Battery driven single LED, wide application of miner’s lamp, flashlight, emergency lights and other products. can find 20-400mA fixed current in led market. we will talk about LED backlight LCD driver ic. It is a very large size and according to the backlight LCD linear LED representation of the driver IC, linear IC power design as well as the feedback sampling automatically adapt to LED; VF value; 4 channel of LED constant current output, consistent with the R/G/B color combinations of 3:6:1 with high color rendering requirements. Can be applied to the high requirements of back light,The current market sales in good condition, more and more manufacturers adopt. The utility model has the advantages of simple design, simple circuit, convenient application, gray performance is currently the world’s one of the best (level 65536). The drawback is, these IC need large power supply and high cost for design.
The cost of power supply part is higher than LED driving part.
at present ,application of wash wall lamp, stage lighting, the screen lighting(seek higher requirements light ). Gray is very important performance factor for design in LED IC in the future. Single channel high power LED constant current DD311 driver ，it is the constant current driver for a single channel LED output, built-in current mirror and the current switch component, is designed for driving large power LED chip. it can drive up to 1 A input current (sink current), and through the adjustment of the reference input current (IREF) to arbitrarily set the size of the output current. The output current value is about 100 times of IREF, IREF by adjusting the external resistor or bias (bias) voltage to set the fine-tuning or make the bias voltage can be corrected LED light. it has achieved overall brightness at the same time adjustment. The output of the led chip can withstand voltage up to 36V, connecting application support multiple high power LED series. Built in output enable terminal (Enable), can easily achieve high gray scale application of high power LED. Features: the maximum output current: 1A (by the reference input current IREF settings) minimum output voltage requirements: 1V (when Iout = 1A) maximum output under voltage: 36V (output channel leakage current of less than 0.1uA).