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急求 LM3409 在调光时有啸叫声, Johnsin Tao 帮我解答谢谢

Other Parts Discussed in Thread: LM3409

本人目前有款产品(舞台灯)用到LM3409  ,现在有个问题就是在用控台调光时 60-100 时会有啸叫声。请知道的大侠帮我分析下,谢谢!

PWM 频率是4K, IN 36V  ,电流3.6A  ,驱动的LED 是100W 的白光.