画了个TPS5450 5V 5A的dcdc电源，结果电源纹波太大了，有300mv左右！
附上原理图及PCB，求教怎么改进PCB？
下面是板子焊接实物图
C6那个电解电容替换成了datasheet里面推荐的电容10TPB330M，
板子的背面是一整块敷铜铺地！
最有一张是电源纹波图
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