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UC3907: circuit review,UC3907(LOAD SHARE CONTROLLER)

KIM Andy
Expert 2530 points
Part Number: UC3907

Hi,

I am requesting a circuit review for the UC3907.

I did not know how to configure the MLCC and applied it to 10nF.

The output value of the corresponding circuit is as follows.

Vout = 24V, Iout = 27A

Please tell me the wrong point in the circuit setting.

I want to know how to set R2, Rset, and Rsense.

Finally, I want to know what "master indicate" is.

Could you tell me how to set this up?

That is all. Thank you.

  • 0
    TI__Mastermind 25570 points
    Hello Andy

    I'd suggest that you have a look at the typical application shown in the document at www.ti.com/.../sluu166a.pdf . This will give you an understanding of what is involved.
    Please let me know what you mean by 'I did not know how to configure the MLCC and applied it to 10nF' and neither do I know what you mean by 'master indicate' and I'll try to explain.

    Regards
    Colin
    BTW: I'm travelling on business all next week so my replies here will be delayed.
  • 0 in reply to Colin Gillmor
    Expert 2530 points
    HI Colin

    When the output load current is 2.5A, when two SMPS are LOAD SHARE, each output current is measured as 1.35A, 1.15A. How can reduce the two output current deviations?
  • 0 in reply to KIM Andy
    TI__Mastermind 25570 points
    Hi Andy

    This level of current sharing at about 5% of full load is actually pretty good. Has the customer calculated what the typical imbalance should be ?
    Offsets in the IC amplifiers can cause this level of imbalance. One of the main reasons for current sharing is to even out the thermal load between the power modules - and this is most important at full load and less important at lighter loads.

    Regards
    Colin