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LMH6642: About the phenomenon that a short occurs

Y.Ottey
Mastermind 6145 points
Part Number: LMH6642

Dear all,

I would like to ask a question about LMH6642.

If a short circuit occurs between the V (-) pin (No. 2 pin) and the + IN (No. 3 pin) pin, what phenomenon is considered to be caused by the cause?

As one of the conceivable cases, it can be assumed that a voltage exceeding −0.8 V is inputted to + IN when V− is 0 V (GND). Could you tell me if there is anything else?

Best Regards,

Y.Ottey

  • 0
    TI__Expert 7875 points

    Hi, 

    The LMH6642 can receive inputs all the way to the negative supply, so it should not do anything to the input connection. Depending on the rest of the circuit setup, it may cause the output to saturate. 

    Regards, 

  • 0 in reply to Jacob Freet
    Mastermind 6145 points

    Hi Jacob,

    I would like to ask more questions.

    If a voltage of 0.8V or more is input to the IN + pin when the voltage input to the V + and V− pins is 0V, will a short circuit occur between the IN + and V− pins?

    If this does not happen, what can be guessed why the ESD protection element between the IN + and V− pins is broken?

    (Please let me know if anything other than EOS)

    Regards,

    Y.Ottey

  • 0 in reply to Y.Ottey
    Mastermind 6145 points

    Dear Max,

    Thank you for your reply.

    I need to know the answers above quickly

    I would appreciate it if you could get back to me right away.

    Regards,

    Y.Ottey

  • 0 in reply to Y.Ottey
    TI__Expert 7875 points

    Hi, 

    Was your last reply to a different thread? Sorry, I do not understand the context. 

    To answer your previous question, the ESD diode between V+ and V- should only turn on if V+ is brought approximately 0.8V below V-, otherwise you will not see the diode. This scenario does assume that the part is powered on when testing. 

    Regards,