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LED驱动芯片LM3404

Other Parts Discussed in Thread: LM3404

请问当LM3404 DIM端输入不同占空比的PWM波时,其加在LED两端的电压是大小变换的,还是同样是PWM形式的输出,。还有当接入输入电压后,DIM处于端悬空状态时,LED两端电压又是怎样的?