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Running 36v dc motor that draws approximately 5-10A continuous.what fly back diode should I use to protect my h bridge fets? Specs or a calculation or simply a suggestion would be most appreciated
Thanks,
matt
If you are switching over say about 400Hz you should use a high speed diode like a Schottky rated for the full current plus some headroom.
Under that frequency you can get away with an ordinary rectifier diode rated for the full current plus a little more for headroom.
Well now's your chance to stop being under that impression
Seriously though, the current through the inductor theoretically does not decrease in the first few instants of the 'flyback' operation, so it would be good to have a diode that can handle the full current.
A snubber is often used when there is a danger of a short high voltage spike from occuring in spite of having a diode and blowing out some other component. You many not need one.
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