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TPS63020负载电流1A,出现输入输出变成正弦波的现象

上面是原理图及Layout,芯片输出5V0.5A工作是正常的,但是输出5V1A就会出现输入输出都变成正弦波的情况。看了电感的饱和电流是3A,那电感应该是没有问题的吧。输入是从VIN_AC那里用稳压源接5V进去的,稳压源输出最大电流设置了5A。现在不知道为什么会出现正弦波,还请大家分析分析。