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UC3845: Boot converter with paralleling

mudit mittal
Prodigy 80 points
Part Number: UC3845
Other Parts Discussed in Thread: UC3907, , UCC29002

Hi,

we are designing a boost converter with 3kw output  ,for modularity I break down the power requirement of 1500W each . in order to provide 3000w i am just paralleling the converter. for parallel operation i am planning to use LM5080  or UC3907.

can you recommend any other ic or how to effectively used these ic for parallels operation.

my input is 40V and boost out put is 48V , for boost converter i am using UC3845 

Regards

Mudit

  • 0
    TI__Guru 50170 points

    Hi Mudit,

    If you are looking for a sharing controller we have our UCC29002. 

    At this power level, normally we recommend a phase-shifted full bridge. Here is a reference design that seems to be close to what you are looking for: PMP6712. This is using our UCC28950 as the primary controller. 

    I hope this answers your question.

  • 0 in reply to JCHK
    Prodigy 80 points

    Hi

    The system is non isolated  ,so as par my understanding phase shifted full bridge will not work .

    any recommendation / critical point  to be taken care  while designing parallel systems

    Also UCC29002 use high side sensing for current share. as par the datasheet CS+ and CS- the voltage will not be higher than 15V

    since my output voltage will be 48V ,shall i have to use low side current sensing .pls provide

  • 0 in reply to mudit mittal
    TI__Guru 50170 points

    HI Mudit,

    Figure 5 on page 11 of the UCC29002 datasheet shows an example of using the load-share controller in higher voltage systems.

    Do you think this can work for you?

  • 0 in reply to JCHK
    Prodigy 80 points

    Dear All

    can you provide some suggestion how to implement programmable current limit and shutdown mode in uc3845

    Regards

    Mudit

  • 0 in reply to mudit mittal
    TI__Guru 50170 points

    Hi Mudit,

    I am not sure how you want to control the current limit, but here is an example to create two thresholds. To disable the controller the VCC pin needs to be pulled below the UVLO.

    I hope this answers your question.