Re: Edge response, dynamics, and really ugly time constants

I'm really confused. Looking at the waveform envelope it looks like
about 0.3 milliseconds between peaks of the fast ringing, 2
milliseconds (hard to tell, it's so damped) for the slow ringing..
That makes the ringing frequencies about 3 KHz and 500Hz, plus or
minus a lot.

If you're trying to stabilize the average level, you're looking in too
much detail. You need to look at the analog control voltage, not look
at the PWM switching transients.

Or I could be all wrong-- you just havent described the system or the
problem in enough detail.

But to answer your question, I've had the best luck at stabilizing
these kinds of transients with an ad-hoc 2-minute session with a R/C
substitution box.... Twiddle the knobs for least ringing and read off
the settings. Then wire in that 4.7K and 330pf series capacitor,
backnote the schematic, and nobody will know you didnt do a full
theoretical Laplace and Hamiltinian expansion. Works for me!

.