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关于LM3406的使用

Other Parts Discussed in Thread: LM3406

 按仿真工具对LM3406进行设计,结果发现电感有声音,经排查对比后,去除Cout(见手册,与LED负载并联)后,声音消失。

VIN=29,LED 额定电压22V左右,f=357KHZ,恒流设置0.56A,Cout=0.22uF.

 我想问的是,增加COUT会导致电感响,为什么好推荐使用这样的电路。

 另外,为什么会响,实测VOUT低电平为10V左右,去除COUT才能到0V,能否帮忙从原理上分析下,谢谢!