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TPS7A54: layout时地环路对其影响

Part Number: TPS7A54

我在使用TPS7A54,PCB板单测空板电源还正常,但将TPS7A54接上1A的负载,就会发现电源输出异常,后来就一点点在电路板上试,发现把TPS7A54的地路径短一点就好了(将图片中标记的两块铜皮连接),但我不知道原因,特向大家请教