Technical Reference Note
Operating Temperature
Rev.09.30.14_#1.0
AVO250-48S28B
Page 14
The AVO250-48S28B power supply will start and operate within stated specifications at an ambient temperature from -40
OC to 85 OC under all load conditions. The storage temperature is -55 OC to 125 OC.
.
Thermal Considerations
The converter can both operate in two different modes.
Mode 1: The converter can operate in an enclosed environment without forced air convection.Cooling of the converter is
achievedmainly by conduction from the baseplate to a heat sink. The converter can deliver full output power at 85 OC
ambient temperature provided the baseplate temperature is kept the max values 100 OC. P1 in Figure 11 is the baseplate
test point. Test data listed in Table 6.
Table 6. Thermal derating at different input voltage:
Vin
36V
48V
60V
75V
Output Current (max)
4.8A
4.3A
3.8A
3.1A
Mode 2: The converter is designed to operate in different thermal environments and sufficient cooling must be provided.
Proper cooling of the DC/DC converter can be verifiedby measuring the temperature at the test point as shown in the
Figure 11. The temperature at this point should not exceed the maximum values in the table 7.
Test point on baseplate
Test point on PCB
Figure 11 Temperature test points
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