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BQ40Z60: Buck Controller Control Architecture

Leo Rodriguez
Intellectual 945 points
Part Number: BQ40Z60
Other Parts Discussed in Thread: BQ24610

Hi Battery Management Team,

What control architecture does the BQ40z60 integrated buck employs? The datasheet suggest a fixed-frequency scheme, but I'm seeing frequency fold-back at light loads (during current taper).

Regards,

Leo

  • 0
    TI__Mastermind 42535 points

    Hi Leo,

    The controller is “voltage mode controlled”, there is no frequency adjustment to the controller oscillator with the operational mode.  There is the potential to skip ON pulses if the output current becomes sufficiently low, such as during current taper.

  • 0 in reply to Batt
    Intellectual 590 points

    Hi Batt,

    Thanks for the answer, which I also got help. I have an additional question.

    Which Synchronous Buck Controller is the most similar to which built in the bq40z60? Of course, among the TI product family.

    The reason why I ask this is that I have struggled with the EMI of my bq40z60 board, where the buck part dominates the emission. So I am building a similar Buck controller board to diagnose the EMI.

    Regards,

    J.H.Kim

  • 0 in reply to Joshua Kim
    TI__Mastermind 42535 points

    It's the bq24610.