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TLV2401-Q1: Missing PSPICE Model

David Fishman
Intellectual 485 points
Part Number: TLV2401-Q1
Other Parts Discussed in Thread: TLV2401,

Tool/software:

Hi,

I tried simulating TLV2401 in LTSpice using the available SPICE model on the TI web page. The model behaved in strange ways, so I downloaded PSPICE for TI.

Unfortunately, the model for the TLV240x OpAmp is not included.

Does someone have a suggestion?

Thanks,

d

  • 0
    TI__Guru* 77541 points

    Hi David, 

    David Fishman said:
    I tried simulating TLV2401 in LTSpice using the available SPICE model on the TI web page.

    I am unable to support TLV2401 in LTSpice simulation. But I know that our model should be able to import into the another Spice simulator, including LTSpice. Please see the PSpice library in the thread below. 

    https://www.ti.com/product/TLV2401-Q1#design-tools-simulation

    Here is the TLV2401-Q1's Tina simulation. The simulation is an old Spice model file, but it should work for simulating a basic functionality. 

    TLV2401 Simulation.TSC

    If you have other questions, please let me know. 

    Best,

    Raymond

  • 0 in reply to Raymond Zhang1
    Intellectual 485 points

    Raymond,

    Thanks for responding.

    My circuit is shown below.

    I can not understand why the simulator is showing a 6.84V output when the power supply is 5V.

    This behavior was observed also with LTSpice.

    Thanks, Dave

  • 0 in reply to David Fishman
    TI__Guru* 77541 points

    Hi David, 

    The Spice model is fairly old and does not have certain protection that modern op amp does. 

    At the same time, you are doing a weird thing as well. Why are you limiting the 5Vdc supply voltage with 2.21kohm resistor - which the model does not know what to do? Yes, Vout can not exceed the supply rail voltage, and the Spice model is not perfect. 

    Best,

    Raymond

  • 0 in reply to Raymond Zhang1
    Intellectual 485 points

    Hi Raymond,

    The current limit is a high reliability design practice. If there is a power-to-ground short, the +5V supply would not be shorted, taking down the entire sub-system. 

    Do you know of any workaround?

    Thanks, 

    Dave

  • 0 in reply to David Fishman
    TI__Guru* 77541 points

    Hi Dave, 

    I see. The Spice model is too old and does not have the modern simulated features in the model. Yes, this is a low cost and effective solution. For simulation purpose, you can remove it and place 100s ohm for simulation purposes. 

    David Fishman said:
    Do you know of any workaround?

    Typically, I would limit the current of the 5Vdc, but it may cost more for automotive application. Automotive method tends to be low cost and effective. By placing a current limiting resistor at the 5Vdc supply rail, it will meet the requirements (except the Spice model may not like it, the current limiting resistor value is interacting with the op amp's output). 

    If you have other questions, please let me know. 

    Best,

    Raymond

  • 0 in reply to Raymond Zhang1
    Intellectual 485 points

    Thank you very much for your helpful suggestions.

    Dave