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how much current from RS422 output.

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Discussion in 'General Electronics Discussion' started by HellasTechn, Dec 24, 2019.

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  1. Dec 24, 2019 #1
    HellasTechn

    HellasTechn

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    Apr 14, 2013
    Hello everyone and Merry christmas.

    I have this strange question. In the past i accidently shorted the rs422 output of a driver chip and it got damaged. can i avoid it by placing a fuse in serries ?
    how much current can a typical rs422 driver deliver before it gets damaged ?
    I try to figure out if i can protect an rs422 driver from being damaged due to short circuit with ground.

    Thanks alot !
     
  2. Dec 24, 2019 #2
    Nanren888

    Nanren888

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    Nov 8, 2015
    Not really an expert at RS422, but Google is a really helpful guy to have round.
    https://www.electronics-notes.com/a...data-communications/rs422-basics-tutorial.php
    Says RS422 specifies an output current of 150mA

    The fault protected MAX14775 says it protects at 200mA.
    The MAXM22510 says it has an output short circuit current , min 30mA, max 250mA (@12 volts supply)

    Seems the popular answer on the hits I got was "buy our output protected devices". :(
     
    HellasTechn likes this.
  3. Dec 24, 2019 #3
    HellasTechn

    HellasTechn

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    Apr 14, 2013
    Hmm that looks helpful. I thought it would be around 50ma. TI pdf's also state 150ma max driver short circuit to gnd current.

    What about rs232. Havent found anything yet.
     
    Last edited: Dec 24, 2019
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