electronics, Inc. This  
product family is available in a surface mount or through-hole package  
and provides up to 35 watts of power or 10A of output current (3.3V and  
below) in a new 1x1 form factor (1.3”x0.96”x0.33”). The pinout is  
compatible with the industry standard 1x2 products. 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. Typical efficiency of the 5V/7A module is 90%. All modules  
are fully protected against abnormal input/output voltage, current, and  
temperature conditions.  
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Positive On/Off or no On/Off  
OTP and Output OVP, OCP mode,  
Auto recovery (default) or latch-up  
SMD module available  
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Short pin lengths  
Encapsulated case optional  
APPLICATIONS  
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Optical Transport  
Data Networking  
Communications, including Wireless and  
traditional Telecom  
Servers  
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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  
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Figure 4: Turn-on transient at full rated load current (5 ms/div).  
Vin=48V. Top Trace: Vout, 2V/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, 2V/div, Bottom Trace: ON/OFF input,  
2V/div  
For Positive Remote On/Off Logic  
0
0
0
0
Figure 6: Turn-on transient at full rated load current (5 ms/div).  
Vin=48V. Top Trace: Vout, 2V/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, 2V/div; Bottom Trace: ON/OFF input,  
2V/div  
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ELECTRICAL CHARACTERISTICS CURVES  
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Figure 8: Output voltage response to step-change in load  
current (75%-50% of Io, max; di/dt = 0.1A/µs). Load cap: 10µF  
tantalum capacitor and 1µF ceramic capacitor. Top Trace: Vout  
(100mV/div, 50us/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 (50%-75% of Io, max; di/dt = 0.1A/µs). Load cap: 10µF  
tantalum capacitor and 1µF ceramic capacitor. Top Trace: Vout  
(100mV/div, 50us/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 10: Test set-up diagram showing measurement points  
for Input Terminal Ripple Current and Input Reflected Ripple  
Current.  
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 below.  
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ELECTRICAL CHARACTERISTICS CURVES  
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Figure 11: Input Terminal Ripple Current, ic, at full rated output  
current and nominal input voltage with 12µH source impedance  
and 33µF electrolytic capacitor (100mA/div, 1us/div)  
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)  
Copper Strip  
Vo(+)  
SCOPE  
RESISTIVE  
LOAD  
10u  
1u  
Vo(-)  
Figure 13: Output voltage noise and ripple measurement test  
setup  
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Figure 14: Output voltage ripple at nominal input voltage and  
rated load current (Io=7A)(20 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  
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The input source must be insulated from the ac  
mains by reinforced or double insulation.  
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 at 100 kHz) mounted close to  
the input of the module to improve the stability.  
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.  
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  
to release.  
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.  
Safety 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  
fuse with 3A 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.  
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.  
Soldering and Cleaning Considerations  
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.  
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  
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:  
un-encapsulated and/or open frame type power  
modules. For assistance on appropriate soldering and  
cleaning procedures, please contact Delta’s technical  
support team.  
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FEATURES DESCRIPTIONS  
Remote On/Off  
Over-Current Protection  
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 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.  
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.  
For hiccup mode, the module 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.  
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 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.  
Over-Voltage Protection  
ON/OFF  
Vo(-)  
Trim  
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.  
Vi(-)  
R
Load  
Vi(+)  
For hiccup mode, the module 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.  
Vo(+)  
Figure 16: Remote on/off implementation  
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.  
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.  
For hiccup mode, the module 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.  
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.  
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FEATURES DESCRIPTIONS (CON.)  
Output Voltage Adjustment  
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.  
ON/OFF  
Vo (-)  
Trim  
R
trim-up  
Vi (-)  
R
Load  
Vi (+)  
Vo (+)  
Vo (-)  
Trim  
ON/OFF  
Figure 18: Circuit configuration for trim-up (increase output  
Vi (-)  
R
voltage)  
Load  
R
trim-down  
Vi (+)  
If the external resistor is connected between the TRIM  
and Vo(-) the output voltage set point increases (Fig.  
18). The external resistor value required to obtain an  
output voltage change from 5V to the desired Vo_adj is  
defined as:  
Vo (+)  
Figure 17: Circuit configuration for trim-down (decrease  
output voltage)  
2.55110  
Rtrim_up  
2050  
If the external resistor is connected between the TRIM  
and Vo(+) pins, the output voltage set point decreases  
(Fig. 17). The external resistor value required to obtain  
an output voltage change from 5V to the desired  
Vo_adj is defined as:  
Vo_adj 5.0  
Ex. When Trim-up +10%  
Vo_adj=5.0V×(1+10%)=5.5V  
2.55110  
(Vo_adj 2.5)5110  
Rtrim_up  
2050  
Rtrim_down  
2050  
5.5 5.0  
5.0 Vo_adj  
4
Rtrim_up = 2.35× 10  
ohm  
Ex. When Trim-down -10%  
Vo_adj=5.0V×(1-10%)=4.5V  
When using trim function, the output voltage of the  
module is usually increased, which increases the power  
output of the module with the same output current.  
(4.5 2.5)5110  
Rtrim_down  
2050  
5.0 4.5  
Care should be taken to ensure that the maximum  
output power of the module remains at or below the  
maximum rated power.  
4
Rtrim_down = 1.839× 10  
ohm  
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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.  
Thermal Derating  
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 20: Hot spot temperature measured point  
The allowed maximum hot spot temperature is defined at 111℃  
PWB  
MODULE  
FACING PWB  
S48SP05007(standard) Output Current vs. Ambient Temperature and Air Velocity  
Output Current(A)  
@Vin = 48V (Either Orientation)  
8.0  
7.0  
6.0  
5.0  
4.0  
3.0  
2.0  
1.0  
0.0  
Natural  
Convection  
100LFM  
AIR VELOCITY  
200LFM  
AND AMBIENT  
TEMPERATURE  
MEASURED BELOW  
THE MODULE  
300LFM  
400LFM  
500LFM  
50.8 (2.0”)  
600LFM  
AIR FLOW  
12.7 (0.5”)  
35  
40  
45  
50  
55  
60  
65  
70  
75  
80  
85  
Ambient Temperature  
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)  
Figure 21: Output current vs. ambient temperature and air velocity  
@Vin=48V (Either Orientation)  
Figure 19: Wind tunnel test setup  
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PICK AND PLACE LOCATION  
SURFACE-MOUNT TAPE & REEL  
RECOMMENDED PAD LAYOUT (SMD)  
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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 S48SP, 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 S48SP, 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
+Vin  
-Vin  
Positive input voltage  
Negative input voltage  
Remote ON/OFF (Optional)  
Negative output voltage  
Output voltage trim (Optional)  
Positive output voltage  
ON/OFF (Optional)  
-Vout  
TRIM (Optional)  
+Vout  
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PART NUMBERING SYSTEM  
R
S
48  
S
P
050  
07  
N
F
B
Product  
Type  
Input Number of Product  
Output  
Voltage  
050 - 5V  
Output  
Current  
07 - 7A  
Pin  
ON/OFF Logic  
Option Code  
Voltage Outputs  
Series  
Length/Type  
R - 0.170” F- RoHS 6/6 A - No trim pin  
S - Small  
Power  
48 -  
S - Single  
1x1, 10A  
N - Negative  
(Default)  
36V~75V  
(Default) (Lead Free) B - With trim pin  
P - Positive  
N - 0.145”  
(Default)  
E - No remote  
on/off control pin  
K - 0.110”  
M - SMD  
MODEL LIST  
MODEL NAME  
INPUT  
OUTPUT  
EFF @ 100% LOAD  
S48SP3R310NRFB  
S48SP05007NRFB  
S48SP12003NRFB  
S48SP15002NRFB  
36V~75V  
1.1A  
1.2A  
1.2A  
1A  
3.3V  
10A  
89.0%  
90.0%  
90.0%  
90.0%  
36V~75V  
36V~75V  
36V~75V  
5.0V  
12V  
15V  
7A  
3A  
2A  
Note:  
1. Default OTP and output OVP, OCP mode is auto-restart;  
2. For different option, please refer to part numbering system above or contact Delta local sales.  
USA:  
Europe:  
Asia & the rest of world:  
Telephone:  
Telephone: +41 31 998 53 11  
Fax: +41 31 998 53 53  
Telephone: +886 3 4526107 x6220  
Fax: +886 3 4513485  
East Coast: (888) 335 8201  
West Coast: (888) 335 8208  
Fax: (978) 656 3964  
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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