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WEBENCH® Tools/LM5122: PSPice for TI simuation shows strange behaior

Bertram Brummer
Intellectual 1556 points
Part Number: LM5122

Tool/software: WEBENCH® Design Tools

I tried to simulate an inverting buck boost converter. Unfortunately the LM5122 doesn’t start to switch and nearly all external pins rise to voltages that are far too high. 

How can I find the root cause?

Controller.zip

  • 0
    TI__Mastermind 21720 points

    Hi Bertram,

    Thanks for reaching out with your question and for considering the LM5122 in your design.

    Can you please let me know what the specifications are for the application? 

    Typically if the input voltage needs to go from positive to negative a buck controller can be used. If the input voltage needs to go from negative to positive a boost controller can be used.

    Feel free to reach out to me directly as well.

    Thanks,

    Garrett