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Original question:

UCC28950: UCC28950

UCC28950: UCC28950

Jacobo
Prodigy 225 points
Part Number: UCC28950

Tool/software:

Hello Mike,

Per my last question, the file I sent is done in TINA, the link for the UCC28950 has a Generic Spice file that is supposed to be used by other simulator besides TINA, Am I wrong in my assumption?

(please check your website if you have not done so: https://www.ti.com/product/UCC28950#design-tools-simulation)

So could you really please read my original message and help me with the problem at hand?

Have a good day

  • 0
    TI__Guru* 86266 points

    Hello,

     

    You should run the tina model in the tina simulator.  It does not work exactly like PSpice.  The PSpice model was debugged on TI PSpice.  I don’t know how it works LT Spice or other PSpice simulator.

     

    You had mentioned using other simulators; as well as, tina.  You seem to be having issues with all 3.

    I had recommended you started with debugged version of Tina or PSpice.  These models have the entire power stage and were debugged.  They are provided to save time in the engineers design, modeling and debug process.

     

    I then mentioned that you could use application note slua560d to check your paper design and modify the working model.  https://www.ti.com/lit/an/slua560d/slua560d.pdf

     

    I still recommend that you start with the unmodified version of tina or PSpice.  If you are using tina that is O.K.  Then run the model to get use it.

     

    The next step would be to modify the existing model based on application note slua560d and run the model.  Then if the model does not work, you have to debug the model to figure out why it is not working. 

     

    Possibilities for a model not working as expected.

    1. The paper design is incorrect
    2. The schematic does not match the paper design
    3. Models are not a perfect representation of analog circuits and sometimes components do not behave as expected.
      1. You can generally get around this by changing those components out or setting initial conditions of the components to fix issue.
    4. Initial conditions of components may not be setup correctly and the simulator has trouble running the simulation.
      1. This will generally show up as convergence issues, but not always.
      2. You will need to check each electronic component and see if there is something off.
        1. You can start with the working model and ratio values. This may save you time.

    Regards,