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UCC28070 Four-Phase Application IMO pin processing?

Data sheet Fig18 of UCC28070  that  it connect an IMO pin  directly  and do not malfunction?

Is not resistance necessary to separate when IMO pin connect?

 


Regard.

Bob Lee

4 Replies

  • Bob,

    This is a case where the two UCC28070s are connected in parallel. The use of a single RIMO resistor to ground  provides a common reference for all four phases of the circuit. since they are current sources the currents from the two UCC28070 will automatically add aand don't need any resistors between them.

    John

    John Bottrill

  • In reply to John Bottrill:

    Dear John Bottrill


    Thank you very much for your answer.
    May I ask one more question?

    I use UCC28070 and operate it in Four-Phase period, but switching becomes unstable.

    Would you show me a figure of controller part PCB Layout if you are possible?

    Is there Four-Phase period such as PCB Layout of slur037.pdf?

    I hope your kind answer.

     

    Regard.

    Bob Lee

  • In reply to Bob Lee62837:

    Sorry Bob,

    I don't have anything like that.

    Regards,

    John

    John Bottrill

  • In reply to John Bottrill:

    Dear John Bottrill

    Thank you very much for thinking of answer.

     

    Regard.

    Bob Lee

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