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关于DCP021212U输出问题



最近使用了一片DCP021212U的片子,输入VIN12=12V,电阻电容如原理图,电容都为陶瓷电容,电阻为0603贴片电阻。但是输出VCC12在13v左右,VCC-12V输出始终为零。希望各位指点一下。