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BQ24171: After OVP/ OCP protection

Yusuke Mukuno
Expert 7395 points
Part Number: BQ24171

Hi,

Could you please let me know the operation after OVP and OCP protection.

OVP (Datasheet)

9.3.17 Battery Overvoltage Protection
The converter will not allow the high-side FET to turn on until the battery voltage goes below 102% of the regulation voltage. This allows 1-cycle response to an overvoltage condition – such as occurs when the load is removed or the battery is disconnected. A total 6-mA current sink from SRP/SRN to AGND allows discharging the stored output inductor energy that is transferred to the output capacitors. If battery overvoltage condition lasts for more than 30 ms, charge is disabled.

Which will the device work Auto-retry or POR after charge disabled?

OCP (Vocp_min/Vocp_max spec from datasheet)

Vocp_min = 45mV
Vocp_max = 75mV

Which will the device work Auto-retry or POR after charge disabled?

Muk

  • 0
    TI__Guru 57541 points

    Muk,

    For battery OVP recovery, please refer to 9.3.21 Condition 1: The timer fault will clear when the battery voltage falls below the recharge threshold, and battery detection will begin. A POR or taking ISET below 40 mV will also clear the fault.

    For Charge Overcurrent Protection, please refer to 9.3.13: The charger monitors the charge current, and prevents the current from exceeding 160% of the programmed charge current. The high-side gate drive turns off when either overcurrent condition is detected, and automatically resumes when the current falls below the overcurrent threshold.

    The Vocp_min and Vocp_max specs provide the charge overcurrent limits under two different conditions on the top of the 160% of the programmed charge current threshold.

    Thanks,

    Ning.

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