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Performance Data
5.14 Thermal Measurements
Test Methodology:
As shown in figure 5-35, the UCC28C56H EVM was placed in a protective enclosure to isolate the high-voltage
(VIN > 50V) from test personnel. The enclosure did not provide any forced air movement (i.e. there are no fans).
The following thermal results should be considered worst-case due to the dead-air environment. For each load
condition, the soak time was 30 – 45 minutes.
The hottest component on the EVM is the transformer. The transformer temperature was taken two ways: (1) by
a thermocouple taped directly to the top of the windings (see figure 5-36), and (2) using a thermal camera and
black electrical tape placed directly over the thermocouple/windings (see figure 5-37). The two methods provided
results within 2 °C of each other. Temperature of the output rectifier diode and switching MOSFET were taken
only with the thermal camera. The PCB temperature near the transformer was measured with a thermocouple.
Figure 5-35. UCC28C56H EVM in plexiglass enclosure for HV safety. Virtually no airflow.
Figure 5-36. Thermocouple taped to windings
26
Using the UCC28C56EVM-066 High-Density 40-W Auxiliary Power Supply for
800-V Traction Inverters
Figure 5-37. Black tape for thermal camera
Copyright © 2022 Texas Instruments Incorporated
SLUUCN1C – JUNE 2022 – REVISED DECEMBER 2022
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