The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
Subject: Re: Recommend a flyback IC?
Date: Fri, 20 Sep 2002 22:03:19 +0100
References: <3D8A2BFD.firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <3D8B5D94.9060306@BOGUS.earthlink.net> <email@example.com> <3D8B7DC9.4030605@BOGUS.earthlink.net>
NNTP-Posting-Host: modem-156-11-60-62.vip.uk.com (184.108.40.206)
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Try this 555 approach. The power level in your app is a little higher but
the design principles should be the same:
"Chris Carlen" wrote in message
> Nico Coesel wrote:
> > Chris Carlen wrote:
> >>Nico Coesel wrote:
> >>>Depends on what you want. If you need to convert one stabilized
> >>>voltage into another, you can do with a fixed pulse-width ratio
> >>>converter. Using an NE555 was just easier in that particular case.
> >>Yes, but I did indicate that the supply would be unregulated over a wide
> >>range, and that the output should be regulated. This certainly rules
> >>out an open loop conversion.
> > True, but that's where the NE555 reset input comes into picture... In
> > the circuit I've designed I put an NPN transistor at the reset input
> > to pull the reset low. I made a diode-or gate at the base to which I
> > connected overvoltage (just some zener diodes) and (cycly-by-cycle)
> > current protection (resistor in series with the source of the MOSFET).
> > This regulates the output voltage and makes the converter
> > short-circuit proof.
> Hmm, clever.
> But I don't have time to think about lower-level design issues right now
> for this task. I want it as cookbook as possible, so I can deal with
> other problems.
> Thanks for the info!
> Christopher R. Carlen
> Suse 7.3 Linux 2.4.10
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup