What exactly do you mean by "clamping the output"?  I actually need 0.5V=20
to 4.5V output, and Vdd will be 5V.  But I was looking for the A/D=20
feedback,etc for accuracy, since the PWM voltage output will be subject=20
to variations in Vdd.

Cheers,
-Neil.



On 4/12/2012 4:41 AM, Richard Prosser wrote:
> How about clamping the output PWM at a level a bit below the supply=20
> voltage? That would reduce the dependency. Just watch out for=20
> temperature variation! RP=20

--=20
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