Delta Electronics Power Supply Series E24SR User Manual

FEATURES  
High efficiency: 90.5% @ 5V/ 12A  
Size: 58.4mm x 22.8mm x 10.0mm  
(2.30” x 0.90” x 0.39”)  
SMD and Through-hole versions  
Industry standard pin out  
2:1 input range  
Fixed frequency operation  
Input UVLO, Output OTP, OCP, OVP  
Basic insulation  
2250V isolation  
Monotonic startup into normal and  
pre-biased loads  
Output voltage trim ±10%  
No minimum load required  
ISO 9001, TL 9000, ISO 14001, QS 9000,  
OHSAS 18001 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 E24SR, 66W Eighth Brick Family  
DC/DC Power Modules: 24V in, 5V/12A out  
OPTIONS  
The Delphi Series E24SR Eighth Brick, 24V 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 either a through-hole or surface-mounted  
package and provides up to 66 watts of power or 20A of output current  
(3.3V and below) in an industry standard footprint and pinout. The  
E24SR converter operates from an input voltage of 18V to 36V and is  
available in output voltages from 3.3V to 12V. Efficiency for the 5V output  
is 90.5% at 12A 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.  
Positive On/Off logic  
SMD pin  
Short pin lengths available  
APPLICATIONS  
Telecom / DataCom  
Wireless Networks  
Optical Network Equipment  
Server and Data Storage  
Industrial / Test Equipment  
DATASHEET  
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ELECTRICAL CHARACTERISTICS CURVES  
7.0  
6.0  
5.0  
4.0  
3.0  
2.0  
1.0  
92  
90  
18Vin  
24Vin  
36Vin  
88  
18Vin  
86  
24Vin  
84  
36Vin  
82  
80  
2
4
6
8
10  
12  
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.  
4.0  
3.5  
3.0  
2.5  
2.0  
1.5  
1.0  
0.5  
0.0  
18  
20  
22  
24  
26  
28  
30  
32  
34  
36  
Input Voltage (V)  
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) (2 ms/div). Vin=24V. Top Trace: Vout, 2.0V/div; Bottom  
Trace: ON/OFF input, 10V/div  
Figure 5: Turn-on transient at zero load current (2 ms/div).  
Vin=24V. Top Trace: Vout: 2.0V/div, Bottom Trace: ON/OFF  
input, 10V/div  
For Positive Remote On/Off Logic  
Figure 6: Turn-on transient at full rated load current (resistive  
load) (2 ms/div). Vin=24V. Top Trace: Vout, 2.0V/div; Bottom  
Trace: ON/OFF input, 10V/div  
Figure 7: Turn-on transient at zero load current (2 ms/div).  
Vin=24V Top Trace: Vout, 2.0V/div; Bottom Trace: ON/OFF  
input, 10V/div  
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ELECTRICAL CHARACTERISTICS CURVES  
0
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 (100mV/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  
Figure 9: Output voltage response to step-change in load  
current (75%-50%-75% of Io, max; di/dt = 1A/µs). Load cap:  
470µF, 35mΩ ESR solid electrolytic capacitor and 1µF ceramic  
capacitor.  
Top Trace: Vout (100mV/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  
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, 2us/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  
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ELECTRICAL CHARACTERISTICS CURVES  
Copper Strip  
Vo(+)  
Vo(-)  
SCOPE  
RESISTIVE  
LOAD  
10u  
1u  
Figure 12: Input reflected ripple current, is, through a 12µH  
source inductor at nominal input voltage and rated load current  
(20 mA/div, 2us/div)  
Figure 13: Output voltage noise and ripple measurement test  
setup  
6.0  
4.0  
2.0  
0.0  
2
4
6
8
10  
12  
14  
16  
Loadt Current (A)  
Figure 15: Output voltage vs. load current showing typical  
current limit curves and converter shutdown points  
Figure 14: Output voltage ripple at nominal input voltage and  
rated load current (Io=12A)(20 mV/div, 2us/div)  
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  
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 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.  
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  
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.  
compliance design.  
Application notes to assist  
designers in addressing these issues are pending  
release.  
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 15A 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 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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FEATURES DESCRIPTIONS  
Vo(+)  
Sense(-)  
Trim  
Vi(+)  
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.  
ON/OFF  
Vi(-)  
Sense(-)  
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  
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  
Vo(+)  
Sense(-)  
Trim  
Vi(+)  
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.  
R
ON/OFF  
Vi(-)  
Load  
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.  
Vo(-)  
Distribution  
resistance  
Figure 17: 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.  
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FEATURES DESCRIPTIONS (CON.)  
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:  
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:  
5.11Vo (100 + Δ ) 511  
Rtrim up =  
10.2(KΩ  
)
1.225 Δ  
Δ
511  
Rtrim down =  
10.2 (KΩ)  
Ex. When Trim-up +10% (5V×1.1=5.5V)  
Δ
Ex. When Trim-down -10% (5V×0.9=0.45V)  
5.11×5×(100 +10) 511  
Rtrim up =  
10.2 = 168.13  
(
KΩ  
)
1.225×10  
10  
511  
10  
Rtrim down =  
10.2 (KΩ) = 40.9(KΩ)  
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.  
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 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: Hot spot temperature measured point  
The allowed maximum hot spot temperature is defined at 118℃  
E24SR05012(Standard) Output Current vs. Ambient Temperature and Air Velocity  
Output Current(A)  
@Vin = 24V (Transverse Orientation)  
12  
Natural  
Convection  
10  
PWB  
MODULE  
FACING PWB  
100LFM  
8
200LFM  
6
4
2
0
AIR VELOCITY  
AND AMBIENT  
TEMPERATURE  
MEASURED BELOW  
THE MODULE  
50.8 (2.0”)  
AIR FLOW  
25  
30  
35  
40  
45  
50  
55  
60  
65  
70  
75  
80  
85  
Ambient Temperature ()  
Figure 22: Output current vs. ambient temperature and air velocity  
@Vin=24V (Transverse Orientation)  
12.7 (0.5”)  
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  
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 E24SR, 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 E24SR, 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  
-SENSE  
-Vout  
Negative input voltage  
Remote ON/OFF  
Positive input voltage  
Positive output voltage  
Positive remote sense  
Output voltage trim  
Negative remote sense  
Negative output voltage  
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PART NUMBERING SYSTEM  
E
24  
S
R
050  
12  
N
R
F
A
Type of  
Product Voltage  
Input  
Number of Product  
Output  
Voltage  
Output  
Current  
ON/OFF  
Logic  
Pin  
Length/Type  
Option Code  
Outputs  
Series  
E - Eighth  
Brick  
24V  
S - Single  
R - Regular  
050 - 5.0V  
12 - 12A  
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  
E24SR3R320NRFA  
E24SR05012NRFA  
E24SR06508NRFA  
E24SR12005NRFA  
INPUT  
OUTPUT  
EFF @ 100% LOAD  
18V~36V  
18V~36V  
18V~36V  
18V~36V  
5.0A  
4.2A  
3.4A  
4A  
3.3V  
20A  
12A  
8A  
90%  
5.0V  
6.5V  
12V  
90.5%  
90.5%  
90.5%  
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 office.  
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  
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at any time, without notice.  
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