Re: SSTC Power FET's w/ High Speed Body Diodes

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "gtyler" <gtyler-at-drummond-dot-org.za> 

I am not so sure you actually need either the fast diode fets or the
schottkey's, If the circuit is designed so that the load is always
inductive there is no problem. The reverse diodes are always not
conducting before the opposite fet turns on, so the recovery current
does not exist.

George

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, January 16, 2004 8:56 PM
Subject: Re: SSTC Power FET's w/ High Speed Body Diodes


 > Original poster: David Sharpe <sccr4us-at-erols-dot-com>
 >
 > Ken
 >
 > IDK.  I suspect that they are intended for production release
 > and may have some yield issues.  Yea I saw no inventory either,
 > but wanted to post this ASAP to let SSTCoiler be aware that
 > manufacturer's hadn't forgetten them, and the schottky diode +
 > antiparallel diode is a well known shortcoming of high power
 > FET converters...
 >
 > Regards
 > Dave Sharpe, TCBOR/HEAS
 > Chesterfield, VA. USA
 >
 > Tesla list wrote:
 >
 >  > Original poster: "K. C. Herrick" <kchdlh-at-juno-dot-com>
 >  >
 >  > All well & good, but...clicking further reveals "no posted
availability"
 >  > for any of them.  Vaporware?...
 >  >
 >  > Ken Herrick
 >  >
 >  > On Thu, 15 Jan 2004 19:00:21 -0700 "Tesla list" <tesla-at-pupman-dot-com>
 >  > writes:
 >  >  > Original poster: David Sharpe <sccr4us-at-erols-dot-com>
 >  >  >
 >  >  > Attached is a URL to International Rectifer.  The parts listed
 >  >  > have internal hyperfast body diodes; no more schottky + HS
 >  >  > antiparallel diode to disable typically slow body diode.
 >  >  >
 >  >  >   http://www.irf-dot-com/whats-new/nr030320.html
 >  >  >
 >  >  > Several AN show half and full bridge topologies using listed
 >  >  > parts with none of these extra parts.  Removal of parts are
 >  >  > the anti-thesis of "Murphy's Law", if the're not there, they
 >  >  > won't be a thorn in your as...
 >  >  >
 >  >  > Parts are typical <$2.00 -at- 10K, single part cost should be
 >  >  > less then $10.
 >  >  >
 >  >  > FWIW
 >  >  >
 >  >  > Regards
 >  >  > Dave Sharpe, TCBOR/HEAS
 >  >  > Chesterfield, VA. USA
 >  >  >
 >  >  >
 >  >  >
 >
 >
 >