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ISO3082: ISO3082 output floating ground

Paul Ren
Prodigy 640 points
Part Number: ISO3082

Hello

My customer has designed a system with 6 node of ISO3082. The GND of each bus side is not connected to each other. Will the float GND cause any damage to ISO3082? 

Customer recently report high failure in end customer field. The major failure symptom is the GND1 and GND2 is short. Please suggest the possible cause of such damage. 

Thanks!

Paul

  • 0
    TI__Genius 17100 points
    Hi Paul,

    If different voltage potentials are connected on each GND1 or GND2 pin of the same side, the isolator can be damaged. However, is the setup above such that only one or two of the GND pins is connected and the others are left floating?

    The isolation barrier of our devices may be compromised by overvoltage stress on Vcc pins. This could be caused by transients in the supply or possibly by the floating GNDs.

    Please let us know where our customer expects transients in this system and how all of the ground pins are connected.


    Thank you for posting to E2E!

    Manuel Chavez
  • 0 in reply to Manuel Chavez
    TI__Genius 17100 points

    Hi Paul,

    Just to follow up on my response, the GND pins on one side of the ISO3082 not being connected to the GNDs of the opposing side of the isolator will absolutely not cause GND1 to GND2 shorts. A short between GND1 and GND2 is likely due to a very high voltage difference between the two sides of this device.

    May I email you for more information and details about the application?


    Thank you for your time,
    Manuel Chavez

  • 0 in reply to Manuel Chavez
    TI__Prodigy 640 points
    Hi Manuel,

    The customer application is that the A/B of 6 pcs of ISO3082 are connected to the bus, however, the GND2 of each device are not connected together. I think this kind of connect will not cause damage. Is that right?

    Yes, we can discuss it through E-mail.

    Thanks!

    Paul
  • 0 in reply to Paul Ren
    TI__Genius 17100 points
    Hi Paul,

    From my understanding so far, it seems a voltage transient or overvoltage stress would damage the devices.

    Since we have not received a response from you via email, this thread will be closed. Please feel free to re-open it by responding or create a new thread using the yellow and red buttons in the top right corner of this window.


    Thank you for posting to E2E!
    Manuel Chavez