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From: jws@thumper.mlb.semi.harris.com (James W. Swonger)
Newsgroups: sci.electronics
Subject: Re: How to make 600VDC from 800VDC
Message-ID: <1990Oct18.134252.4635@mlb.semi.harris.com>
Date: 18 Oct 90 13:42:52 GMT
References: <92@decabo.enet.dec.com>
Sender: news@mlb.semi.harris.com
Organization: Harris Semiconductor, Melbourne FL
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      800V+ --------------|------|
                          |      |
                          >      |
   Limiting resistor ~   <       |
   10K ohms (20mA base    >      |
   drive, assume Hfe is   |    | /
   >= 10.                 |    |/     TV flyback (horizontal
                          +----|      output) 1500V BVceo  
                          |    |\     at least 50W. Better to
                         ---   | V    parallel a couple with 
                          ^      |    emitter ballast resistors.
                         /_\     |____________ 600V+
                          |
                          .
                          . Stack of diodes with
                          . breakdown ~ 600V
                          |
                         ---
                          ^
                         /_\
                          |
                        __|__
                        /////