From: John Larkin
Subject: Re: My flyback experiment is on the web
Date: Wed, 16 Oct 2002 09:20:50 -0700
Organization: Posted via Supernews, http://www.supernews.com
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>Schottky diodes for a 200V output will be "hard" to find. But 2 diodes, one
>in series with the maos drain, the other in parallel with the "new" level
>shifted drain will do the trick.
I just got samples (30!) of the new Infineon 600 volt silicon carbide
schottkies. I've been waiting years for these to be real, so now I can
build my... (laughs diabolically...) But Vf is a tad high for shunting
the fet substrate. IR has 200 volt silicon parts.
>Oh, spice can provide you some of those nice multiKV ultra low forward drop
Yeah, life and love would be better if they behaved like the
>BTW, SRDs becoming almost impossible to find, does somebody have a reference
>for good "bad diode", exhibiting (really)good step recovery behaviour at
>resonnable power levels ? I have some at SMPS power levels but that to much
>power waste just for the purpose of a generator.
If you mean little dinky SRDs, there's Metelics, M-pulse, and M/Acom.
All SRD makers must begin with 'M'. M/Acom has the only
distributor-stocked parts I know of (MA44769 and such; cheap.) If you
mean power SRDs, I don't know of anybody who makes them any more. The
alternative is Grehkov-type DSRDs (drift step-recovery diodes) which,
as far as I know, people seem to make only by accident.
I've been told that some varicaps make nice SRDs, but haven't had time
to explore that.
Where did you get your power-level SRDs?