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Original question:

TPS3702: TPS3702CX12 unencrypted SPICE model request

TPS3702: Simulation of TPS3702CX12

Thomas Eckstein
Prodigy 65 points
Part Number: TPS3702


Tool/software:

Hello,

I would like to perform simulations for the TPS3702CX12 voltage supervisor IC.

On TPS3702 data sheet, product information and support | TI.com, the model provided is for the TPS3702CX33 IC with different threshold voltage levels.

Is there a possibility to simulate the behavior of the TPS3702CX12 (e.g. by adjusting some parameters of the TPS3702CX33-model)?

Thanks for your help!

Best regards,

Thomas

  • 0
    TI__Genius 10340 points

    Hi Thomas, Thanks for your question!

    I will check with my team and get back to you by the end of this.

    Normally one threshold is enough to understand the device behavior. Could you please let me know why do you need 1.2V variant? 

    Best Regards,

    Sila 

  • 0 in reply to Sila Atalar
    Prodigy 65 points

    Hi Sila,

    could you find out something new regarding the simulation model of the 1.2V variant?

    I need the 1.2V variant because of my application where I need those threshold levels.
    I would like to perform Monte Carlo simulation to take into account component tolerances and see if the voltage supervisor still works as expected.

    Best regards,

    Thomas

  • 0 in reply to Thomas Eckstein
    TI__Genius 10340 points

    Thanks for the clarification Thomas!

    I recommend using current pspice model first to see if you are getting the result you are looking for. I'm not fully sure if the model can provide  the accurate data. 

    If you like the result, we can see how we can get the model to work with 1.2V variant instead of 3.3V. Our expert is expected to be back in early June. 

    I can provide some updates later, but please feel free to share your feedback whether the simulation data is good for Monte Carlo. 

    Best,

    Sila 

  • 0 in reply to Sila Atalar
    Prodigy 65 points

    Thanks for letting me know when to expect an answer from your expert!

    Following your message, I tested the model of the 3.3V variant.

    In this case, the behavior matches the voltage-threshold from the calculations with deviations of about 5%.
    In the calculations, I used the voltage thresholds as specified in the datasheet and took into account the sense current.
    Maybe the simulation model considers more influences which explains the deviations.

    Monte Carlo analysis can be done with this model which makes it possible to see how the voltage thresholds vary with component tolerances.

    Thus, it would be nice to be able to perform the same simulations with the 1.2V variant to validate the specific design.

    Thanks,

    Thomas

  • 0 in reply to Thomas Eckstein
    TI__Genius 10340 points

    Hi Thomas, Thanks for sharing your result. It's good to hear that simulation was helpful. 

    As I mentioned, I will provide feedback once I get some feedback. 

    Best, 

    Sila 

  • +1 in reply to Sila Atalar
    TI__Genius 10340 points

    Hi Thomas, 

    Thanks for your patience. I was able to get some feedback regarding how we can update the threshold value.

    Please find the main steps you need to follow in below. 

    1.Download the current PSpice model from TI.com.  Open the  Altium library file -> open with notepad
    Update vref and vref1 values. (This will be the threshold for OV and UV). Save your changes. (This updated .lib file will need to add in library.)

    2. Open PSpice model editor to generate the OLB file.

    • Since you have a .lib file: You can use a tool like the PSpice Model Editor's "Export to Capture Part Library" function to generate the .olb file from a .lib file. The .lib file typically contains the model information for the component, while the .olb file contains the symbol information.

    Generate export the capture -> OLB file

    Next step is updating  the model libraries. I think you should be able to drag the updated files into the folder. 

    The main part was knowing which value needed to be updated, and I learned that it should be VREF and VREF1 from our expert.

    Hope this helps!

    Best, 

    Sila Atalar 

  • 0 in reply to Sila Atalar
    Prodigy 65 points

    Hi Silar,

    Thank your very much for your helpful answer!

    I can confirm that the model behavior now closely matches what is expected out of the calculation.

    Thanks,

    Thomas

  • 0 in reply to Thomas Eckstein
    TI__Genius 10340 points

    Hi Thomas, 

    Happy to help!

    Best,

    Sila