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TLV9041: Pspice simulation error

Vishrut Dave
Prodigy 40 points
Part Number: TLV9041
Other Parts Discussed in Thread: TLV9042

Tool/software:

Hi,

 I'm trying to simulate High-side current sensing OP-AMP circuit as per snapshot & PSPICE design file attached. Simulation runs smoothly without any errors & as per expected Output voltage when Power Supply(V2) to Op-AMP is 3.8VDC. But when I reduce V2 to 1.8VDC then it throws Bias point related error.

  

Does it mean that this Op-amp will have a similar issue in real-time operation at 1.8V as well?? If there is a way to bypass this simulation glitch(if it is a glitch in the first place) then please suggest how to modify Pspice simulation profile. I've already tried "Auto-converge" option but didn't make any difference.

  • +1
    TI__Genius 12135 points

    Hi Vishrut,

    Any way you could share with me your simulation file?

    When you power the device with 1.8V, your inputs are above the input common mode range of the TLV9042:

    The input bias currents also increase due to forward biasing of the input ESD diodes:

  • 0 in reply to HO SIU
    Prodigy 40 points

    Thanks Siu, for your insight into this key detail. After posting this question, I noticed that my circuit would work on 1.8V supply if the topology is Low-side measurement. Although it won't work the same way if the topology is "High-side current measurement". Thanks for the detailed insight & information.