Datasheet
DS_IPM24S0C0_01092009
9
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 height of this fan duct is constantly kept at
25.4mm (1’’).
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.
MODULE
AIR FLOW
12.7 (0.5”)
50.8 (2.0”)
FACING PWB
PWB
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
25.4 (1.0”)
Note: Figure dimensions are in millimeters and (inches)
Figure 24: Wind tunnel test setup
THERMAL CURVES
Figure 25: Temperature measurement location
* The allowed maximum hot spot temperature is defined at 125
℃
.
IPM24S (Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vin=24V, Vout = 8V (Either Orientation)
0
1
2
3
50 55 60 65 70 75 80 85
Ambient Temperature (℃)
Output Current(A)
Natural
Convection
100LFM
200LFM
300LFM
Figure 26: Output current vs. ambient temperature and air velocity
@ Vin=24V, Vout=8V(Either Orientation)
IPM24S (Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vin=24V, Vout = 15V (Either Orientation)
0
1
2
3
50 55 60 65 70 75 80 85
Ambient Temperature (℃)
Output Current(A)
Natural
Convection
100LFM
200LFM
300LFM
400LFM
Figure 27: Output current vs. ambient temperature and air velocity
@ Vin=24V, Vo=15V(Either Orientation)