你的电路接错了。你那样接，MOS管处于放大状态而不是开关状态。正确解法如下：按下按键，MOS管截止，断开按键导通。
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(ON), low gate charge and operation with gate voltages as low as 2.5V. This device is suitable for use as a load switch or in PWM applications. Standard product AO3401 is Pb-free (meets ROHS & Sony 259 specifications). AO3401用途先进的沟槽技术toprovide优秀RDS(),低门充电和操作以门电压一...