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UCC256302: 200W Bidirectional isolated DCDC

Hiroshi Doi35
Expert 2845 points
Part Number: UCC256302
Other Parts Discussed in Thread: UCC256303, LM5122

Hi Ben-san,

My custoer want to make Analog 200W Bidirectional isolated DCDC.

DC50V to DC300V  <===> DC400V     Efficiency TGT is 97% <-- may be difficult

Reverse mode is DC300V fix. voltage <== DC400V     And  300V is Tracking CC control by secondary control voltage.

Forward mode, DC50V to DC150V renge is no concern about Efficiency.

Does UCC256302 meet this spec?

If only UCC256303 meet this spec, I will request aux. power to the customer.

  • 0
    TI__Mastermind 27115 points
    Hi Doi-san,

    Do you have a block diagram of your customer's proposal? UCC25630x can only control a uni-directional converter. You would need to shut down UCC25630x and use a separate controller to convert power the other way. Typically bidirectional converter are implemented with digital control. Based on the information you provided, I do not think UCC25630x can meet your customer's spec at this time.

    Best Regards,
    Ben Lough
  • 0 in reply to Benjamin Lough
    Expert 2845 points

    Ben-san,

    There are well known LLC analog reverse way in Japan by Junichi-san.

    I only ask you, forward direction DCDC.

    From DC50V-300V to DC400V  200W

  • 0 in reply to Hiroshi Doi35
    TI__Mastermind 27115 points
    Hi Doi-san,

    The 50V to 300V input range is quite large for LLC. This will make the power stage design challenging, especially if the efficiency target is 97%. The limitation will not come from the UCC25630x controller however, only the LLC power stage design.

    Best Regards,
    Ben Lough
  • 0 in reply to Benjamin Lough
    Expert 2845 points
    Hi Ben-san,
    DC90V-DC300V input —- UCC256303 only. 97% Efficiency required DC150V - DC300V.
    DC50V-DC90V input —- LM5122 boost add before UCC256303. No need efficiency requirement.
    Secondery is around DC400V. I think it is good for efficiency.