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PDF WS2811 Data sheet ( Hoja de datos )
| Número de pieza | WS2811 | |
| Descripción | Signal line 256 Gray level 3 channal Constant current LED drive IC | |
| Fabricantes | WorldSemi | |
| Logotipo |  |
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 1. Constant current LED drive IC  Hay una vista previa y un enlace de descarga de WS2811 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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Free Datasheet http://www.datasheet4u.net/
WS2811
Signal line 256 Gray level 3 channal
Constant current LED drive IC
Feature
Applications
l Output port compression 12V.
l Built in stabilivolt, Only add a resistance to IC
VDD feet when under 24V power supply.
l Gray level 256 can be adjusted and scan freque
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 reset circuit and power lost reset
circuit.
l Cascading port transmission signal by single lin-
e.
l Any two point the distance more than 10m tran-
smission signal without any increasecircuit.
l When the refresh rate is 30fps, low speedmodelc
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.
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 purpose of reduce power supply ripple, the 3 outp-
ut channels designed to delay turn-on function.
IC use single NZR communication mode.After the chip power-on reset, the DIN port receivedata from con
troller, 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.
The data latch of IC depend on the received 24bit data produce different duty ratio signal at OUTR,
OUTG, OUTB port. All chip synchronous send the received data to each segment when the DIN port input a
reset signal. It will receive new data again After the reset signal finished. Before a new reset signal received,
the control signal of OUTR ,OUTG, OUTB port unchanged. IC sent PWM data that received justly to OUTR,
OUTG, OUTB port, after receive a low voltage reset signal the time retain over 50us. We offer two package
SOP8 and DIP8.
http://www.world-semi.com
1 page  
Free Datasheet http://www.datasheet4u.net/
WS2811
Signal line 256 Gray level 3 channal
Constant current LED drive IC
Typical application circuit:
1.power supply is 5V with 1 LED and constant current (18.5mA) driving
5V 5V
depend on controller
VCC
DAT
GND
33R
100 R
104
BGR
VDD OUTB OUTG OUTR
DI N
WS2811
GND
DO
GND
33R
100 R
104
BGR
33R
VDD OUTB OUTG OUTR
DI N
WS2811
GND
DO
GND
33R
Fig 1
This driving mode use constant current output, the advantage of is the LED can retain luminance and
colour temperature when the power supply lessen. We require, in order to prevent power spikes phenomenon
and power reverse polarity, series a not more than 100ohm resistor at the po-wer supply pin(VDD). The capac-
itance 104 as bypass capacitor. To prevent the reflection and hot-swap protection, we suggest to connect a 33
ohm resistor at the data input or output port for impedance.
2.power supply is 12V with 3 LED and constant current(18.5mA) driving
12V 12V
BGR
BGR
BGR
BGR
BGR
BGR
depend on controller
R1
104
RR
VCC
DAT
GND
33R VDD OUTB OUTG OUTR
DIN DO
WS2811
GND
GND
33R
R1
104
RR
33R
VDD OUTB OUTG OUTR
DIN DO
WS2811
GND
GND
33R
Fig 2
The same as the front mode, it is also use constant current output. In this circuit, R1 is used as the IC
internal LDO divider resistance and the value is 2.7K. The capacitance 104 as bypass capacitor. To prevent the
reflection and hot-swap protection, we suggest to connect a 33ohm resistor at the data input or output port for
impedance. At the OUTR port we should add a divider resistance RR. The value of RR can be derived by
the following equation:
RR = 12 - 3VLEDR KΩ
18.5
VLEDR is the red LED forward conduction voltage drop.
http://www.world-semi.com
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet WS2811.PDF ] | |
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