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UCC28180: I need a suggestion on deciding a topology

Ajay P
Intellectual 310 points
Part Number: UCC28180
Other Parts Discussed in Thread: UCC28056

Tool/software:

hi,

Can anyone help me for designing and deciding a topology for 85VAC to 275VAC input, 24VDC, 200W output converter with PFC and without PFC?

Please help

Thanks and Regards,

Ajay

  • 0
    TI__Guru 50040 points

    Hi Ajay,

    It depends our your end equipment and requirements. In general, PFC is required for applications using 75W of power or more. However, based on the end equipment and usage there are exceptions. At 200W or below the UCC28056 is normally recommended. The benefit of using the PFC for universal VIN is that it can make the secondary DC/DC stage easier to design. 

    Here is an example design from WEBENCH based on the LLC topology. Note the efficiency estimate is very optimistic and the diodes should be replaced with a synchronous rectifier controller like the UCC24624. 

    I hope this answers your question.

  • 0 in reply to JCHK
    Intellectual 310 points

    Hi JCHK,

    I want to design a SMPS of output 24VDC, 200W (Output Power). So, can you suggest a high efficient low cost topology?

    Regarding the PFC option, I got clarification that as per IECEN61000-3-2, PFC is required for solution that required more than 75W power.

    Thanks and Regards,

    Ajay P 

  • 0 in reply to Ajay P
    TI__Guru 50040 points

    Hi Ajay,

    Sorry, the WEBENCH link did not show up in my above reply. I think a design Using the UCC28056 for the PFC, UCC256611 for the LLC, and UCC25624 for the synchrounous rectifier would be your best option. 

    What do you think?

  • 0 in reply to JCHK
    Intellectual 310 points

    Hi JCHK,

    Yes I think. But in WEBENCH, I won't be able to simulate right?

  • 0 in reply to Ajay P
    TI__Guru 50040 points

    Hi Ajay,

    Yes. WEBENCH does not have the power to simulate our AC/DC controllers. Can you use Simplis?

  • 0 in reply to JCHK
    Intellectual 310 points

    Hi JCHK,

    Is Simplis free online simulation software?

  • 0 in reply to Ajay P
    TI__Guru 50040 points

    Hi Ajay,

    Unfortunately, no. There is a free trial version but it is only limited to around 15 components. The reason we only have a Simplis model and not a Pspice model is that Simplis is much more stable and can more easily handle the LLC topology. A Pspice based model would take a very long time to run and likely run into convergence issues.

    We do have the online design calculator to help you get started. 

    Will this work for you?