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DESCRIPTION: point of load converter
7 of 12
08/2007
PART NUMBER: VPOL5A-12-SIP
7.2 Convection Requirements for Cooling
To predict the approximate cooling needed for the module, refer to the
Power De-rating curves in Figures 8 & 9 . These de-rating curves are
approximations of the ambient temperatures and airflows required to
keep the power module temperature below its maximum rating. Once
the module is assembled in the actual system, the module’s
temperature should be checked as shown in Figure 6 to ensure it does
not exceed 110°C.
Proper cooling can be verified by measuring the power module’s
temperature at Q1-pin 6 as shown in Figure 7.
25.4(1.0)
12.7(0.5)
76.2(3.0)
Power Module
A
ir
flow
Thermocuple Location
for measuring
ambient temperature
and airflow
Bakelite
Wind
Tunnel
Note : Dimensions are in millimeters and (inches)
Figure 6. Thermal Test Setup
Figure 7. Temperature Measurement Location for
VPOL5A-12-SIP
7.3 Thermal Considerations
The power module operates in a variety of thermal environments;
however, sufficient cooling should be provided to help ensure reliable
operation of the unit. Heat is removed by conduction, convection, and
radiation to the surrounding environment. The thermal data presented is
based on measurements taken in a set-up as shown in Figure 6.
Figures 8 & 9 represent the test data. Note that the airflow is parallel to
the long axis of the module as shown in Figure 6 for the VPOL5A-12-
SIP.
The temperature at either location should not exceed 110 °C. The
output power of the module should not exceed the rated power for the
module (VO, set x IO, max). The SMT05 thermal data presented is
based on measurements taken in a wind tunnel. The test setup shown
in Figure 7 and EUT need to solder on 33mm x 40.38mm(1.300'' x
1.59'') test pcb. Note that airflow is parallel to the long axis of the
module as shown in Fig 6.
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