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bq24610 defeating precharge and DPM

Martin Risso
Intellectual 470 points
Other Parts Discussed in Thread: BQ24610

Hi,

I'm using the bq24610 in an application where I need to disable termination, precharge and DPM (adapter current regulation). Disabling termination is explained, tie the timer pin low.

With termination disabled, can I simply program Iset2 for approximately the same charge current as Iset1 effectively disabling precharge?

To disable DPM, can I simply connect ACP to ACN? What do I do with ACSET, ground it or float it?

BTW, I do need the power path control but I don't need adapter reverse protection (input will be hard wired). Do I still need both input FETS?

Thanks,

Marty

  • 0
    TI__Expert 8690 points
    Hi Martin,

    I encourage you to use our safety features to protect the charging system from getting damaged, but to answer your questions:

    Yes you can disable termination by tying TTC to GND and you can set ISET2 to the same as charge current.

    You can put ACSET to a setting where you will never hit it (max recommended voltage at ACP-ACN is 0.2V). You could short ACP and ACN which makes sense, but this is not tested and could result in problems.

    I recommend you use a reverse blocking FET to protect your input from sudden input loss or transients. A sudden change where your output voltage is higher than input will provide reverse current, potentially damaging your input. You may remove this FET if you wish though, but I don't recommend it.

    Thanks,
    Steven
  • 0 in reply to Steven Bangdiwala
    Intellectual 470 points
    Hi Steve,

    Thank you for the quick reply and answering my questions.

    BTW, I'm using the chip with a little external electronics and some firmware support for a lead acid charger. That's why I need to defeat these features that make good sense for a Li-ion charger.

    Marty