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Strange behavior comparator hysteresis - solved

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David Hess:

--- Quote from: HendriXML on July 30, 2020, 09:20:38 pm ---I lowered the capacitor to 47 pF. This is just enough, 100 pF would be better.
--- End quote ---

I usually does not take much more than the parasitic capacitance which is causing the problem.

Comparators really need to be used with low impedance sources.  You also might notice that many comparators use an alternative pinout which routes the output away from the inverting input and closer the non-inverting input which is the opposite of an operational amplifier.

HendriXML:

--- Quote from: David Hess on July 31, 2020, 01:42:15 am ---
--- Quote from: HendriXML on July 30, 2020, 09:20:38 pm ---I lowered the capacitor to 47 pF. This is just enough, 100 pF would be better.
--- End quote ---

I usually does not take much more than the parasitic capacitance which is causing the problem.

Comparators really need to be used with low impedance sources.  You also might notice that many comparators use an alternative pinout which routes the output away from the inverting input and closer the non-inverting input which is the opposite of an operational amplifier.

--- End quote ---

Nice info, I always wandered why the layout wasn't optimized for ease of routing.

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