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ISO7731-Q1: Enable voltage treshold

Geert Talens
Prodigy 20 points
Part Number: ISO7731-Q1
Other Parts Discussed in Thread: ISO7731

In the application I'm working on, I would like to enable the digital isolator using a soft start (RC) pin the controller on the primary side. For this I would be interested in the enable voltage threshold of the digital isolator. According to the datasheet, the input voltage treshold are at 0.6 x Vin typical. Is this also applicable for the enable pin? Or only for the regulator input channel pins?

Thank you!

  • +1
    TI__Mastermind 49445 points

    Hi Geert,

    Thanks for reaching out.

    The input threshold table that you are referring to in the datasheet is applicable for all input pins including EN pins. Hence, you can consider 0.6*VCCx (typical) as the answer for EN pin as well.

    I would also like to point out that these are logic input pins where the valid input signals are mostly going to be close to 0V (LOW) or 3.3V/5V (HIGH). Hence, the input thresholds are going to be a little relaxed (some variation) to keep the design simple. If your application needs the threshold to not have such variation then I recommend you to use a comparator separately. If such variation of input threshold is not a concern then you can go ahead and use RC directly with ISO7731. Thanks.


    Regards,
    Koteshwar Rao