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I'm trying to model a simple PWM and get this error.
I've seen it before with zeners. The thing that is interesting is that with the pot set at .5 it runs (10K pot), but at .8 or so it fails.
Any ideas??
I frequently get the 'time step too small' error in my sims. As you found, changing a component value sometimes cures it.
I'd be interested to know if there's any setting in Control Panel which can increase the time step and guarantee a fix? I've no real understanding of what most of the settings do (e.g. Stol, MinDeltaGmin ...) although I tinker with them sometimes in a vain attempt to unstick a sim.