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LMR14206

Other Parts Discussed in Thread: LMR14206

 使用LMR14206做一个36V输入,3.3V输出。发现LMR14206芯片出现概率性烧后端芯片现象,初步分析为该DC-DC芯所致。DC-DC转换原理图:请帮忙分析下原因,谢谢!

原理图:

示波器测得有烧芯片时3.3V输出波形:输出过冲电压高达12.4V。

烧芯片时PWM输出波形: