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TPS45260Q1 电源纹波问题

Other Parts Discussed in Thread: TPS62140A, TPS62130A

TPS54260Q1做一个控制器的主电源12V转5V,负载大概0.05A,PCB为4层有专门的地和电源层,负载有MCU CAN 收发器还有其他一个通信芯片。电源纹波峰峰值30mv左右,开关频率频率700K+,但是纹波的频率为3K多,输入输出电容加大都没什么作用。电路图和测试数据都有。顺问一下便反馈的电源点距离输出滤波电容有点远会不会有哪些缺点,可不可以放在背面。专家们来帮忙分析下吧