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LMR33640 PSPICE simulation incorrect

Julia Rozycka
Prodigy 700 points

Hi, 

I have the question regarding PSpice simulation of 24V to 15V power supply design. Based on the project on WEBENCH: 

I created the project in Pspice:

but with the simulation I am not able to achieve 15V output voltage. Can you recommend changes in the design or tips on how to manage simulation?

Cheers

  • 0
    TI__Mastermind 22299 points

    Hi Julia,

    Why did you choose this device? it looks like you only need 1.5A.

    Did you run the PSPICE simulation with the default BOM?

    I ran the default BOM steady state simulation fine. Then changed the FB resistors and inductor to get 15V output simulation working fine.

    On your Sim it looks like VIN is not coming up. Does the VIN voltage rise?

    Also I'm not sure if it matters, but I dont think you should have units for the inductor and capacitor. Use 22u instead of 22uH.

    -Orlando