At 03:41 AM 1/31/2005, Bob S. wrote:

>Only big problem I've seen for doing this circuit so far, is being able
>to generate a 48khz+ PWM using a PIC with fine enough resolution (I'd
>prefer 10 bit resolution, especially if you want to do the universal
>input).  Any simple/easy/cheap way to do that trick with a PIC?  Is
>there a SMPS control chip circuit that could be modified or tricked to
>do this (and could be controlled via a PIC)?

I'm pursuing an analog solution for my version - I've already got a dirt 
cheap technique for high frequency ramp and comparitor that I use in a 
couple of my other SMPS designs.  You could, of course, use generate the 
control signal from a PIC by using low frequency PWM and filtering that to 
near DC.

dwayne

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Dwayne Reid   <dwayner@planet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax

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