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DCR011205U隔离电源芯片噪声太大?



电路和PCB布线如图所示:

整个电路用电量很小,估计10mA。在完整PCB上测量发现噪声很大。单独焊接了面包板,排除其它电路干扰,12V供电也由外部安捷伦电源供电,噪声还是很大。

噪声测量图如下(20M带宽):

输出5V管脚噪声很大,12V输入管脚噪声也很大,都把安捷伦电源污染了。

 

请问是我什么地方设计的不对吗,这开关噪声也太大了!!!手册写着20mVPP!!