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LM5145反馈引脚FB输出不正常，正常的FB输出电压是0.8V，现在突然会上升到1.2V，然后就一直往下降,求各位指点一二
空载，原理图是仿照这个设计的
你好，
FB电压上去了，说明输出电压上去了，可以测一下输出电压波形看看，谢谢。
应该是环路问题，你可以用WEBENCH软件优化一下电路， FB上去在下来是因为空载条件下，环路效应不够快，只能让FB慢慢下来
