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LM5145: 板内DCDC干扰

Part Number: LM5145

下面是我画的一块电路板,顶层和地层示意图;当DCDC带载10V/20A时,会在弱信号一侧出现一个和DCDC开关频率的同频干扰信号,请问有什么整改方案,能让这个干扰信号消失。