Test for blown body-diode in mosfet? - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 28th June 2009, 01:41 PM   #1
h_a is offline h_a  Europe
diyAudio Member
h_a's Avatar
Join Date: Sep 2006
Location: Graz, Austria
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).
  Reply With Quote
Old 28th June 2009, 02:46 PM   #2
Bonsai is offline Bonsai  Europe
diyAudio Member
Bonsai's Avatar
Join Date: Jul 2003
Location: Europe
The body diode is part of the structure.

You cannot have a blown body diode without a blown mosfet.
Amplifier Design and Construction for MUSIC! http://hifisonix.com/
  Reply With Quote
Old 29th June 2009, 07:47 AM   #3
h_a is offline h_a  Europe
diyAudio Member
h_a's Avatar
Join Date: Sep 2006
Location: Graz, Austria
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
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Blown diode on my RF power500a2 juannava Car Audio 1 9th June 2008 05:27 PM
Disabling MOSFET body diode... RiskCord Class D 49 30th May 2008 10:13 AM
blown diode in kenwood kac s726 magicrobot Car Audio 4 5th August 2005 06:41 AM

New To Site? Need Help?

All times are GMT. The time now is 06:04 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
Copyright 1999-2016 diyAudio

Content Relevant URLs by vBSEO 3.3.2