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Original question:

LMR36503: Can't make the PSPICE model work

LMR36503: SPICE simulation doesn't work

Aurelie Duval
Prodigy 150 points
Part Number: LMR36503

Hello,

I have the same problem as other users, the simulation takes forever (I actually never see the end of it).

I have change the run time to 1m, the Gmin to 1e-007 and the maximum timestep to 10u but it doesn't change anything.

Is there a problem in the model?

Best regards

Aurélie Duval

  • 0
    TI__Mastermind 35210 points

    Hello Aurélie,

    Which schematic are you running and did you make any edits to it?

    The startup and steady state schematics often don't take too long with modern PCs. 

  • 0 in reply to Marshall_Beck
    Prodigy 150 points

    When I stimulate the example which can be downloaded on TI website:

    - BUCK_STARTUP

    - BUCK_STEADY_STATE

    - IBB_STARTUP

    - IBB_STEADY_STATE

    It works but I need to custom them. A lot (line and load variation). So I wanted to start a schematic from 0 but it doesn't work.

    I also wanted to do it on LTspice rather than on Pspice.

    Best regards,

    Aurélie

  • 0 in reply to Aurelie Duval
    TI__Mastermind 35210 points

    Hello Aurelie,

    I think we would be better off trying to get bench data for line/load reg. On the additional e2e post you have which I replied to, I mentioned that I was going to see if a colleague can obtain this data for us. I would recommend waiting to see if that data I am working to get will fulfill your needs.

    I think you will have a challenging time getting the encrypted spice model to work in LTSPICE.