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LM5022: Using the Average Switching Model for Flyback Power Supply Simulation

Travis Orvedahl
Prodigy 10 points
Part Number: LM5022


I am trying to make a flyback design using the Average Model of the LM5022, but I am unsure how to change/edit the design file example of the Boost converter into a flyback configuration.  Is this even possible using the Average Model, and if it is possible does anyone have an example that I can use for reference?

My first thoughts is to try and setup a coupled inductor to represent my secondary side of the xfmr with the corresponding inductance to represent the turns ration with the Average Model inductor.

Thanks

  • 0
    TI__Mastermind 31315 points

    Hi Travis,

    Thanks for utilizing the LM5022 in your design. I'm not sure of the existence of the LM5022 average model in a flyback configuration, but I can take a look into it when the holidays are over, and the engineer familiar with the model is back in the office. For now, I think you can use a transformer to represent the turns ratio, and have an inductor in parallel to represent the actual inductance.

    Thanks,

    Richard

  • 0
    TI__Mastermind 31315 points

    Hi Travis,

    I was able to contact the engineer familiar with the LM5022 average model. In this case, the LM5022 average model is set up for the boost converter, and is unable to be swapped into the flyback configuration. 

    I would recommend to just run a transient model of the flyback converter, and do a load transient and check the response, which should give you a good hint about its stability. You can also do the same with the actual circuit if it is built. 

    Thanks,

    Richard