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LM3405a噪音问题,求教

Other Parts Discussed in Thread: LM3405A

使用LM3405a做背光电路,原理图如下

PWM频率是120HZ,在占空比为100或者0也即是全黑和全亮的时候没有噪音,其他时候都会发出低频噪音,请问这个问题出在哪里?如何解决呢?