Test for blown body-diode in mosfet?

h_a · 28th June 2009, 02:41 PM

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).

Bonsai · 28th June 2009, 03:46 PM

The body diode is part of the structure.

You cannot have a blown body diode without a blown mosfet.

h_a · 29th June 2009, 08:47 AM

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

28th June 2009, 02:41 PM	#1
h_a diyAudio Member Join Date: Sep 2006	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).

28th June 2009, 03:46 PM	#2
Bonsai diyAudio Member Join Date: Aug 2006 Location: Tokyo	The body diode is part of the structure. You cannot have a blown body diode without a blown mosfet. __________________ bonsai

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29th June 2009, 08:47 AM	#3
h_a diyAudio Member Join Date: Sep 2006	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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