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800W～1.6kW solution of 80 Plus Titanium requirement

Satoshi
Guru 19595 points
Other Parts Discussed in Thread: UCC28950, UCC28070A

Customer is under reviewing below solution.

-----------------------------------------------------------------------------------------------------

・Bridgeless PFC + Phase shift Full-Bridge With Synchronous Rectification

・Input： AC 90～264V, Output： DC 12V

・1.6kW(200Vin) or 800W(100Vin)

・80plus Titanium requirement

・EMI：CISPR22 ClassA requirement

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Is there required 80plus Titanium solution?

Or is UCC28070A + UCC28950 require 80plus Titanium?

And, when in the case of output is 12V/133A, which below(① or ②) recommend?

①Secondary FET connect parallel(20 FET) 

②Current(load) share for UCC28950×???

Best regards,

Satoshi

  • 0
    TI__Mastermind 32500 points
    Hello Satoshi-san,

    I have notified the appropriate group of your questions, and you should see a response to your questions soon.
    Regards,
    Ulrich
  • 0 in reply to Ulrich Goerke
    TI__Expert 7050 points
    Hi Satoshi,

    I would say the efficiency mainly depends on the power stage design: the components you choose, the transformer and inductor design, the layout, etc. It is possible for UCC28070A + UCC28950 to meet the 80 plus Titanium, but it is very challenging. You may consider totem-pole PFC.

    As of the two options you mentioned, I don't see big difference in terms of efficiency. I would choose option 1 since it is much simple.

    Regards,
    Bosheng