This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

  • Resolved

BQ24610RGET -Impact of connecting battery with wrong polarity

Hi,

We have used BQ24610RGET battery charger IC in our module,we noticed that the LED connected to PG pin of the IC is  Blinking on providing Adapter I/P supply, even though Adapter supply seems to be good and we confirmed the same using a second board, where we found it functioning as expected.

This was not observed initially,  we are suspecting battery was connected with wrong polarity during testing ,which is causing this faulty behavior.

We too noticed no battery charge voltage is generated by IC at battery connection point.

Whether connecting battery with wrong polarity will  cause failure of IC or something else is causing the issue.

Regards,

Harish.S

  • Plugging in the Battery with wrong polarity can damage the IC. Please replace the IC and check if all the FETs are good and test again.

  • In reply to Jing Zou:

    Hi,

    Thanks for the reply, we probed the ACDRV pin connected to gate of input side P Mosfets  and found it constantly switching its state at interval of around 50mS ,before replacing the IC we would like to confirm anything else will cause this observation ,since the criteria for Turn ON/OFF of  input side P Mosfets is comparison of voltage at SRN and VCC Pins,  which seems to be fine in our case.

    Attached waveform for your reference.

    Regards,

    Harish.S

  • In reply to Harish S:

    ACDRV output is based on if VCC is greater than SRN+100mV, VUVLO, or if ACN is greater than SRN+200mV. So you might want to check what causes ACDRV oscillate by probing VCC, SRN, ACN pin check which of the condition above fails.

  • In reply to Jing Zou:

    Hi,

    We have seen waveforms at VCC ,SRN and ACN pins and found VCC pin is dipping below SRN voltage at regular interval(ACN  wrt SRN  is normal ),we are not sure on the reason behind this dip in the VCC voltage, any clue could help us to make proper decision for replacement of IC if damaged.

    We can't make sure that the  IC is damaged , since most of its features seems to work and doubt that the problem will persist with new IC also.

    We have verified other discrete components connected to the circuits and everything is fine.

    Attached the observed waveform .

    Yellow:VCC    Green :Battery Voltage

    VCC dipping at the interval of around every 1.5Sec

  • In reply to Harish S:

    You can try add more capacitor at the input to see if it can hold up the VCC.

  • In reply to Jing Zou:

    Since we did not hear back from you, we assume the issue has been solved. Thanks.
  • In reply to ezhao:

    Hi

    The issue was resolved after replacing the IC and 10 Ohm(0.25W) failed series resistor connected to IC VCC supply.

    We are suspecting cause of Series resistor failure due to additional bulk capacitor (10Uf) that we connected across VCC supply during debugging, due to inrush current through resistor. Let us know about any other mode of failure.

    Anyway thank you for the continued support.

    Regards,
    Harish.S

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.