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40210带不起负载是怎么回事?



今天照着datasheet上的电路画了一块pcb,元件焊接后刚开始还可以,后来就不行了,测试了开关管栅极电压,没有电压,所以我觉得可能是40210没有工作吧

电路图是datasheet上的,如下图: