E36SR12004NKFA Datasheet, PDF (10/13 Pages) Delta Electronics, Inc. – Delphi E36SR Series DC/DC Power Modules 18~60 in, 12V/4A out, 48W

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’’).
FANCING PWB
PWB
MODULE
AIR VELOCITY
AND AMBIENT
TEMPERATURE
SURED BELOW
THE MODULE
AIR FLOW
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
Figure 20: Wind tunnel test setup
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.
THERMAL CURVES
NTC RESISTOR
HOT SPOT
AIRFLOW
Figure 21: * Hot spot& NTC resistor temperature measured points.
E36SR12004(Standard) Output Current vs. Ambient Temperature and Air Velocity
Output Current (A)
@Vin = 24V (Transverse Orientation)
4.5
4.0
3.5
Natural
Convection
3.0
100LFM
200LFM
2.5
300LFM
2.0
400LFM
1.5
1.0
0.5
0.0
25
30
35
40
45
50
55
60
65
70
75
Ambient
80
Temperature
(℃⁸⁵⁾
Figure 22: Output current vs. ambient temperature and air
velocity@Vin=24V (Transverse orientation,airflow from Vin- to Vin+)
E36SR12004(Standard) Output Current vs. Ambient Temperature and Air Velocity
Output Current (A)
@Vin = 48V (Transverse Orientation)
4.5
4.0
Natural
3.5
Convection
3.0
100LFM
200LFM
2.5
300LFM
2.0
1.5
1.0
0.5
0.0
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Figure 23: Output current vs. ambient temperature and air
velocity@Vin=48V (Transverse orientation, airflow from Vin- to Vin+)
DS_E36SR12004_10292013
10