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TINA/Spice/TPS57140-Q1: TINA/Spice/TPS57140-Q1

Thomas Dexter
Prodigy 10 points
Part Number: TPS57140-Q1
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

I am trying to run the unencrypted SPICE model for the TPS57140-Q1. The problem I have at present is that when the model is loaded and a symbol created for it, the model will run but there are currently two issues with the model.

1) The model runs very slowly

2) The model appears not to have the correct output in that it is low.

I had to make use of the PWRGD output and the DUMMY_TEMPIN pins. I understand that the PWGD pin is an open drain output, so what would you think is appropriate here? I temporarily put a pull-up resistor to a 3.3V supply. the DUMMY_TEMPIN I put to a 20V source, on the basis this may be read as 20degC. I originally grounded both of these inputs and the model ran.

I have checked the complete circuit. I have even only chosen 1 waveform to save and graph, but still the model runs slowly or there is a 0V output. I have also tried reducing the output smoothing capacitance. Unfortunately it takes so long to run, it is not possible to check the output later and it is not possible to see if it springs into life later or not.

Can you advise what could be the problem please?

  • 0
    TI__Intellectual 835 points
    Hi Thomas,

    The Pspice model released to web takes around ~28 minutes to run for a simulation time of 1.2ms on a 4 core system running with a processor at 2.8GHz clock.
    Are you running the released testbench and still facing slowness of much more than 28 minutes? In that case, the possible reason could be the system specifications at your end.

    Or, have you made some modifications to the model? In this case, please share the project with us in .zip format so that we can have a look at it and help you.

    Regarding your questions about pin connections, PWRGD pin is open-drain output pin and can be connected to any high potential (say VOUT,
    VIN, etc ) via a resistor. However, I do not see the DUMMP_TEMPIN pin in the released model and hence can't comment on it.

    Thanks & Regards,
    Abhisek