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TINA/Spice/TPS65400: TINA "Transient" Model or "Average" Model on Web - Which is it?

Kurt Schmidt
Genius 11125 points
Part Number: TPS65400
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

The TPS65400 TINA model on the web says it is a "Transient" Model in the link and in the Macro notes. But in the notes for the TINA transient simulation (slvm03.tsm - also on the web) it says it is an "Average" model used to do Transient simulations. Then it goes on to say it doesn't show switching ...

In the past I have understood a "transient" model to include switching and be used for startup and load step/dump type sims while the "average" model is used for AC/BODE type analysis.

1) What is this model really - transient or average?

2) Customer wants to do both an AC/Bode analysis for stability and a load step response. Can we do these with this one model?

3) There is both a Transient and an Average model available for Pspice on the web. Per the conflicting information above which is which and what is it used for?

4) Can these PSpice models be made available in unencrypted form or can the missing model be made available in a TINA.tsm form? We would like to import both into TINA.

Thank you for as rapid a response as you can give this.

  • 0
    TI__Mastermind 39210 points
    Kurt,

    This transient model is an exception to the normally released transient model. You are able to run transient simulations on an average model, it just does not provide any switching, instead it shows the average waveform on any switching node. For example SW node will show averaged SW voltage which is equal to Vout. The advantage is that the simulation speed is very fast since the switching has been eliminated. This is a viable method to see things like loop stability with a load transient, but you can not see any cycle -by - cycle operation such as peak current limit, frequency of operation etc.

    We don't have a full switching transient model for this device.

    For unencrypted model, I will send you details internally.
  • 0 in reply to Nikhil Gupta (Product Folder Models)
    TI__Genius 11125 points
    Thanks for the rapid response and the additional info you sent by mail. So I'm still confused by one thing however. I think you are saying this is an Average model (correct) but that we are doing a transient simulation on it. So the transient simulation on the web is correctly named transient? But if it is really using an average model why are we still calling the model itself a Transient model (both in the description on the web and in the text of the macro itself)?

    Also, just to confirm - can I do a AC/Bode simulation with this model or not?

    Please call my cell to discuss in person if that is easier? Very much appreciated!
  • 0 in reply to Kurt Schmidt
    TI__Mastermind 39210 points
    Kurt,

    A transient model is one where you can run time domain simulation. Hence it has been named so.

    You can do the AC/Bode simulation with the Average Model on the web (the one that has been explicitly names Average model has already been setup for AC sims): www.ti.com/.../slvmai6 .