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您好、Yuan、
降压模式:
Q3是主 FET、Q4是续流 FET。 PWM 占空比(Q3导通时间)随着输出电流的增加而增加。
升压模式:
Q4是主 FET、Q3是续流 FET。 PWM 占空比(Q4导通时间)随着输出电流的增加而增加。