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So, I'm tinkering with the ATtiny 3224 and its PWM capabilities. I can get 256 bits of resolution per cycle at 78.125kHz.
If I drop to 32 bits, that gets me to 625kHz, as shown in the screenshot.
I've done some searching but I may not know the right term and I'm probably looking for a rule of thumb.
What sort of resolution do you need to regulate a DC/DC switch mode? (in this case a pure resistive load that doesn't change)
I think it might be something like a factor for required percentage of change of switch ON time. Such as, you should generally be able to modify your duty cycle by increments of 5% or 0.5% or whatever for proper regulation.
Does this factor have a name?
I think in the context of a switching power supply, this is just called voltage ripple. Generally it's measured as the amplitude and frequency of the noise relative to the target voltage.