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LM3409驱动问题

Other Parts Discussed in Thread: LM3409, TPS92641

我们现在在开发一款需要与摄像头同步亮的LED灯具,每次收到脉冲触发信号就亮40us,平时关闭,我的LM3409驱动电路采用每次40us固定脉宽进行控制,经过测试,发现脉冲频率在100Hz以上时,lm3409能够按照预期工作,而当脉冲频率在60Hz以下时,LM3409的输出就没有任何反应,请问这是什么问题导致的,有什么解决办法吗,万分感谢!