Delta Electronics Power Supply S24SA User Manual

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")  
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.  
SMD or Through hole mounting  
APPLICATIONS  
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 mESR tantalum capacitor and 1µF ceramic capacitor.  
Top Trace: Vout (50mV/div), Bottom Trace: Iout (5A/div).  
is  
Vi (+)  
Cs : 220uF  
ESR < 0.1  
@20100KHZ  
Cs :100uF  
ESR < 0.5Ω  
@20100KHZ  
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 mESR 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 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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DS_S24SA1R812_05092006  
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  
A6 pins, no  
F- RoHS 6/6  
(Lead Free)  
sense  
B8 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  
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  
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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DS_S24SA1R812_05092006  

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