回复 Star Xu:
1. Q56 provides a switch with Q16 of the current to the diode string. It looks like the voltage limit is 33V with the zener and gate voltage limit of Q56. Q56 was a later addition from its number, it must have had some significance to the circuit. With a quiescent system it would seem a single FET should handle the Vgs for the VC5X derived voltage at Q14 source. You might simulate to determine if it is needed in your application.
2. Q14 provides a limited voltage to the circuit with current from the full cell stack. Removing it with connection to BAT+ would overvoltage the circuit. Connecting to VC5X_B would pull unexpected current from the node and shift the operating voltage of the part.
3. Four diodes will provide a more definite voltage than a low voltage zener as well as block reverse voltage (which would not seem to be an issue here).
您可以用 http://www.ti.com/tool/TINA-TI 模拟一下您的设计电路。