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双电源供电,LM3886上电输出端有直流电压

Other Parts Discussed in Thread: LM3886

新做的板子,刚回来,上电,LM3886输出端有直流电压,刚上电有2V左右的电压,随着上电时间逐渐增加,能达到22V;

把输入端电阻断开R3,上电,输出端有直流电压22V;