Test for blown body-diode in mosfet? - diyAudio
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Old 28th June 2009, 01:41 PM   #1
h_a is offline h_a  Europe
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Default Test for blown body-diode in mosfet?

Hi all,

due to a half-blown bridge I was forced to think about what happens to a mosfet that gets his polarity reversed (so negative VDS for N-channel part and vice versa, gate is clamped to +-8VGS).

So there is this internal body diode that is not spec'd for the Toshiba 2SK1530 power mosfet.

How can I see wether this diode is shot?

Or asked differently, is a power mosfet usually completely shot when its body diode is fried?

Have fun, Hannes

PS: I was lucky, the other half of the bridge was ok, so all my mosfets got was a sagging rail (sort of half wave rectification).
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Old 28th June 2009, 02:46 PM   #2
Bonsai is offline Bonsai  Taiwan
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The body diode is part of the structure.

You cannot have a blown body diode without a blown mosfet.
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Old 29th June 2009, 07:47 AM   #3
h_a is offline h_a  Europe
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From what I've read it's a contact to one of the layers, so I thought it was possible.

Thanks that was the reply I was looking for

Have fun, Hannes
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