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LM5018问题

Other Parts Discussed in Thread: LM5018

按照官网提供的电路图设计LM5018开关电源,电路参数如下:输入12V~60V ,输出电压5V,输出电流80mA

出现问题如下:1.输入电压超过13V,就不能正常工作,此时输入电流高达几百mA;

                         2.Vout等于5V,按照官网RF2:RFB1=3:1。实际上,Vout随着输入电压的增加,Vout也是逐渐增大的。

请问,出现上述问题的原因是什么?