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UCC28019A: GATE 输出PWM频率 50hz

Part Number: UCC28019A

我最近按照手册用UCC28019A搭建了一个输入AC24V,输出DC36V的PFC电路。输出没有升压。检查后发现芯片GATE引脚输出PWM的频率为50hz,请问这是什么原因?如何解决?