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BQ24610: BQ24610 no output voltage

Star Xu
Genius 9645 points
Part Number: BQ24610


Hi

The customer design the schematic but no output voltage.

Please help check the schematic and waveform.

4456.waveform.docx

Please give some suggestions.

Thanks

Star

  • 0
    TI__Mastermind 24075 points

    Hi Star,

       The waveforms only show VREF, REGN which are just DC values and PH. Instead, when there is no battery connected, can you take a waveform of VCC, PH and SRN?

  • 0 in reply to Kedar Manishankar
    TI__Genius 9645 points

    Hi

    Thanks for your reply.

    The customer grab some waveform, please help check it.

    波形.docx

    Thanks

    Star

  • 0 in reply to Star Xu
    TI__Mastermind 24075 points

    Hi Star,

       Looks like there is no switching happening at all. From the waveform, the VCC signal is DC at 5V, but on schematic the signal for input is labeled as 24V. With the charge regulation voltage of 16.8V, there would be no way to charge the battery with a 5V input, as this is a buck charger, so converter will be disabled as it will detect SLEEP mode. If converter is disabled, then HSFET will not turn on, so PH will be tied directly to battery (through RSR and inductor). As you are measuring 0.8V on both PH and SRN, then this makes sense.

    Please revisit your results, as there is an error somewhere.