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INA250: TINA Model Output Not Matching Current Arrow

Prodigy 105 points

Replies: 4

Views: 140

Part Number: INA250

I am trying to run a simulation in TINA with the INA250. I have a current arrow (AM1) measuring current through the source of the FET (T1) and then the INA250 downstream of that. I would expect that the output of the current arrow (in amps) would be roughly half of the output of the INA250 (in volts) since the A4 variant puts out 2V for every 1A flowing through it. But, when I run the transient simulation, I get the current arrow outputting ~0.5A and the INA250 outputting ~0.025V.

What would be causing this issue?

You can see an image of the simulation and of the output waveforms below.

Thanks

-Tyler

  • Hi,

    can you post your TSC-file?

    Kai

  • In reply to kai klaas69:

    Hi kai,

    It should be attached below.

    General Breakdown: PWM -> Active Low Pass Filter -> Fet Driver -> Current Sensor

    Thanks

    -TylerCurrentSource.TSC

  • In reply to 0485680:

    Tyler,

    I have confirmed your issue and have not found the root cause.  I will continue to debug.  I believe it has to do with the startup condition as I was able to add a DC bias of 100mV to your PWM signal and it works as expected.  I will give you an update as soon as I can.   I plan on an update today or tomorrow.

    Best Regards,

    Javier Contreras, TI Sensing Products Applications Support

    Getting Started with Current Sensing Video Training Series

    All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and it is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).

     

  • In reply to Javier Contreras4:

    Tyler,

    I found another work around.  Change the conditions on the transient setup.  You will end up with the plot below.  Which has the current at about 510mA and and the current sensor output at about 1V.  I believe this will be more realistic on a start up condition.

    Best Regards,

    Javier Contreras, TI Sensing Products Applications Support

    Getting Started with Current Sensing Video Training Series

    All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and it is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).

     

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