11. Inductor Selection

Question.1

You are testing a buck converter delivering 5V at 2A. During full-load testing, the power inductor becomes significantly hot, even though the output voltage remains stable.

What is the most likely cause of this inductor heating?

Buck boost converter module Inductor heating highlighted

The inductor’s ESR is too low, causing core ringing
The inductor is operating below its rated RMS current
The inductor’s DC resistance (DCR) is too high, or the current through it is near saturation
The output capacitor is oversized, overloading the inductor

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