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  • Sven Greiner
  • rampinglight
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  • #3
Closed
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Created Dec 27, 2018 by Sven Greiner@SammysHPOwner

Increase PWM frequency

ToyKeeper said:

SammysHP: The PWM is fast on purpose. Slow PWM is really annoying to people who can see it. Like 2.5 kHz looks like a bad strobe light. I generally try to get it close to 20 kHz. High enough that people won't see or hear it, but no faster than necessary.

Currently this firmware uses ~2.5 kHz for better 7135 efficiency. Maybe this is too slow.

When increasing the frequency it is important that the on-time is above 8 µs so that the regulator can fully turn on. Maybe it helps to change the frequency together with the duty cycle.

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