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R3 R9空贴，输入电压9V，电池7.6V，不接电池时SRN无输出，state脚波形为方波
原因找到了，是因为没接温度脚，按照参考设计时必须接一个NTC电阻，或者自己计算一个值并联，不然会处在过冷模式
