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Simulation with Buck Controller LMR33620ARNX_TRANS does not work

ANS

Hi,

I cannot get my circuit in PSpice working. I am trying to simulate the recommended circuit from Webench but the controller does not switch at all. Does anyone have an idea of what I am doing wrong ? See attachementBuck_16_Sim.zip

Thank you in advance !

  • 0

    I couldn't get to Buck_16_Sim.zip.  Anyway, I ran all three examples of the Webench simulations. Before you run one, you have to set its schematic to root and its corresponding simulation profile to active.
    1) In the Project Manager's Design folder right click the schematic you wish to run and select "Make Root".
    2) In the Project Manager's Simulation Profiles folder right click the corresponding profile and select "Make Active".

  • 0 in reply to retiredEE

    Thank you for your response. "Make Root" as well as "Make Active" are gray such as I cannot click on it. Does that mean the files are already set as "Root" respective "Make" ?
    Here some screen shots. It can be seen the simulation ran, but the controller does not switch as I expected and the output stays low.

  • 0 in reply to ANS

    When you mentioned Webench I assumed you were trying to run the examples provided in the LMR33620ARNX_TRANS package that you can download from TI.  That package contains three circuits and three sim profiles.  What you've shown here is a single circuit you created so "Make Root" and "Make Active" don't apply at all.  It appears that your circuit does run without any errors reported.  Try running it for 5ms with MODE and FASTSS set to 1.

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