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LM25574-Q1: Simulation Model Error

Anjali Jacob
Prodigy 10 points
Part Number: LM25574-Q1
Other Parts Discussed in Thread: LM25574

There is an error showing while running the simulation model of LM25574-Q1. The error shows like ''Can't resolve .param SS={SS}''. Please support

  • 0
    TI__Genius 10665 points

    Hello, 

    Did you download the model from the LM25574-Q1 product folder? Or did you grab the model from within PSpice for TI? 

    I'm able to run the start up response simulation in PSpice for TI without this error message. 

    Please share your simulation files or else a screenshot of your schematic so I can review. 

    Regards,

    Harrison Overturf 

  • 0 in reply to Harrison Overturf
    Prodigy 10 points

    Hi,

    I have downloaded the LM25574-Q PSpice transient model. The problem is in the SS parameter in the model. When removing this SS parameter another error like too few nodes is showing. 

    Regards,

    Anjali Jacob

  • 0 in reply to Anjali Jacob
    TI__Genius 10665 points

    Hi Anjali,

    Thanks for the information. It looks like the external Parameters declaration did not get carried over which is probably why you are having this issue.

    Try setting SS = 0 to run a start up simulation and SS = 1 to run a steady-state simulation. For Steady state simulations, be sure to set the appropriate initial conditions for the input and output capacitors as well as the power inductor. 

    I'm including an example of what this looks like in PSpice for TI:

    Let me know if this resolves the issue. 

    Regards,

    Harrison Overturf 

  • 0 in reply to Harrison Overturf
    Prodigy 10 points

    Hi Harrison,

    Thank you for your support. I tried setting SS = 0 and SS = 1, but in both cases another error is showing up. The error shows "too few nodes". If you could, can you please share the LM25574-Q1 model.

    Regards,

    Anjali Jacob

  • 0 in reply to Anjali Jacob
    TI__Genius 10665 points

    Hello Anjali,

    Inserting the LM25574 Non-Inverting and Inverting PSpice Transient Model from the product folder. I verified that this model worked properly when I ran it (unmodified) using PSpice for TI. If you' re using a different spice simulator then you might need to add in an external "Parameters" definition like what is shown in the picture I sent previously. I'm not sure how this is taken care of in other simulators however. 

    snvm293a (1).zip

    Regards,

    Harrison Overturf