Part Number:BQ76930Other Parts Discussed in Thread:BQ78350, BQ76200,
您好，In the external P-Channel FET balancing circuitry, the diodes are connected wrongly. The anode should connect to the gate of the FET and not after the gate resistor.Typically N-Channel FETs are used for external cell balancing as these are more robust for random cell connection. More details are explained in Section 10 Random Cell Connection – Within Limits of the bq769x0 Family Top 10 Design Considerations.I suggest they look at TIDA-01093 reference design for P-channel external balancing connections.TIDA-00792 reference design exhibits the BQ76200 high side driver and this design is the closest to the customer's design. Did they look at this design before? I suggest you first detailly look at these designs.