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Original question:

ISO7763-Q1: the damaged time when input high, output is short

ISO7763-Q1: Damaged inputs

Igor Orlovich
Prodigy 200 points

Part Number: ISO7763-Q1

Is there a spec for the maximum current the input diode structures can handle? Seeing some parts fail despite having sizeable series resistance on the inputs. During shutdown for a 100ms or so the input on the secondary side is around 0.5V while the power rail is off, but the current into the pin is in 70-150uA range at most. Despite that the pin ends up shorted to ground.
Secondly, is there way to get a quick design review to rule out any possible issues causing this?

  • 0
    TI__Mastermind 21365 points

    Hi Igor,

    Thanks for reaching out.

    From my understanding, the isolator device is getting some continuous current into the device input pin when the system is shutdown. you can certainly provide schematics for us to review. This will help us also understand your system more. Along with the schematic, can you also provide more information on how you are measuring this current? Can you also explain the operation of the isolator when the system is not in shutdown?

    Regards,
    Aaditya

  • 0 in reply to Aaditya V.
    Prodigy 200 points

    Is there a way to send schematic for review via DM/email? 
    The normal operation is just running 1-30khz pulsetrain  through the channels. The conditions described are during power up/shutdown and the current is measured by looking at the voltage drop across series resistor. So just looking at the abs max ratings of the IO pins ESD structures in these cases 

  • 0 in reply to Igor Orlovich
    TI__Mastermind 21365 points

    Hi Igor, 

    Email will be best. Feel free to click on my profile and find my email or you can DM me your email ID so that I can email you.

    Thank you also for the additional information. I will review these with my team and provide some information over email.

    Regards,
    Aaditya

  • 0 in reply to Igor Orlovich
    TI__Mastermind 21365 points

    Hi Igor,

    Thanks for DMing me. I will reach out to you over email.

    Regards,
    Aaditya