> Analog comparator, contrary to what was going through
> my mind (using the ADC, which wouldn't be that fast,
> probably)

For a high frequency drive that would be true, although the actual
frequency used will depend on the coil being driven, eg the trend
towards higher freqencies and smaller inductors in newer SMPS
likely wouldn't carry over into larger coils like power transformers
and large-ish motors

Joe
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