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TP79333供电问题~!

8V电池,采用二级稳压,一级用TPS7350,二级用TP79333。打开电源开关,TPS7350能瞬间稳到5V,但是TP79333却不能瞬间稳压到3.3V,用电压表测会发现电压一点一点攀升。无负载。为什么?