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您好,
那么VOUT是多少? FB管脚电压正常吗?
fsw的频率设置较低,这就需要较大的电感。
12v/1A的输出,请参考芯片数据手册“7.2 Typical Application”中电路和BOM.
LM5164 100V Input, 1A Synchronous Buck DC/DC Converter With Ultra-low IQ datasheet (Rev. C)