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BQ24610: About BQ24610 battery detection mechanism

Zilin Yang
Prodigy 30 points
Part Number: BQ24610

Tool/software:

1.Part number:BQ24610

2.Software/Tools/models used: buck converter

3.Is the problem related to the schematic or layout?

If yes, please provide the schematic/layout:

4.Question:  The input voltage is 19 V, the output voltage is 14.3 V, and the output voltage will periodically drop to about 9.8 V under no-load. The HS tube has no driving waveform periodically. Is this due to the battery detection mechanism of BQ24610 ? After adding a constant current load source at the output end, the phenomenon still exists. Is this due to the fact that the constant current load source cannot simulate the battery ? Whether it is detected as the battery does not exist, the output voltage periodically falls under the VLOWV.

output voltage waveform：

     

BUCK high-side tube waveform：

      

  • 0
    TI__Mastermind 20570 points

    Hi Zilin, 

    Thanks for posting. It was a US holiday on Monday. A team member will look into this and get back to you tomorrow.

  • 0 in reply to Jing Zou
    TI__Mastermind 31551 points

    Hello Zilin,

    Zilin Yang said:
    4.Question:  The input voltage is 19 V, the output voltage is 14.3 V, and the output voltage will periodically drop to about 9.8 V under no-load. The HS tube has no driving waveform periodically. Is this due to the battery detection mechanism of BQ24610 ? After adding a constant current load source at the output end, the phenomenon still exists. Is this due to the fact that the constant current load source cannot simulate the battery ? Whether it is detected as the battery does not exist, the output voltage periodically falls under the VLOWV.

    Yes, This related to the battery detection scheme. I see no issue with the waveform. You will need to use a constant voltage source or bi-directional power supply to mimic a battery.

    Best regards,

    Christian.

  • 0 in reply to Jing Zou
    Prodigy 30 points

    Hi Jing Zou,

    Thank you for your reply. Wish you a pleasant holiday.

  • 0 in reply to Christian Moyer
    Prodigy 30 points

    Hello Christian,

    Christian Moyer said:
    Yes, This related to the battery detection scheme. I see no issue with the waveform. You will need to use a constant voltage source or bi-directional power supply to mimic a battery.

    Thank you for your prompt reply and valuable advice. I will follow your suggestion to conduct the test using a constant voltage source or a bi-directional power supply to mimic the battery. Should any questions arise during the testing process, I may reach out to you for further guidance.

    Best regards,

    Zilin