MOSFET control using PWM & 16C711?

[NavMicroSystems]

If you have followed the hints penelopepug has given
and if you are wondering why your FET is dissipating that much heat
when using PBP's PWM instead of HPWM:
scope the output and the aswer will be on your scopes screen.

[mister_e]

I feel it's the way PBP produce the PWM. I feel they switch the pin direction from output, input and then output... i didn't check the PWM assembler source but i remember few user PMs about problem at the end of a PWM execution. With a LED(s) attach to the PWM pin(s),In some case the output state was set to high, sometimes low, sometimes XYZ=> wich looks more than a pin set to input.

Problem was fix when setting the PIN to output and LOW after the execution of PWM.

I prefer to stick with timer interrupt or HPWM(if i don't need many channels)

[NavMicroSystems]

Hi Steve,

your findings match my findings which results in: "DON'T USE PWM" (in terms of PBP's Software PWM)