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求助TPS5450纹波问题!

Other Parts Discussed in Thread: TPS5450

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