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BQ76920: After the protected MOS tube is over-temperature protected, the charging and discharging MOS tube is turned off, and a multimeter is connected in it. There is a current of about 12MA, and then it slowly decreases. The direction of the current is a

user4455147
Prodigy 110 points
Part Number: BQ76920

After the protected MOS tube is over-temperature protected, the charging and discharging MOS tube is turned off, and a multimeter is connected in it. There is a current of about 12MA, and then it slowly decreases. The direction of the current is as shown by the arrow in the figure. Why is there still this current after the charging and discharging MOS is turned off?

保护的MOS管过温保护后，充放电的MOS管关闭，串一个万用表进去，有12MA左右的电流，然后慢慢降低。电流方向如图箭头所示，请问充放电的MOS关闭后为啥还有这个电流?

  • 0
    TI__Guru*** 130456 points

    您好，正在询问更了解这款芯片的TI工程师，稍后回复。

  • 0
    Prodigy 110 points

    Part Number: BQ76920

    BQ76920设计的BMS保护板，在老化的时候MOS管发热过于严重，MOS的数量是够的，电路图中哪些参数可以优化MOS发热严重的问题？

    For the BMS protection board designed by BQ76920, the MOS tube heats up too much when it ages. The number of MOS is sufficient. Which parameters in the circuit diagram can optimize the MOS heat problem?

  • 0 回复 user4455147
    TI__Guru*** 130456 points

    您好，正在询问更了解这款芯片的TI工程师，稍后回复。

  • 0 回复 Star Xu
    TI__Guru*** 130456 points

    您好，请参考下面内容：

    Why is the customer not using our integrated low-side drivers? What is the voltage for the gate-source of the CHG and DSG FETs? Maybe the FETs are not fully OFF initially. 

    What currents are they expecting? Do the FETs heat up during turn-on/off or during normal operation? If it is during turn-on/off, then adjusting the turn-on/off speed may help, however, if it is due to normal operation, then more FETs may be required.