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BQ24232: bq24232 / Large pulse charge current during supplement mode to charging

Part Number: BQ24232

Hi,

My customer found that the large pulse charge current is occurred when the operation is changed from supplement mode to charging. This may not be issue for battery because the duration of this pulse current is very short, but this may be issue when the system load will be change periodically and high frequency. Actually they tested with continuous pulse load as attached and then they could see over charge protection at by protection at battery. I believe that this pulse current is occurred at Deglitch time between supplement mode to charging, so I'd like to know how to reduce the peak of this pulse current to the battery.

I took this waveform by using EVM. I just changed ILIM to 200mA and ISET to 30mA. And then connect pulse load by electrical load from Vout.

Best Regards,

Satoshi / Japan Disty

  • Hello Satoshi,

    Other than the ILIM and ISET, are all the other values on the EVM the same?

    Regards,
    David
  • In reply to David Cuevas:

    Hi David,

    Thank you for your comment. Yes, all the other values are default. Can you please check this behavior on your bench?

    Best Regards,

    Satoshi

  • Satoshi,

    Yes. I'll have results by the end of the day.

    Regards,
    David
  • Hello Satoshi,

    I ran into some problems with my EVM. I'll provide an answer as soon as I can.

    Regards,
    David
  • In reply to David Cuevas:

    Hi David,

    Thank you for your support. I'm waiting for your update.

    Best Regards,
    Satoshi
  • Hello Sitoshi,

    Thank you for your patience. I've had to order new EVM boards because the one I had was modified for another customer.

    I believe the problem is caused due to the fast switching speeds, or needing more caps on the output.

    Regards,

    David

  • In reply to David Cuevas:

    Hi David,

    Thank you for your support. I tried to evaluate by adding output capacitor to slow the ramp rate when the operation is changed from supplement mode to fast charge. Then I could see the peak of pulse current to the battery is reduced when 200uF of aluminum electrolytic was added.

    Best Regards,

    Satoshi / Japan Disty

  • Hello Satoshi,

    That is great news.

    Regards,
    David

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