Re: Paralleling FET's

• To: tesla-at-pupman-dot-com
• Subject: Re: Paralleling FET's
• From: Neon John <johngd-at-bellsouth-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Thu, 21 Oct 1999 20:28:41 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

> 
> PS. Ever seen a HV diode tossing out its silicon die in flame from its case?

Yup.  years ago, on the even of the microprocessor age.  Designing
high performance stepper motor translator.  running amplifier from
the lab's heavilly filtered 100 volt DC bus backed by a 500 amp
supply.  Using a shift register to implement the switching regime. 
Occasionally the shift register would load wrong and crowbar the bus
with one side of the H driver.  After the smoke cleared, one would
observe the exact outline in the top of the TO-3 can of the pins,
the bonding wires and the die.  Exploding wire cutting at its finest
:-)  Of course, the high speed semiconductor fuses just sat there
and watched it happen.

John

-- 
John De Armond
johngdSPAMNOT-at-bellsouth-dot-net
http://neonjohn.4mg-dot-com
Neon John's Custom Neon
Cleveland, TN
"Bendin' Glass 'n Passin' Gas"

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