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关于UCD3138PFCEVM-026评估板的使用

Other Parts Discussed in Thread: UCD3138PFCEVM-026

板子型号:UCD3138PFCEVM-026

您好,今天在使用过程中,上电后Q6,Q7,Q8三个指示灯均不亮,R3冒烟、发热严重。

输入电压为AC 90V,限流1A输出负载为4K。

这个R3的在板子中的作用是什么呢?发生问题的原因可能是什么呢?