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LP8866-Q1: 无法点亮LED

Part Number: LP8866-Q1


如上图所示,LP8866的设计图,我们使用PWM控制,做的是一个背光驱动小板,配合MCU主板,PWM和EN脚是有10K上拉电阻的在主板上,供电12V,万用表测LED+为36.6V,OUT为18V,外接8颗串联灯珠无法点亮,请帮忙分析是什么问题,FB引脚测试2.7V,是不是不正常?INT引脚上拉了,但是实际测试为0V,应该是有故障中断产生,是否是FB引脚的问题,怎么解决