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BQ24725: BQ24725 can not charge

Star Xu
Genius 9645 points
Part Number: BQ24725

Hi

My customer use BQ24725 can not charge.

attached schematic and waveform

measure  result as below:

ILIM 3.3V

ACOK 3.3V

D(3pin) of Q4 is 12.5V, ACFET，RBFET is turn on.

input voltage is 16V

Waitting for your reply

Thanks

Star

  • 0
    TI__Genius 11850 points
    Hi Star,

    A few comments on your schematic:

    1) Use 1 MΩ instead of 3 MΩ for R2.
    2) Use 100 pF instead of 100 nF for C139.
    3) Add a 10 Ω resistor and a 1 µF capacitor to VCC to form a low-pass filter, as shown in the typical application diagram given in the datasheet.
    4) Is the ILIM pin voltage actually 3.3 V? Based on your resistor divider values, ILIM should be 0.75 V.

    Also, what signal is shown in the waveform?

    Best regards,
    Angelo
  • 0 in reply to Angelo Zhang87
    Expert 2340 points
    Hi,
    This issue has been solved. The reason is that the sample resistor is too big. Thank you for your great support!
    Thanks.
    Kevin Xiong