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?
This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
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?
3404对输出是PWM控制方式的,
DIM端输出PWM信号,输出是一定占空比的PWM,如果悬空则最大,LED两端电压是输入电压减去3404的压降,此为最大值。