Constant current LED drive IC
Feature
l Output port compression 12V .
l Built in stabilivolt, Only add a resistance to IC喜剧英文
VDD feet when under 24V power supply.
l Gray level 256 can be adjusted and scan freque三颗针的功效与作用
ncy not less than 400Hz/s.
l Built in signal reshaping circuit,after wave resha-ping to the next driver, ensure wave-form distor-tion not accumulate.
l Built-in electric ret circuit and power lost ret
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circuit.
l Cascading port transmission signal by single lin-e.
l Any two point the distance more than 10m tran-smission signal without any increacircuit.
l When the refresh rate is 30fps, low speedmodelc
棘轮ascade number are not less than 512 points, hig-h speed mode not less than1024 points.
l Send data at speeds of up to 400 Kbps and 800
Kbps two patterns.
Applications
l LED decorative lighting.
l Indoor/outdoor LED video or irregular screen.
General description
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 purpo of reduce p
ower supply ripple, the 3 outp-ut channels designed to delay turn-on function.
IC u single NZR communication mode.After the chip power-on ret, the DIN port receivedata from con troller, the first IC collect initial 24bit data then nt to the internal data latch, theother data which reshaping by the internal signal reshaping amplification circuit nt 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.
The data latch of IC depend on the received 24bit data produce different duty ratio signal at OUTR, OUTG, OUTB port. All chip synchronous nd the received data to each gment when the DIN port input a ret signal. It will receive new data again After the ret signal finished. Before a new ret signal received, the control signal of OUTR ,OUTG, OUTB port unchanged. IC nt PWM data that received justly to OUTR, OUTG, OUTB port, after receive a low
voltage ret signal the time retain over 50us. We offer two package SOP8 and DIP8.
Constant current LED drive IC PIN configuration
招聘专员工作内容PIN function
婴儿睡觉时间
Absolute Maximum Ratings
device.
Constant current LED drive IC Electrical Characteristics（T A=-20～+70℃，V DD=4.5～5.5V,V SS=0V,unless otherwi specified）
Switching characteristics（T A=-20～+70℃，V DD=4.5～5.5V,V SS=0V,unless otherwi specified）
Low Speed mode time
Constant current LED drive IC
Sequence chart:
0code
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1code
RET code
Cascade method:
Data transmission method:
Note: The data of D1 is nd by MCU,and D2, D3, D4 through IC internal reshaping amplification to transmit.
Composition of 24bit data:
ret code
Constant current LED drive IC Typical application circuit:
1.power supply is 5V with 1 LED and constant current (18.5mA) driving B
G
100R
104
33R
5V
VCC
L E D c o n t r o l l e r
DAT GND
VDD OUTB OUTG OUTR DIN GND
W S 2811
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depend on controll er
This driving mode u constant current colour temperature when the power supply lesn. and powe
r rever polarity, ries a not more itance 104 as bypass capacitor. To prevent the ohm resistor at the data input or output port 2.power supply is 12V with 3 LED
