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LM3409HV利用PWM波调光问题

Other Parts Discussed in Thread: LM3409HV, LM3409

我是新手,有个LM3409HV调光问题,电路图如下,规格大小电路图上标出来了,但是当pwm波输出口与EN引脚连接时,灯不亮,其他芯片管脚都是交流,只有6引脚电压为0不变,Pmos管那里S级也没有电压,用的输入电源是5V的,LED灯功率比较小,5V左右,请问这怎么解决啊?在线等,急