Look at national's lm2576 simple switchers. They have an app note that shows
a pot controlled 1.2 - 40 v supply. I would think it would be relativly
straitforward to influence the feedback loop with an opamp, which you should
be able to control with a DAC or integrated PWM.

-Denny





> > microsoftwarecontrol wrote:
> >
> > >I really need do so for a range of 2v-14v and at current 2A at least.
> > >
> > >otherwise I need to go with linear voltage regutlator, that heats up
> > >so much.
> > >
> > >
> > >
> > I have done this sucessfully, but there are limits to the range. Is this
> > a DOWN switcher (raw DC in > 14V)
> > or an UP switcher (raw DC approx 1.5V).
> >
> > As a rule, I never use linear regulators anymore. Once you have been to
> > Paris, you'll never want to go back
> > to the farm.
> >
> > --Bob
> >
> > --
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