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UCC28700: 3kV output converter, quasi resonant controller = LM5185 or UCC28700

Bernat F.
Prodigy 40 points
Part Number: UCC28700
Other Parts Discussed in Thread: LM5185, , LM5023, UCC28600

Tool/software:

Hi,
We are trying to develop a 3kW converter quasi resonant with input 12Vdc and output 3kV dc. 
The power of this converter should be 3.5W and will work in discontinuous mode.
Our first option as controller of the flyback was a LM5185
But that became a problem because due to design specifications we need to work in discontinuous mode and with a high reflexed voltage.
And LM5185 can just work in quasi resonant mode in continuous mode (which will happen in rare situations)
So we chose as an alternative UCC28700, which is able to work in quasi resonant in any mode. But with the counterpart that it requires an initial minimum voltage of 28V,
So our actual solution includes a converter that generates this initial voltage. 
Our doubt is, is this the best possible solution?
Would anyone recommend another controller for this challenge?
Thanks for your help
  • 0
    TI__Mastermind 24375 points

    Hi Bernat,

    Thank you for reaching out.

    I tried checking for other products in the offline AC/DC portfolio (like LM5023 and UCC28600) but 12V as you said might not be sufficient for UVLO turn on levels. I think if you are able to generate the initial voltage and then able to maintain the operating voltage above UVLO turn off levels, then it should be ok to use any PSR like UCC28700/10/30 or SSR controller like the above ones.

    Regards,

    Harish