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XTR111 overvoltage protection

Guenter Fettig
Intellectual 1540 points
Other Parts Discussed in Thread: XTR111

XTR111 will be tested for Current/Voltage output, referring to Fig.48 in DS. Can you please suggest a feasible overvoltage protection for pin 7 (SET). In fault condition or miswiring, end customer can apply a voltage >14V to pin 7 that could be destructive.

Thanks for feedback !

  • 0
    TI__Genius 12325 points
    Hi Guenter,
    My first thought on this would be a zener diode in parallel with Rset. I would pick a zener clamp voltage below 14V but above the maximum input voltage. 12V might be a reasonable voltage. However, the zener will need to be sized to handle the maximum current which could flow in a fault condition. I'm assuming the customer is worried about the loop supply being connected to this pin, and the maximum current that the loop supply is able to deliver will determine how large the Zener diode needs to be.
  • 0 in reply to John Caldwell
    TI__Mastermind 27715 points

    Hello Guenter,

    I agree with John's recommendation.

    I would also like to let you know that our new TI Precision Labs material has a series on electrical overstress (EOS) which provides recommendations for selecting protection components such as current-limiting resistors and clamping diodes. Part 2 and 3 of the EOS series are the most directly applicable to your question.

    Best regards,

    Ian Williams
    Linear Applications Engineer
    Precision Analog - Op Amps