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UCC28056: UCC28056

Rene Schilling Johnson
Prodigy 70 points
Part Number: UCC28056

Dear TI-Team,

is there an LT-Spice model of UCC28056 available  and if so could you please send it to my Mail Adress or answer with a link ?

Thank you very much.

Sincerely

René

  • 0
    TI__Expert 8210 points
    Rene

    We do not have a SPICE model of UCC28056. There is a SIMPLIS model for UCC28056 though, which is available at the following direct link

    www.ti.com/.../slum620

    For complicated switch mode power supply controllers like UCC28056 it is becoming increasingly difficult to use SPICE to model them effectively. SIMPLIS is a simulation tool for switched mode power supplies so it overcomes these limitations.

    Best Regards,
    Eric
  • 0 in reply to Eric Faraci
    Prodigy 70 points

    Hello Eric,

    thank you for your quick reply. I will look into the SIMPLIS Model and try to create my System with it.

    Would you have a suggestion of how to design my inductor if I want to use UCC28056 as a DC/DC - converter (Boost only, without PFC) ?

    My current problem is that I am not entirely sure how the CrM/DCM Control Principle of UCC28056 works. I need to find an ideal frequency, so that I can determine the correct boost inductor needed to boost my minimum Voltage (210 VDC) to my 390 VDC output. The problem that I have is that UCC28056 can change both the frequency and also the ON-Time to regulate my output to 200 W at 390 VDC. I believe that UCC28056 only uses frequency modulation for PFC purpose and  the ON-time will change to regulate output-power and voltage regulation purposes.

    Could you tell me weather I am correct with my assumptions ? Also, would you have a suggestion for my switching frequency of UCC28056 so that I can design and determine the inductor needed for my application ?

    Thank you very much.

    Sincerely,

    René

  • 0 in reply to Rene Schilling Johnson
    TI__Expert 8210 points
    Rene

    Our product expert for UCC28056 will reply with more details on its operation.

    Best Regards,
    Eric
  • 0 in reply to Eric Faraci
    TI__Prodigy 750 points
    I believed I have answered this question in e2e.ti.com/.../753177 Let me know if you have any follow on questions
  • 0 in reply to VA Viswanathan
    Prodigy 70 points
    Hi Eric,

    Yes, you are right. I am sorry for not better checking the forum for that question. Thank you very much for your reply in these early days of 2019.

    Greetings,
    René