D12S2R550A Datasheet, PDF (9/11 Pages) Delta Electronics, Inc. – Non-Isolated Point of Load DC/DC Modules: 4.5V~13.8Vin, 0.6V~5.0Vout, 50A

THERMAL CONSIDERATION
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’’).
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.
FANCING PWB
PWB
MODULE
AIR VELOCITY
AND AMBIENT
TEMPERATURE
SURED BELOW
THE MODULE
AIR FLOW
THERMAL CURVES
Figure 35: Temperature measurement location* The allowed
maximum hot spot temperature is defined at 120℃
Output Current (A)
50
D12S2R550A Output Current vs. Ambient Temperature and Air Velocity
@Vin=12V Vout=1.1V (Airflow From Pin1 To Pin11)
40
Natural
Convection
30
20
100LFM
200LFM
10
0
25
30
35
40
45
50
55
60
65
70
Ambient Temperature (℃)
Figure 31: Output current vs. ambient temperature and air
velocity @Vin=12V, Vout=1.1V (Airflow from Pin1 to Pin11)
Output Current (A)
50
D12S2R550A Output Current vs. Ambient Temperature and Air Velocity
@Vin=5V Vout=1.2V (Airflow From Pin1 To Pin1)
40
Natural
Convection
30
100LFM
20
200LFM
10
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
Figure 30: Wind tunnel test setup
0
25
30
35
40
45
50
55
60
65
70
Ambient Temperature (℃)
Figure 32: Output current vs. ambient temperature and air
velocity@ Vin=5V, Vout=1.2V (Airflow from Pin1 to Pin11)
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