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TPS22920: TINA transient analysis

Kazuhiko Hirano
Genius 13948 points
Part Number: TPS22920

Hello,

 

My customer is facing a couple of issues at TINA transient analysis as follows.

At TPS22920_old_sch.tsc, VIN oscillates as framed with RED circle.What’s wrong?

TPS22920_old_sch.tsc

And at TPS22920_new_sch.tsc, my customer gets the following error when load R2>5ohms.

What’s wrong?

TPS22920_new_sch.tsc

Best regards,

 

K.Hirano

  • 0
    TI__Genius 13690 points

    Hi Hirano,

    Welcome to E2E!

    In the old schematic one mistake I see is that they have VIN connected directly to the ON pin of the device. I attached an RC delay to the old schematic an acquired the following behavior.

    For new schematic follow these steps:

    1. On the Analysis tab go to Set Analysis Parameter

    2. On the bottom right corner click on the hand and select open.

    3. Find the Transient Convergence Solutions.PRM file and open.

    4. Select okay.

    Analysis should be able to run.

    Let me know if you have any questions.

    Best regards,

    Andy Robles

  • 0 in reply to Andy Robles
    TI__Genius 13948 points

    Andy,

     

    Thank you for your responses.

    My customer was able to solve the issues, but still has a new question.

     

    At the TPS22920_new_sch_1st.tsc, my customer deleted U2 once and then undo it, TPS22920_new_sch_2nd.tsc.

    Then he got an error as follows. He just delete U2 and undo it, so the two .tsc files should be identical. Why he got the error? What’s wrong?TPS22920_new_sch_1st.tsc

    TPS22920_new_sch_2nd.TSC


    Best regards,

     

    K.Hirano

  • 0 in reply to Kazuhiko Hirano
    TI__Genius 13690 points

    Hi Hirano,

    When the component was deleted something within the code must have changed, and when they undid the deletion the code might've not updated the same way. Did the customer do anything else after they deleted the component?

    When I open the file that works and try to recreate what the customer did I do not get the same error that the customer is seeing. In my case when I undo the deletion the simulation still works fine. I only see the error when I open the second model attached, so there has to be something different within the codes of the simulations.

    Since the first simulation still works fine I would discard the second simulation and continue tests on the first file.

    Best regards,

    Andy Robles

  • 0 in reply to Andy Robles
    TI__Mastermind 27715 points

    Hi Hirano, Andy,

    I have seen this before. This is caused by the "Post-processor" tool. When you deleted and re-added the component, the post-processor lost its reference to the nodes of that component. 

    You can fix this by deleting all curves from the Post-processor window and then re-running the simulation. I did this on the attached file and the error goes away. Unfortunately you will have to set up any post-processed curves again.

    TPS22920_new_sch_1st_fixed.TSC

    Best regards,

    Ian Williams
    Applications Manager
    Current Sensing