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PMP23454: Daisy Chain Of PMP23454

Jareth Tan
Prodigy 80 points
Part Number: PMP23454
Other Parts Discussed in Thread: PMP21999

Tool/software:

Dear TI experts,

I have the following requirements:

1. Input: 290V - 400V (DC)
2. Output: 200V, 20A
3. Requirement: CC, CV - whereby the CC is required because my load is a variable current sink, therefore my current reference will not be fixed. The CV is just to ensure OVP. 

Wondering if PMP23454 can be modified in the following way to fit my requirements 

Because of the LLC Topology, not sure if this daisy-chain is feasible.

The reason for this approach is because the development time given to my team is short - therefore it would be more practical to modify/combine tested and working designs to fit our requirements.

  • 0
    TI__Mastermind 27095 points

    Hi Jareth,

    It is possible to parallel LLCs but I believe it may be simpler to take something like PMP21999 and slightly modify the design a little bit to fit your input/output requirement. 

    https://www.ti.com/tool/PMP21999

    Best Regards,

    Ben Lough

  • 0 in reply to Benjamin Lough
    Prodigy 80 points

    Hi Benjamin,

    Thanks for the suggestion. However there are some other considerations that I did not mention which makes paralleling simpler in our case.

    So from what you mentioned, paralleling PMP23454 is possible. However, will there be any possible issues that you would foresee, or additional precautions that you would advise.

    Also, based on the specs for this reference design - it mentions that there is a trickle and full charge mode based on the voltage. May I ask if this voltage range is based on design, or is it a limitation of the LLC topology?

    Thanks!

    Regards,

    Jareth