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TPS56528纹波问题?

Other Parts Discussed in Thread: TPS56528

我参加2014高校TI杯,测试TI推荐的芯片TPS56528,电路按照EVM来画的,

5V输入,0.6V输出不带负载,波形如下:

若带上51欧的负载,波形如下:

5V输入,调整到4.2V输出带上51欧的负载,波形如下:

我想知道哪里出了问题?这波形是怎么回事?