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UCC256301: Can UCC256301 used as LLC controller when input is 400VDC to 850V DC

Betty Guo
Expert 7300 points
Part Number: UCC256301
Other Parts Discussed in Thread: UCC256303, UCC25600

Hi,

do we have product can be used in iso-dc/dc applicaiton? the spec s below:

input :400V to 850V DC

output: 24V/500W

I found the reference design use UCC256301 as LLC controller for 500W AC/DC, but the max HV voltage of UCC256301 is 650V, so do you have some recommendation for high voltage application?

thanks.

  • 0
    TI__Expert 6080 points
    Hello Betty,

    You may use UCC256301 for high input voltage as long as there is a voiltage clamp at the HV pin because of the 650V abs max rating of the controller.
    Attached below is the list of all the reference desings at the 500W power range.
    www.ti.com/.../index.html
    May I ask the EE and application of this design? if they want a PFC stage to provide this DC input?

    Regards,
    Sonal
  • 0 in reply to Sonal Singh
    TI__Expert 7300 points

    Hi Sonal,

    you mean, add the voltage clamp on HV pin when input is the range of 400V to 850V?

    the reference design are that AC input, not for high voltage input, I have some concern when input is 850VDC. Can you provide a simple schematic for 850VDC input?

    It used in E-BUS, and is supply by power battery. battery may signal or mutl-series, so they needn't PFC stage.

    thanks.

  • 0 in reply to Betty Guo
    TI__Expert 6080 points

    Hello Betty,

    Unfortunately, I was unable to find a schematic example for you of UCC256301 for 850V DC. But may I suggest two possible solutions:

    1. UCC256303: HV startup is disabled so you would not have to worry about it. The high voltage path components will have to be changed to ones with higher voltage rating.

    2. UCC25600:  can be a possible solution at 850V input attached is a design for your reference.

    Regards,

    Sonal

  • 0 in reply to Sonal Singh
    TI__Expert 6080 points
    Hi Betty,

    Since you have not replied, I am assuming that your query was resolved.
    If not, just post a reply below (or create a new thread if the thread has locked due to time-out)

    Regards,
    Sonal