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From: Boris Mohar
Subject: Re: buck switcher problem
X-Newsreader: Forte Agent 1.92/32.572
Date: Wed, 11 Dec 2002 13:55:05 -0500
NNTP-Posting-Date: Wed, 11 Dec 2002 13:56:23 EST
Organization: Bell Sympatico
On Wed, 11 Dec 2002 18:12:48 GMT, "Jeff" wrote:
>I have a power supply using a switching regulator that is supplied by a full
>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 frequency?
Try faster diodes.
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