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TPS22860负载开关关断时间问题?

Other Parts Discussed in Thread: TPS22860

使用TPS22860关断3.3V电压,发现电压降到400mV左右需要1.2s,3.3V后面就接了3个RS232和RS422的芯片,每个芯片去耦电容0.1uF。跟手册给的掉电时间差好多?求解?