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Output to input protection

Discussion in 'Electronic Design' started by Marco Trapanese, Mar 17, 2013.

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  1. Il 17/03/2013 19:51, Jim Thompson ha scritto:

    Hi Jim!
    Let's suppose the VSHDN is pulled down to 0V. The circuit is off.


    Well, I was afraid about the mosfet body diode: if I have a voltage at
    output and 0V on the input will it turn on? Even the IC is in off condition.

    Marco
     
  2. Il 17/03/2013 20:15, Jim Thompson ha scritto:

    Exactly!
    I'm sorry again for my poor English!


    LOL :)

    In the first case I solved placing another diode at the input so there
    is no return path.

    For the second chip.... I found another one:

    http://www.farnell.com/datasheets/608802.pdf

    which is designed to avoid the problem.

    Marco
     
  3. Il 17/03/2013 20:34, Jim Thompson ha scritto:

    Good point. Anyway I changed a bit the connections and I avoided the
    problem at all.

    Thank you again, Jim.

    Marco
     
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