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E48SR12005NRFA Datasheet(PDF) 11 Page - Delta Electronics, Inc.

Part # E48SR12005NRFA
Description  Delphi Series E48SR, 66W Eighth Brick Family DC/DC Power Modules: 48V in, 2.5V/20A out
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Manufacturer  DELTA [Delta Electronics, Inc.]
Direct Link  http://www.deltaww.com
Logo DELTA - Delta Electronics, Inc.

E48SR12005NRFA Datasheet(HTML) 11 Page - Delta Electronics, Inc.

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DS_E48SR2R520_10182013
11
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.
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’’).
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
12.7 (0.5”)
MODULE
AIR FLOW
50.8 (2.0”)
FACING PWB
PWB
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
Figure 20: Wind tunnel test setup
Thermal Derating
Heat can be removed by increasing airflow over the module.
The hottest point of the module is +108°C. 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.
THERMAL CURVES
Figure 21: Hot spot temperature measured point
The allowed maximum hot spot temperature is defined at 108
E48SR2R520(Standard) Output Load vs. Ambient Temperature and Air Velocity
@Vin =48V(Transverse Orientation)
0
4
8
12
16
20
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Output Current(A)
Natural
Convection
100LFM
200LFM
300LFM
600LFM
400LFM
500LFM
Figure 22: Output current vs. ambient temperature and air
velocity@Vin=48V(Transverse Orientation)


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