UC3843，7脚输入12V电压被直接拉到9.3V UC3842，7脚有12V，8脚无基准，6无输出？
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\u7535\u538b.\u4e2a\u4eba\u56fe\u4e66\u9986[\u5f15\u7528\u65f6\u95f42018-1-21]
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交流输入电压应该是多少？是不是你的输入电压过低使得开关管导通程度过大导致的。你这是要给电池充电吧。
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