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。(Please visit the site to view this file)
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