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INA205: INA205AIPWR

user6350528
Expert 1370 points
Part Number: INA205


During initialization, when the INA205 cmp1 reset pin is pulled high and cmp1 in has no input, cmp1 out outputs a high level

Can you see what the reason is, please

  • 0
    TI__Mastermind 32205 points

    Hello Appreciated Engineer,

    What is the input common-mode voltage (Vcm) at the shunt resistor?

    The most likely reason is that during the power up initialization, the 0.6V reference voltage is slow to ramp and/or there is a small, but fast output glitch at OUT. This creates a momentary Vout > Vthresh condition which trips the comparator.

    One way to confirm this is to probe CMP_IN+ and CMP_IN- (with respect to INA205 GND pin) during power up. You could also try removing C121 and C122 to see if this helps speed up 0.6V ramp time.

    Sincerely,

    Peter