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Re: BEWARE of dead gate drive IC that still works



Original poster: "David Sharpe by way of Terry Fritz <twftesla-at-qwest-dot-net>" <sccr4us-at-erols-dot-com>

Justin

On the ouput of the driver chip to the gate drive transformer (GDT), install
two high speed schottky diodes in a doubler configuration.  The anode of
the lower diode goes to the ground and cathode to output of the driver. The
second diodes anode is wired to output of driver and cathode is to +Vcc
operating chip / GDT.  Must be a high speed schottky like 1n5819-1n5822
family.  The transformers leakage inductance is kicking back into chip at
power up or down and driving output above (or below) supply rails.

Folks this is guaranteed to blow up silicon, or compromise outputs.

Regards
Dave Sharpe, TCBOR
Chesterfield, VA. USA

PS: Justin contact me directly, have additional info.

Tesla list wrote:

> Original poster: "Justin Hays by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<pyrotrons2000-at-yahoo-dot-com>
>
> Hi All.
>
> (this post is SSTC/SMPS related, and is longwinded)
>
> Maybe not just Maxim. Possibly other manufacturers also, but I've
> seen this a LOT with Maxim specifically.
>

SNIPPO>>