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LM5069: LM5069

Brian Anderson1
Prodigy 20 points
Part Number: LM5069

Problem with un-encrypted Spice Model

I have been trying to run this model using LTspice and Simetrix. Simetrex provides the following error: *** ERROR *** Model 'U1.X6.SMOOTH', parameter 'ron': Cannot evaluate expression 'RON'
Unknown parameter 'RON. And when I look at the spice model for the "smooth" model, I get .MODEL SMOOTH VSWITCH RON={RON} ROFF={ROFF} VON={VON} VOFF={VOFF}
.ENDS
I would like to know if I can comment this out, or get an upto date model

  • 0
    TI__Guru* 96001 points

    Hi Brian,

    Welcome to E2E!

    I will check and get back to you by early next week.

    Best Regards, Rakesh

  • 0 in reply to Rakesh
    TI__Guru* 96001 points

    Hi Brian,

    The error is due to the missing space after the PARAMS:. An additional space after PARAMS: will rectify the error. 

    PARAMS: RON=1 ROFF=1G VON=1.8  VOFF=1.7

    Please note that the existing unencrypted model on WEB works as expected in PSPICE. It gives error only in other simulators. The modified LIB file is attached here for your reference. 

    mod_lib file.zip

    Best Regards, Rakesh

  • 0 in reply to Rakesh
    Prodigy 20 points

    Hi, sorry for not getting back to you sooner.

    I have been running the model on Simetrix and everything seems to work and I'm happy with the model you provided. I also tried running the model on LTspice and when I want to trigger a shutdown LTspice stops simulating. I have been trying to do a comparison between the two simulations and they are different. My issue, is that I would obviously like to simulate my whole power circuit. So I'm caught between simulators, your model works on Simetrix and I can't get the spice files from LTspice over to Simetrix.

    I would just like to ask, does that sound correct, the updated model workd correctly on Simetrix but something in LTspice makes it hang up. I realise the difference in simulators is not your problem, but an expert opinion at this moment woul dbe helpful.

    As you can possibly gather, my preference is to use the LM5069, but because of time pressure I'm forced to look at alternatives.

    Thanks

  • 0 in reply to Brian Anderson1
    TI__Guru* 96001 points

    Hi Brian,

    Unfortunately, I cannot comment on LTspice as it is from our competition.

    Let me know if you have any other questions.

    Best Regards, Rakesh