Hi,
I need some help with the CMPSS . I am using F28337D controlcard and I have configured some comparators to trip the PWM modules.
My issue is that when the comparator input is zero or negative (some mVs due to an offset of my rest circuit), either the comparator's trips are not stable (the resultant duty cycle is not constant) or it doesn't trip at all. If I increase the input value to 10mV, everything works fine. The ADC result in both cases is as it has to be (close to zero). My question is how the comparator behaves in such cases, when the input is either close to zero (with some noise) or negative? I would expect the same behavior with that when the input is positive. One possible reason may be that the output of comparator is forced to gnd in that case.
I am sure that someone can answer my question because I know that I am missing something.
Thank you very much.
Regards,
Panos