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LMZ23610: lmz23610 query

Star Xu
Genius 9645 points
Part Number: LMZ23610

Hi

 Please help check the attached file.3858.lmz23610 three models.docx

 Please give some suggestion for this problem.

Thanks

Star

  • 0
    TI__Intellectual 1690 points

    Hi, star

    May I ask what the value of the output capacitors is? It is a little bit hard to tell from the word file.

    Regards

    Yangbo

  • 0
    TI__Intellectual 1690 points
    Hi Star,

    One more thing I would like to check with you is that whether the syn clks (time1,2,3) are same or not.

    Regards
    Yangbo
  • 0 in reply to Yangbo
    Prodigy 10 points

    Could u see it clearly now?

  • 0 in reply to Synthia Xie
    TI__Intellectual 1690 points

    Hi Star,

    Thank you!

    First of all, I suggest to check the syn clk signal. Cause the modules must be synchronized by a clock signal to avoid beat frequencies in the output voltage caused by small differences in the internal 359-kHz clock. If the modules are not synchronized, the magnitude of the ripple voltage will depend on the phase relationship of the internal clocks.

    Secondly, from the schematic, I didn't see any bulky output capacitors. The datasheet states that a minimum value ranging from 330 μF for 6-VOUT to 660 μF for 1.2-VOUT applications is required based on the values of internal compensation in the error amplifier. And when you do paralleled output, the current sense gain of the entire system increases according to the number of modules slaved to the master. To compensate for this and ensure good stability, the total output capacitance has to be increased.

    Regards!

    Yangbo