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Original question:

LM5180-Q1: the Loop stability issues of LM5180-Q1

LM5180: SIMPLIS model to make stability analysis

Lionel U
Prodigy 60 points
Part Number: LM5180

Hello

I need the simplis model of the LM5180

As answered here https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1118687/lm5180-q1-the-loop-stability-issues-of-lm5180-q1/4146816?tisearch=e2e-sitesearch&keymatch=LM5180%252520simplis#4146816, the only way to be sure of the stability of this PSR flyback is to used simplis simulation

So is it possible to get it ?

As test, I will do load transient response.

Do you know if there are other option to check by experiment the stability (using a Bode100 for instance) ? Or it's definitely impossible to check PSR flyback stability with standard VNA methods.

Thanks for your reply.

Best Regards

  • 0
    TI__Expert 5250 points

    Hi Lionel,

    Let me check if we have the Simplis model available and come back to you. 

    Regards,

    Hongjia

  • 0
    TI__Mastermind 18235 points

    Hi Lionel

    Sorry that we do not provide the simplis model . The PSPICE model is available for simulation on TI.COM.

    The bode plot test cannot be performed for the LM5180, we suggest doing the load transient instead as you said. 

    Thanks and best regards.

  • +1 in reply to Gui He
    Prodigy 60 points

    Hello
    Thanks for the reply.

    I also try to do a simulation with SIMetrix (classical spice simulation, trasnient style) but the model failed :

    There are errors in the circuit. Simulation aborted

    LM5180-Q1_TRANS.lib (60): ...

    *** ERROR *** Missing nodes and value

    LM5180-Q1_TRANS.lib (63): ...

    *** ERROR *** Missing nodes

    LM5180-Q1_TRANS.lib (66): ...

    *** ERROR *** Missing nodes and value

    LM5180-Q1_TRANS.lib (69): ...

    *** ERROR *** No model name specified

    As it's an encrypted model, it's impossible to debug it.

    Without a least a transient simulation working, we couldn't choose this part.

    Is it possible to get via email (and maybe under NDA) a non-encrypted model ?

  • 0 in reply to Lionel U
    TI__Mastermind 18235 points

    Hi Lionel

    Yes we can provide unencrypted pspice model under NDA. Please send email to Bella-he@ti.com and share the NDA number. 

    Thanks and best regards.