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BQ76930: BQ78350+BQ76930 help check the schematic.

Star Xu
Genius 9645 points
Part Number: BQ76930
Other Parts Discussed in Thread: BQ78350, BQ76200,

Hi

Please help check the schematic, BQ76930+BQ78350 design with 7 series (MOS high-side control, using BQ76200 driver)

The cell voltage cannot be collected, and cannot communicate; PEGOUT output voltage is 0.6V.

8816.Schematic Prints.pdf

Please give some suggestions.

Waiting for your reply.

Thanks

Star

  • +1
    TI__Mastermind 27321 points

    Hello Star,

    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 they first detailly look at these designs.

    Regards,
    Jose Couso