Power Electronics — question 9 of 10
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The failure only appears after the board has been running hot for a while, not immediately at power-up.
A buck-converter-powered board passes every test at room temperature on the bench, but in a hot enclosure at 55°C ambient, running continuously at full load, the downstream microcontroller resets sporadically. A quick scope check of the supply rail at room temperature looked clean. Walk through how you'd debug this thermally-dependent failure, and specifically what changes at elevated temperature that wouldn't have shown up in your room-temperature bench check.