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LMZ31707使用问题

Other Parts Discussed in Thread: LMZ31707

使用LMZ31707目前设计电路如下

       目前打件3颗其中一颗有动作,动作如下,其余2颗均无输出电压

 在于V14P0是12V输入时,输出会飘移抖动(0.9V~1.09V)

        在于V14P0是5V输入时,输出稳定(1.09V),但需將Rrt短路,使用參考設定1M電阻是無輸出

         请问这有哪问题导致?谢谢