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TPS2661: Spice model will not load into Tina

Carlo
Expert 7715 points
Part Number: TPS2661

Hi E2E,

Our customer is trying to load the spice model from the TPS2661 product folder. When they import the model they get the following message:

Invalid Device $CDNENCSTART_ADV2, line #71

$CDNENCSTART_ADV2

Is this because the model is encrypted? Do we have the unencrypted model for Tina TI?

Regards,
Carlo

  • 0
    TI__Guru** 104276 points

    Hi Carlo,

    It is encrypted. Please reach out on email for unencrypted model

    Thanks,

    Rakesh

  • 0
    Prodigy 70 points

    Thank you, when I load the TPS2661x_Trans I still get an error message, "Invalid Device $CDNENCSTART. Line #810 $CDNENCSTART. I renamed the file TPS26610 as instructed to do in the macro. Actually I am not sure it will answer my question about the TPS26610, as you have to select unipolar of bipolar Spice models.

    I am not clear from the TPS26610 data sheet if a bipolar supply is required for positive and negative current input. I am not sure if I bias the IN and out voltage above ground with a bias supply it will conduct +/-20mA ?. It appears this will work so long as the In and Out pins are within the supply range of the TPS26610 -Vs and +Vs. It only needs a -Vs if the current shunt is connected to ground ? Diagram attached. The current is measured across the 4R7 shunt resistor +/-20mA.

  • 0 in reply to Mark Betts
    TI__Guru** 104276 points

    Hi Mark,

    For bipolar inputs,  bipolar supplies (+Vs and -Vs) are needed otherwise the device will trigger input UVLO event and turns-off.

    As you are biasing IN and OUT above ground, it should work.

    Please get an EVM and evaluate before building the prototype and let us know if you have any questions.

    Can you share your application use case and end system details.

    Best Regards, Rakesh 

  • 0 in reply to Rakesh
    Prodigy 70 points

    Hi Rakesh,

    OK, As the IN and OUT are above GND (+1.65V) then the UVLO should not be triggered, and +/-20mA should flow.

    The User case is over voltage protection +/-30V miss wiring of a PLC +-/20mA input, for a universal IP analog module.

    The mA shunt resistor will be damaged by +/-30V over voltage miss wiring.

    Regards,

    Mark.

  • 0 in reply to Mark Betts
    TI__Guru** 104276 points

    Hi Mark,

    Thanks for the details.

    OK, As the IN and OUT are above GND (+1.65V) then the UVLO should not be triggered, and +/-20mA should flow.

    Rakesh->Correct.