Xref: utzoo sci.electronics:5086 misc.wanted:3922 misc.misc:4669
Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!nrl-cmf!ukma!tut.cis.ohio-state.edu!ucbvax!decwrl!decvax!tektronix!midas!jeffw
From: jeffw@midas.STS.TEK.COM (Jeff Winslow)
Newsgroups: sci.electronics,misc.wanted,misc.misc
Subject: Re: Need Info on Switching Supply Design
Message-ID: <3974@midas.STS.TEK.COM>
Date: 9 Feb 89 22:34:06 GMT
References: <870@inuxm.UUCP> <1989Feb8.225741.27473@utzoo.uucp>
Reply-To: jeffw@midas.STS.TEK.COM (Jeff Winslow)
Organization: Tektronix, Inc., Beaverton,  OR.
Lines: 21

In article <1989Feb8.225741.27473@utzoo.uucp> henry@utzoo.uucp (Henry Spencer) writes:
>In article <870@inuxm.UUCP> micl23@inuxm.UUCP (W E Miller) writes:
>>I have a friend who is interested in designing
>>a switching supply. He is interested in using
>>it/them to research and to use as a service jig.
>
>He's aware, I hope, that switching supplies generally regulate poorly at
>low loads, so they are not good choices for research and service work
>where power demands vary a lot.

I suppose this is true for most off-the-shelf cost-pared-to-the-bone
supplies. But...

There's about 50 zillion ways of designing a switching supply. Some
topologies do have this problem, others don't. Since this person
is interested in designing one rather than buying one off the shelf,
he can make sure it doesn't have the problem. If nothing else, he can
post-regulate with linear regulators or always have a minimum load
connected.
	
					Jeff Winslow