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LM22676: lm22676 上电烧坏问题

Part Number: LM22676

lm22676 有时一上电就会烧坏,原理图如下 ,负载是风扇(每个风扇约500mA),输入端有tvs保护,输出电压是0到24V可调,帮忙看看是不是原理图有什么问题,谢谢!