The working principle of the led driver ic: the chip contains a constant current generation circuit, which can set the output constant current value through an external resistor. The switch time of the output channel can be controlled through the enable side of the chip, and the switching frequency is up to one megahertz (1MHz). The current output response is extremely fast, supporting applications with high color level changes and high picture refresh rate. Built-in open circuit detection, overheat outage, and overcurrent protection greatly improve the reliability of the application system. Driving method: · The adjustment method of current value · The adjustment method of pulse amplitude modulation technology The adjustment method of current value is mainly to change the brightness adjusted by current value. Here, it is assumed that the luminosity is 1 times, the luminosity of white light and the luminosity of current change become 1.7 times, and the luminosity at this time becomes 3 times, although the illuminance and current value are not proportional. However, the red light is proportional, mainly because the physical properties of red, green and blue chips are different from each other.