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OPA347: Comparator application: the risk of keeping switch IN+ and IN-

Part Number: OPA347

Hi Team,

Our schematic as below.

OPA347 would output high if MEMS_HEATER pull High. Then the negative feedback would pull low OUT pin.

So if MEMS_HEATER maintain High, OPA347 would keeping switch IN+ and IN-.

Are there any risk on this application? Which electrical characteristics should I notice?


  • Daniel,

    Expected output current will be [TP20]*100k/110k/1 with an error of VIO/1 where VIO can be as high at 7mV. An input of zero might result in no output current or upto 7mA.
    Because there is an extra component in the feedback path, stability should be verified.

    Why does the question title say "Comparator application"? This circuit is linear, not a comparator.