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INA302: AC current sensing

Part Number: INA302

HI TI,

I need over current protection for AC.

Please refer to below block.

My concept is disconnect from ac line when the current flow above the threshold i set. (2A)


You can also suggest another solution without an opto-coupler.

  • Hello Mason,

    Thanks for considering to use Texas Instruments.  So if I understand correctly you want circuit behavior like the first figure below.  I think you may need to modify your circuit to the second figure as in your implementation above no current passes through the LED when OC has not triggered as the alert pin is high.  Since no current passes through the LED before OC is detected, the switch diodes will also be off.  For your reference, the operation of the ALERT pin in transparent mode is posted below in figure 3.

  • Thank you for your kindly support.
    It's exactly what I want to know.