Delta Electronics Power Supply H48SN User Manual

FEATURES  
High Efficiency: 91.0% @ 28V/12.5A  
Size: 61.0x57.9x12.7mm (2.40”×2.28”×0.50”)  
Standard footprint  
Industry standard pin out  
Fixed frequency operation  
Metal baseplate  
Input UVLO, Output OCP, OVP, OTP  
Basic insulation  
2250V isolation  
2:1 Input voltage range  
ISO 9001, TL 9000, ISO 14001, QS9000,  
OHSAS18001 certified manufacturing facility  
UL/cUL 60950-1 (US & Canada) recognized,  
and TUV (EN60950-1) certified  
CE mark meets 73/23/EEC and 93/68/EEC  
directive  
Delphi Series H48SN, 350W Half Brick Family  
DC/DC Power Modules: 48V in, 28V/12.5A out  
The Delphi Series H48SN Half 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 provides up to 350 watts of power in an  
industry standard footprint. It provides 91% efficiency for 28V 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 models are fully protected  
from abnormal input/output voltage, current, and temperature  
conditions. The Delphi Series converters meet all safety  
requirements with basic insulation. A variety of optional heatsinks are  
available for extended thermal operation as well as for use in higher  
air flow applications: 200 to 400 LFM.  
OPTIONS  
Positive Remote On/Off logic  
Short pin lengths available  
APPLICATIONS  
Telecom / Datacom  
Wireless Networks  
Optical Network Equipment  
Server and Data Storage  
Industrial / Testing Equipment  
DATASHEET  
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ELECTRICAL CHARACTERISTICS CURVES  
45.0  
40.0  
35.0  
30.0  
25.0  
20.0  
15.0  
10.0  
5.0  
95  
36Vin  
48Vin  
75Vin  
36Vin  
48Vin  
75Vin  
90  
85  
80  
75  
70  
0
2
4
6
8
10  
12  
14  
0.0  
OUTPUT CURRENT (A)  
0
2
4
6
8
10  
12  
14  
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.  
14.0  
Io=12.5A  
Io=7.5A  
Io=1.25A  
12.0  
10.0  
8.0  
6.0  
4.0  
2.0  
0.0  
30  
35  
40  
45  
50  
55  
60  
65  
70  
75  
INPUT VOLTAGE (V)  
Figure 3: Typical 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  
Figure 5: Turn-on transient at minimum load current  
load) (10ms/div). CH3: Vout;5V/div; CH1: ON/OFF input: 2V/div  
(10ms/div). CH3: Vout: 5V/div; CH1: ON/OFF input: 2V/div  
For Positive Remote On/Off Logic  
Figure 6: Turn-on transient at full rated load current (resistive  
load) (10ms/div). Top Trace: Vout; 5V/div; Bottom Trace:  
ON/OFF input: 2V/div  
Figure 7: Turn-on transient at zero load current (10ms/div). Top  
Trace: Vout: 5V/div; Bottom Trace: ON/OFF input: 2V/div  
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ELECTRICAL CHARACTERISTICS CURVES  
Figure 8: Output voltage response to step-change in load  
current (75%-50% of Io, max; di/dt = 1A/10µS). Load cap:  
330µF aluminum,10uF Low ESR capacitor and 1µF ceramic  
capacitor. Top Trace: Vout (100mV/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.  
Figure 9: Output voltage response to step-change in load  
current (50%-75% of Io, max; di/dt = 1A/10µS). Load cap:  
330µF aluminum,10uF Low ESR capacitor and 1µF ceramic  
capacitor. Top Trace: Vout (100mV/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.  
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 above.  
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ELECTRICAL CHARACTERISTICS CURVES  
Figure 11: Input Terminal Ripple Current, ic, at full rated output  
current and nominal input voltage with 12µH source impedance  
and 220µF electrolytic capacitor (1A/div).  
Figure 12: Input reflected ripple current, is, through a 12µH  
source inductor at nominal input voltage and rated load current  
(10 mA/div)  
Copper Strip  
Vo(+)  
SCOPE  
RESISTIVE  
LOAD  
10u  
1u  
Vo(-)  
Figure 13: Output voltage noise and ripple measurement test  
setup  
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ELECTRICAL CHARACTERISTICS CURVES  
30.0  
25.0  
20.0  
15.0  
10.0  
5.0  
Vin=48V  
0.0  
0
2
4
6
8
10 12 14 16 18 20  
LOAD CURRENT (A)  
Figure 14: Output voltage ripple at nominal input voltage and  
rated load current (20 mV/div). Load capacitance:330uF  
aluminum, 1µF ceramic capacitor and 10µFlow ESR capacitor.  
Bandwidth: 20 MHz. 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 15: Output voltage vs. load current showing typical  
current limit curves and converter shutdown points.  
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DESIGN CONSIDERATIONS  
Input Source Impedance  
The input source must be insulated from the ac  
mains by reinforced or double insulation.  
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 220 to 470 μF electrolytic  
capacitor (ESR < 0.1 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.  
Layout and EMC Considerations  
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.  
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.  
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.  
Safety Considerations  
The power module has extra-low voltage (ELV) outputs  
when all inputs are ELV.  
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.  
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 20A 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.  
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.  
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.  
When the input source is SELV, 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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FEATURES DESCRIPTIONS  
Vi(+)  
Vo(+)  
Over-Current Protection  
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).  
ON/OFF  
Sense(-)  
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 16: Remote on/off implementation  
Remote Sense  
Over-Voltage Protection  
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:  
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 latch off. The  
over-voltage latch is reset by either cycling the input  
power or by toggling the on/off signal for one second.  
[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  
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.  
Vi(+) Vo(+)  
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.  
Sense(-)  
Vi(-) Vo(-)  
Contact  
Resistance  
Contact and Distribution  
Losses  
Remote On/Off  
Figure 17: Effective circuit configuration for remote sense  
operation  
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.  
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.  
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.  
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 to floating.  
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.  
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FEATURES DESCRIPTIONS (CON.)  
Output Voltage Adjustment (TRIM)  
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  
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:  
Figure 18: Circuit configuration for trim-down (decrease  
output voltage)  
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:  
(
)
Vo100 + Δ%  
100 + 2Δ%  
Δ%  
Rtrim up=  
ΚΩ  
1.225⋅Δ%  
Ex. When Trim-up +10%(28.0V×1.1=30.8V)  
100  
Rtrim down=  
Vo := 28.0V  
Δ := 10  
2 ΚΩ  
Δ%  
(
)
Ex. When Trim-down -60%(28.0V×0.6=16.8V)  
Vo 100 + Δ  
100 + 2 ⋅ Δ  
= 239.429 KΩ  
Vo := 28.0 V  
Δ := 40  
1.225⋅ Δ  
Δ
100  
2 = 0.5K Ω  
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.  
Δ
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 of the module remains at or below the  
maximum rated power.  
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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.  
The module’s maximum case 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.  
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 110℃  
H48SN28012NR A (Standard) Output Power vs. Hot Spot Temperature  
PWB  
Output Power (W)  
(Either Orientation)  
FACING PWB  
400  
350  
300  
250  
200  
150  
100  
50  
MODULE  
AIR VELOCITY  
AND AMBIENT  
TEMPERATURE  
MEASURED BELOW  
50.8 (2.0”)  
12.7 (0.5”)  
THE MODULE  
AIR FLOW  
0
25  
35  
45  
55  
65  
75  
85  
95  
105  
Hot Spot Temperature()  
Figure 22: Output power vs. hot spot temperature (Either  
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)  
Orientation)  
Figure 20: Wind Tunnel Test Setup  
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MECHANICAL DRAWING  
Pin No.  
Name  
Function  
1
2
3
4
5
6
7
8
9
-Vin  
Negative input voltage  
Case ground  
Remote ON/OFF  
Positive input voltage  
Positive output voltage  
Positive remote sense  
Output voltage trim  
Negative remote sense  
Negative output voltage  
CASE  
ON/OFF  
+Vin  
+Vout  
+SENSE  
TRIM  
-SENSE  
-Vout  
Pin Specification:  
Pins 1-4, 6-8  
Pins 5 & 9  
1.00mm (0.040”) diameter  
2.00mm (0.079”) diameter  
All pins are copper with Tin plating.  
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PART NUMBERING SYSTEM  
12  
H
48  
S
N
280  
N
R
F
A
Form  
Factor  
H- Half  
Brick  
Input  
Voltage  
48V  
Number of Product  
Output  
Voltage  
280- 28V  
Output  
Current  
ON/OFF  
Logic  
Pin  
Length  
Option Code  
Outputs  
Series  
F- RoHS 6/6  
(Lead Free)  
S- Single  
N- 350W  
series  
12- 12.5A N- Negative R- 0.170”  
P- Positive N- 0.145”  
A - Standard  
Functions  
K- 0.110” Space - RoHS  
5/6  
B - no thread  
heatsink mounting  
hole  
MODEL LIST  
MODEL NAME  
INPUT  
OUTPUT  
EFF @ 100% LOAD  
91%  
H48SN28012NRFA  
36V~75V  
12.5A  
28V  
12.5A  
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  
USA:  
Telephone:  
East Coast: (888) 335 8201  
West Coast: (888) 335 8208  
Fax: (978) 656 3964  
Europe:  
Asia & the rest of world:  
Telephone: +886 3 4526107 ext 6220  
Fax: +886 3 4513485  
Phone: +41 31 998 53 11  
Fax: +41 31 998 53 53  
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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