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LM25118输出问题

Other Parts Discussed in Thread: LM25118

       我利用LM25118芯片设计的是9~12V输入,12V@3A输出。空载的时候能够输出12V,可是当带20欧负载的时候,输出电压却变成了6V多。哪位大神能够帮忙解答一下啊。设计电路如下:

   

空载时引脚15的波形如下图:

空载时引脚19的波形如下图:

带20欧负载时,引脚15没有输出,引脚20波形如下图:

哪位高手给小弟指导一下迷津啊,不胜感激~~