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INA199: INA199 IC damag

Rock Shao
Expert 2820 points
Part Number: INA199

Hi,

My customer used the INA199, V+ is 10V, and +Vo and CN1 are the detection voltage difference.

At present, they often encounter the problem of IC damage. Is the current peripheral application correct?

  • 0
    Guru 140200 points

    Hi Rock,

    I'm sorry but with so little information it's nearly impossible to help.

    Please give a complete schematic (also showing component values !) and tell something about your application.

    The most often cause of damage is the occurence of negative going overvoltages at the input of INA199 exceeding the absolute maximum ratings. Overvoltages can be caused by inductive kickback, when an inductance (including cabling !) is suddenly turned-off. A wrong ground management can also be the cause of negative going overvoltages.

    Again, give us way more details. No details -> no help.

    Kai

  • 0
    TI__Mastermind 26750 points

    Hello Rock,

    Please provide more schematic and system information, including input common mode voltage and the load type.

    How does bus voltage (Vo+) change during operation? Are there any large transients?

    Check for any ground loops as well.

    Have you tried an ABA swap? This is where you swap the non working device from system A to a working system B. You also remove the working device from system B and you solder onto system A. Does the problem follow the device?

    Would you please explain what the failure mode looks like?

    Sincerely,

    Peter