Hi Wouter and all:

Wouter van Ooijen escribi=F3:

>I am a digital guy, how should I calculate that RC network?
>
>  =

>

I use the controls in an industrial very electricaly noisy environment. =

I've seen sometimes an rc of 12r and 1nF similar to other controls that =

some welding controls use, but I've not calculated these values,  they =

depend of the PWM frecuency.

Tired to see sophisticated circuits failing I'm testing the oulput =

circuit that Unitrode propose in the UC3637 application note, adapted to =

really work with 0-15 pwm pulses (UC3637 generated) and added four BYW29 =

diodes. As yours, this circuit allows to run at full power (speed) with =

a continous ON signal. Charge pump circuits don't allow this. It seems =

to work ok.

Best regards

Luis Izquierdo

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