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LM5117 输出电压不可调

Other Parts Discussed in Thread: LM5117

48V输入,设计输出可调电压范围28V-40V之间,做好发现上电空载的时候输出是8V,一会掉到4.5V,调节可调电阻,电压不可调,一直输出是4.5V。另一路同样是用LM5117,但是设计的是48V输出,3.3V-10V可调,这一路就很正常。不知道是什么原因,求教!附件有电路图。