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关于外接pwm控制信号

Other Parts Discussed in Thread: LM3224, LM3532, TPS61161, TPS61165, TPS40211, TPS61185

LM2700-ADJ,LM2735X,LM3224ADJ这些芯片都能外接pwm控制信号来调节led的亮度吗?如果外接pwm亮度控制信号的话电路中需要做什么调整?