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INA186: Current tracing in simulation

Hiroyuki Uesugi
Prodigy 110 points
Part Number: INA186


Hello.
INA 186A simulation.
The simulation did not converge.
As a countermeasure, the parameters for ITL1, ITL2, and ITL4 were changed.
This would reduce the number of points that can be traced.
I would like to trace the current, what is the solution?

Thanks for your help.
Best regards.

INA186A5_2.zip

  • 0
    TI__Mastermind 35550 points

    Hi,

    Please add a voltage probe to the output pin:

    If you continue to have convergence issues, try disabling initial bias calculation:

    Here is what the output should look like: 

    Regards, Guang 

  • 0 in reply to Guang Zhou
    Prodigy 110 points

    Hello

    Sorry, your answer is a mismatch between what I want to ask and what you are asking.

    Voltage probes can be installed. But current probes cannot be installed.

    If the parameters ITL1, ITL2, and ITL4 are initial values, there is no convergence.

    I have tried the options you advised but no change, there is no convergence too.

    I have changed the parameters ITL1, ITL2, and ITL3.

    Then the simulation can be done. And the voltage can be probed. But the current cannot be probed.

    I removed the INA186 for a test. Then I connected V1 and R2.

    Run a simulation.

    Naturally, the voltage will be 3.3V.

    But the current is not on the trace list.

    Reset the values of ITL1, ITL2, and ITL4 to their default values.

    Then rerun the simulation.

    The result is of course the same.

    But the current can be traced.

    I would like to probe the current in the INA186A5 simulation.
    And I want to know why the probing point is limited when I change ITL1,ITL2,ITL4.

    Thank you for your help.
    Best regards.

  • 0 in reply to Hiroyuki Uesugi
    TI__Mastermind 35550 points

    Hi,

    Thank you for the detailed description, now I get what the ask was. The issue looks to be tool-related, not INA186-related.

    My guess is that there are certain limitations with  PSpice for TI, since it is a free software. However, I’m not sure where the limits are drawn. It would be interesting if you could gradually decrease the values and see when the tool starts to save current data again. In the meanwhile, I’ll do some research to see if I can find some answers.  

    Regards, Guang