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?

  • Machinist@lemmy.worldOPEnglish
    2·
    9 days ago

    The period is divided up into 32 pieces, instead of a 256 bit width, if that makes sense. So, the frequency is 20mHz/32 = 625kHz. 0b100000 / 0x20.

    Yeah, and with the load I’ll run, it’s not real critical. I just figure there has to be a name for this sort of tuning. If I know what it’s called, I can read up on it.