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ISO124: Will the secondary side be affected when the primary side is broken

Wayne Wang20
Expert 4410 points

Part Number: ISO124
Other Parts Discussed in Thread: ISO224

Hi team,

My customer is evaluating our ISO124. I noticed that in our datasheet, the maximum input voltage of the primary side is 100V. So when there is a transient voltage that is higher than 100V applied to the input, I assume the primary side will be broken. My question is that when the primary side is broken by the high input voltage, what will happen on the secondary side—can it be kept safe? Thanks.

Best regards,

Wayne

  • 0
    Guru 140200 points
    Hi Wayne,

    well, it cannot be excluded that the barrier becomes damaged, too. It depends on what is really going on during the damage. Is it a very brief period of overvoltage or is it a long lasting barbecuing of the whole chip...

    I would avoid any risk and protect the input side against overvoltages.

    Kai
  • 0 in reply to kai klaas69
    TI__Guru 60242 points
    Hi Wayne,

    As Kai mentioned, it greatly depends on the extent of the damage. The input may need to be protected with diodes to avoid being damaged by such transients. Additionally, if you have not seen the ISO224, it may be worthwhile to take a look at.