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BQ25731EVM: Q6,Q7,Q9 function

Part Number: BQ25731EVM

Tool/software:

Dear TI expert,

what's the function, the following block

When VBUS falls below 3.2 V or rises above 26.8 V, CHRG_OK is LOW. When one of SYSOVP, SYSUVP, ACOC, TSHUT, BATOVP, BATOC or force converter off faults occurs, CHRG_OK is asserted LOW.

when CHG_Ok is LOW, the Q10 close, Q9A and Q9B close.What is the main function used for?