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关于TPS54331噪音的问题

Other Parts Discussed in Thread: TPS54331, TPS65131

我是用TPS54331做了一个DC转DC的电路,输入9-16V,输出5V。调试时候发现当有液晶屏时(12V供电、500mA)电源无噪音,当把液晶屏取下以后,电流在200多mA时发现电源噪音很大,请TI的能否解答一下,或者有相同问题的人帮忙分析一下。