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UCC2897A 为什么没有PWM输出



启动电压12.7V,

上电, 测量FB电压(5V),VDD电压(13V),VREF电压(5V),SS端电压(5V),LINUV电压(1.8V) lINOV电压(1V)

以上条件与输出为1 ,故使能输出。
求指导啊。这是为什么呢?