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LM3421: 原理图与调试问题。

Part Number: LM3421

 烦请各位专业的大神提出修改参数以及电路意见,现在调整了些参数之后PWM调光到了77%就已经到达了设定输出电流5.5A了,并电感出现刺耳的声音。

问题二:如果我采用模拟调光输入的,是否输入电流源与ICSH进行计算?PWM输入引脚如何做处理?是否一直输出一个固定的信号。是否需要做zero current shutdown

电路参数:输入电压48V,最大恒流5.5A,LED电压为36V