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WEBENCH® Tools/UCC28070: Design calculations

Harijarani Kirlampalli
Intellectual 270 points
Part Number: UCC28070

Tool/software: WEBENCH® Design Tools

Hi,

With reference of ucc28070 design tool i have calculated the design parameters for my design. With the calculated values am not getting the regulated output as required for my design. please give me support to resolve this issue. Awaiting for your response.

Thanks

  • 0
    TI__Mastermind 31580 points
    Hi Harijarani

    Is this the same issue that you described in an existing thread, 590283 ? If it is the same issue then I will close this thread. Please provide your simulation results so our applications engineers can have the required information to help solve the problem.

    Regards

    Peter
  • 0
    TI__Mastermind 25570 points

    Hello Harijarani


    I have your files - the simulation needs some debugging and I'm working on it

    Regards

    Colin

  • 0 in reply to Colin Gillmor
    TI__Mastermind 25570 points
    Hello Harija

    This is a summary of the email I sent you directly

    I just noticed that you have the CS signal from the MOSFET driven by GDA connected to the CSB pin and that from the MOSFET driven by GDB connected to the CSA pin. I've swapped these over and the system seems to run ok -

    I'd suggest you do the following on your sim
    Swap over the CSA and CSB signals
    Add the 150pF to the DS of the switching MOSFETs
    Change the VSENSE and VINAC potential dividers to 1.536Meg / 9.27k - I think this will give you 500V out - please double check. You have three resistors in series for VSENSE and VINAC - that isn't a problem just remember that the TOTAL resistance of these three should be 1.536Meg.
    You should set LPFC to 70uH or so - I think it was set to 30mH in your original
    I'm not sure what the purpose of the sources V3 and V4 is - I deleted them from my sim.
    I suggest you double check the amplitude of your AC source (VAC) - run a separate sim on this part only and verify that the amplitude is correct - don't forget you could always just run the sim from DC just for debugging.

    Please let me know how you get on

    Regards
    Colin