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Subject: Re: Diode Reverse dV/dT Problem

Date: 06/28/02 at 5:21 PM
Posted by: John Dunn - Consultant
E-mail: ambertec@ieee.org
Message Posted:

In Reply to: Re: Diode Reverse dV/dT Problem posted by Ron H on 06/26/02 at 5:22 PM:

Hi, Ron and thank you.

I downloaded that application note and read it. It's a very nice piece of writing indeed!

The problem though, is that they address dV/dT limitations of the power MOSFETs under the assumption that no other devices, diode included, will have dV/dT limits of their own.

On page 4, there is the phrase "... the diode's cathode-to-anode voltage continues to increase in response.". In other words, the diode doesn't break down. I suspect however, that my diode(s) are breaking down, in spite of a fast trr rating and despite a high PIV rating.

Schottky diodes were/are known for this kind of limitation and although I've never read of such a thing for non-Schottky's, I suspect something like that is happening.

Hence, my call for HELP!!!!

Ah well. I guess life wouldn't be fun without problems like this.

Thank you again, Ron.

John Dunn

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