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UCC25660: Variable output

Zhourong Wang
Prodigy 10 points
Part Number: UCC25660
Other Parts Discussed in Thread: UCC25600, UCC28951, UCC28950

Tool/software:

Hi,

I want to design a power supply using UCC25660, the main design requirement  is that the output voltage shall be varied acoording to control circuit，the Voutmin=120V, Voutmax=436V, maximum power at 436V is 500W, the input voltage is 400V fixed, may question is: Can UCC25600 fulfil this task? If not, what is the proper solution?

Thanks

Wang Zhourong

  • 0
    Prodigy 10 points

    Sorry, question is : Can UCC25660 filful this task ?

  • 0
    TI__Guru 50030 points

    Hi Zhourong,

    Supporting 500W from 120V to 436V, is not at all easy to do with the LLC topology,.This is a limitation of the resonant tank design and not the controller.

    A better approach for this power level and wide VOUT range could be the UCC28950. The Phase-shifted full-bridge can easily supply.

    Here is a WEBENCH design to get you started (note: the efficiency estimates are high becuase it is using ideal FETs).

    I hope this answers your question. 

  • 0 in reply to JCHK
    Prodigy 10 points

    Hi, JCHK, thanks for your  prompt reply.

    The 500W power is only at 436V, so the output current is about 1.15A, the load current is limited to this value, at 120V the power is about 140W.

    So can UCC25660 do this?

    By thw way where to down load the Excel calculator for UCC25660?

    As for UCC28950 phase-shifted full bridge controller, I have used UCC28951 to design a wide output power supply  from 2V to 24V, the maximum current is 80A, it is now under varification. The only reason I want to use UCC25660 for a 120V to 436V power supply is its power level and can be done with half bridge topology. So if it is hard to do with UCC25660, I will shift to UCC28951.

    Regards

    Wang

  • 0 in reply to Zhourong Wang
    TI__Guru 50030 points

    Hi Wang,

    It is not easy to setup the LLC tank to support 140W  at 120V and up to 500W at 436V. While at a much lower power level and voltage range PMP23454 does show how in a battery charging application the LLC can support pre-charge before entering into the full charge constant-current phase of the charging. 

    You can download the UCC25661 calculator here. Keep in mind this calculator is assumes the maximum power, not the minimum. 

    Regards,

    John

  • +1 in reply to JCHK
    Prodigy 10 points

    Hi JCHK,

    Thanks for your information, so I will move to UCC28951.

    Regards

    Wang