DD311 is a single-channel constant current LED driver output, built-in current mirrors and current switching components, is designed to drive high-power LED chips designed to drive sink of up to 1 amp current (sink current), and can by adjusting the reference input current (IREF) to arbitrarily set the output current. Output current is about 100 times the IREF, IREF resistor or by adjusting external bias (bias) voltage setting. Enable fine-tuning or correction of bias voltage can be varied or LED brightness between the LED to achieve more stars the same time between adjusting the overall brightness. The chip can withstand up to 36V output voltage, multi-application high-power LED's in series. Built-in output enable (Enable), can easily achieve the high gray-scale application of high power LED, the maximum output enable frequency: 1MHz.