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LM5160: 启动异常,短暂发波后SS端、VCC和BST端口电压变为0

Part Number: LM5160

(BST端口电压)

(VCC端口电压)

(SS软启动电压)

(SW端口电压)

原理图,电感的取值为130uH,4路输出每一路的功率大致为0.5W。芯片已经更换了3片,每次启动都是这样子。