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From: "The Al Bundy"
Subject: Re: buck switcher problem
Date: Wed, 11 Dec 2002 20:02:52 +0100
Organization: @Home Benelux
NNTP-Posting-Date: Wed, 11 Dec 2002 19:02:36 +0000 (UTC)
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
"Jeff" schreef in bericht
> I have a power supply using a switching regulator that is supplied by a
> wave bridge rectifier and a stepdown transformer. The surprising thing is
> that the power supply caps are getting hot.
> The values for capacitance and ripple current are all within the
> calculations, but there is a large temperature rise on the caps. The
> regulator vendor says it is a problem with the 300 kHz switching frequency
> and aluminum electrolytic.
> They suggest doubling or tripling the caps or using tantalums (expensive!)
> that are rated for the higher frequency.
> Any other advice? Is it ok to use aluminum electrolytic at this
I guess you need some low ESR caps, the series resistance generates the
heath. So if this resistance is high the cap will get hotter then caps with
a low resistance.
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