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Old 20th December 2005, 11:07 PM   #1
Kevinbd is offline Kevinbd  United Kingdom
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Join Date: Apr 2002
Location: Swindon, U.K.
Default Anyone got a PDF copy of Mikeks Triple VI protection ?


I do actually have the electronics world article but apparently it contained lots of errors in.

Would Triple VI protection be advantagous to lateral mosfets without secondary breakdown?

Have only seen this schematic that uses VI protection. Presumably to get rid of non linear capacitance in the zeners gate protection diodes.

E-mail is Kevin.d@dnc-electronics.com (I'll make sure my mailbox can take the size)



Forgot to mention the supplies were +/-50v unregulated
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Old 20th December 2005, 11:40 PM   #2
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Join Date: Aug 2004
Location: Earth
Hi Kevin,

This is a simple current limiter - it has no operating voltage sense. It simply turns on the sense transistor at 0.66V (say) to rob the MOSFET of drive. It occurs at 8A through the 0R33 source resistors.

BTW, i have tried to reply to your email 3 times , once through your company website and all failed.

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Old 21st December 2005, 12:32 AM   #3
Kevinbd is offline Kevinbd  United Kingdom
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Join Date: Apr 2002
Location: Swindon, U.K.
Hello Greg,

Hmm. That's very strange.

Let me check a few things outs


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