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LM5122: Parallel outputs

Tomas Lhotka
Prodigy 10 points
Part Number: LM5122

Hello TI team,

my question is about usage LM5122 with parallel output. But with different inputs. Is it real. This appliaction is about charging the gel battery from differnet inputs.

Thanks Tomas

  • 0
    TI__Guru 73960 points

    Hi Tomas,

    Thank you for considering TI solutions.  Is this for sharing or for redundancy?  Let me put it a different way:  do you want both the LM5122 circuits to operate at the same time to share the same load, or you just need one LM5122 to operate at a time with one live input, and the other can kick in when the first input is lost?   The solution will be different. Please clarify your requirement then we can follow up with a proper suggestion.

    Thanks,

    Youhao Xi, Applications Engineering

  • 0 in reply to Youhao Xi
    Prodigy 10 points

    Hello Xi,

    the system will work in sharing, but the sources will not be available all time.  :-) I think it will be combination of both.

    Thanks Tomas

  • 0 in reply to Tomas Lhotka
    TI__Intellectual 2775 points

    Hi Tomas,

    So it is include 2 conduction, one is work in sharing, but another conduction is just one phase work ?

    If it like as this you need 2PCS LM5122,  Operate independently. add current loop for each phase for current share.

  • 0 in reply to dehuan Qi
    Prodigy 10 points

    Hello Qi,

    sorry but I don't understand to your answer.

    in my case there is 8 or more independent sources and each of them requires one DC/DC converter. The sources are not available all time. But if they are available the request is to balance load.

    I like the PMP7969 design (High-Efficiency 4 Phase Synchronous Boost Conv for Automotive Trunk Amplifier App Reference Design) But maybe there is something better.

    Thanks Tomas

  • 0 in reply to Tomas Lhotka
    TI__Intellectual 2775 points

    hi Tomas,

    PMP7969 have the same input voltage, so it is parallel, But if you input not a same voltage, So you need to add additional  current sharing circuit. like the voltage droop current sharing. （The output voltage decreases linearly as the load increases .