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TPS54360烧毁VIN引脚

Other Parts Discussed in Thread: TPS54360

各位前辈好,最近发现我的一款板子上TPS54360的2脚总是烧毁是什么原因?

附上电路图

vin是48v  输出24v  用来驱动风扇  3脚pwm 25k