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Could ISO7421 be used in the PMP8896 TI design?

Jason Work
Genius 10830 points
Other Parts Discussed in Thread: PMP8896, ISO7421

What would be the tradeoff to use the ISO7421 in the PMP8896 instead of optocouplers?

Related forum post:
Could TPS23753A be used with ISO7421 instead of optocouplers?

  • 0
    TI__Mastermind 21336 points

    Hi Jason,

    If you are looking at U3 is the reference design, you will not be able to replace it with the ISO7421 without making many more changes to the reference design.

    U3 is feeding back an analog voltage across the isolation barrier. This signal is proportional to the output voltage at TP3, and is seen by the CTL pin on U2 as an analog voltage. The ISO7421 is a digital isolator and therefore would not be able to send proportional feedback and only, high or low signals.

    Thanks,

    John