PT4115 Four-channel PWM dimming

mjhmjh

PT4115 Four-channel PWM dimming [Copy link]

Hi everyone, this is a PWM four-way dimming module I made using PT4115, but as long as it is connected to 24V and GND, without PWM wave input, all LEDs are always on. What's wrong?

topwon

Look at the chip specification, the DIM pin has an internal pull-up resistor. If it is left floating, it will be a high level, and the light will naturally light up. . . . .

qwqwqw2088

The PT4115 dimming circuit chip data is very clear, please read it carefully.