Direct Junction Temperature Measurement of a DC Switching Power Supply

Designers often want to measure the junction temperature of a DC switching power supply. This is especially difficult in temperature chambers because a thermal camera is inaccurate and can be damaged under high environmental temperatures, and an external temperature sensor is difficult to fix onto small packages. This whitepaper will help readers understand a practical method to measure the junction temperature of an IC by demonstrating how to implement a direct readout temperature measuring method using the MOSFET body diode of a power good (PG) pin. This is a direct voltage readout method using the diode voltage vs. temperature relationship.

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