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BQ24725A: High side MOS Vgs rises abnormally

Gary Jiang
Intellectual 980 points
Part Number: BQ24725A

Hi team,

My customer now uses BQ24725A and find that when Vgs ramp up, the waveform is not one-way up. Please see the following waveform. The purple one is the Vgs,and the yellow is the voltage of BSTS pin and PHASE pin. And the boot cap value they use is 47nF. Can you help me with this issue? Thanks!

  • 0
    TI__Genius 11850 points

    Hi,

    Thanks for the question. I'd like to gather some more information to help investigate this further:

    • Can you please share the schematic?
    • What is the adapter voltage, and what are the load conditions (battery voltage, battery current, and is there a system load connected)?
    • Can you please capture two waveforms showing BTST, PHASE, HIDRV, and LODRV? It would be helpful to see a slightly zoomed out waveform showing several switching cycles, as well as a zoomed in waveform which clearly shows the glitch (similar to the waveform you sent).
    • Despite the glitch in the rising edge, it looks like the converter is still switching successfully. Is the charger working as expected aside from this glitch?

    Best regards,

    Angelo