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From: "Graham Holloway"
Subject: Re: Low power SMPS with good Power factor
Date: Thu, 26 Sep 2002 10:47:58 +0100
References: <firstname.lastname@example.org> <3D92D0BC.90C30D0D@autometer.de>
NNTP-Posting-Date: Thu, 26 Sep 2002 09:51:50 +0000 (UTC)
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If you *must* have PFC and are prepared to accept 100Hz ripple on the output
you can operate a flyback with no or a very small input capacitor. It is not
as straightforward as it would seem and there are significant compromises to
"Tilmann Reh" wrote in message
> Which topology should I use when I want to develop a low power OFF line
> SMPS (230Vac to 16Vdc, 25W with galvanic isolation), with low hamonic
> distortion. (EN61000-3-2 C)
> For cost reason, I would not like to build a two-stage power supply like
> PFC + Flyback.
> Can I use a sor of PFC - circuit (an extra winding on the choke) to pull
> out the power?
> Is there a passive sollution (no 50Hz chokes, the are too big)?
There are some pretty chips out there for small power flyback
applications. And for 25W you don't need PFC.
Look what Philips or TI can offer...
Dipl.-Ing. Tilmann Reh
Autometer GmbH Siegen - Elektronik nach Maß.
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