This post describes for the LED Drive IC.
The Part Number is WS2811. The package is SOP 8 Pin.
The function of this IC is 256 Gray level 3 channal Constant current LED drive IC.
The manufacturer of this part is WorldSemi ( http://www.world-semi.com ).
See the preview image and the PDF file for more information.
The WS2811 is 3 output channels special for LED driver circuit. It internal include intelligent digital port data latch and signal reshaping amplification drive circuit.Also include a precision internal oscillator and a 12V voltage programmable constant current output drive. In the purpose of reduce power supply ripple, the 3 output channels designed to delay turn-on function.
IC use single NZR communication mode.After the chip power-on reset, the DIN port receivedata from controller, the first IC collect initial 24bit data then sent to the internal data latch, theother data which reshaping by the internal signal reshaping amplification circuit sent to the next cascade IC through the DO port. After transmission for each chip,the signal to reduce 24bit. IC adopt auto reshaping transmit technology, making the chip cascade number is not limited the signal transmission, only depend on the speed of signal transmission.
1. Output port compression 12V.
2. Built in stabilivolt, Only add a resistance to IC VDD feet when under 24V power supply.
3. Gray level 256 can be adjusted and scan frequency not less than 400Hz/s.
4. Built in signal reshaping circuit,after wave reshaping to the next driver, ensure wave-form distortion not accumulate.