Mike Singer wrote:
>
>  Has anybody any suggestions of max regulated frequency?
> If I replace bottom resistor of feedback chain by digital
> potentiometer and reduce output capacitor, what "max
> frequency" very aprox could I send to digital potentiometer,
> aiming at microstepping motor applications?
> LM3485 can work at >1mhz.


A good rule for PWM is 10:1. So if your PWM freq is
1MHz, (as above) you should not try to accurately
simulate changing waveforms over 100kHz. Even 10 PWM
cycles will cause significant ripple as you can't use
large filter caps. 50:1 is better.
-Roman

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