Is a capacitor needed in parallel a with freewheeling diode ?

It is standard practice to put a freewheeling/clamping diode in parallel with an inductive load to clamp high voltage transients when the inductive load is switched off abruptly.

I have seen some designs where a capacitor ( typically 10 to 100nF ) is also added in parallel with the clamping diode. Many designs, however, do not have this capacitor.

What are the pro(s) and con(s) of having this capacitor ?

Regards

Oguz

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oguz
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It would reduce the dv/dt at the switching device, at the expense of higher current at turn-on.

Best regards, Spehro Pefhany

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