Worldsemi WS2811

The WS2811 is 3 output channels special for LED driver circuit. Its internal includes 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 receive data from controller, the first IC collect initial 24bit data then sent to the internal data latch, the other 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 280μs

There are SOP8, MSOP8 and FSOP8 packages available.

• OUTR, G, B and DOUT port withstand voltage 20V, DIN port withstand voltage 9.5V.
• Built- in voltage- regulator, only a resistor needed to add to VDD pin when under 24V power supply.
• Built- in resistors, DIN and DOUT ports have over- voltage protection. When short circuited to 24V, it will not burn out in a short time.
• 256 Gray- scale adjustable and scan frequency is 4KHz.
• Built in signal reshaping circuit, to ensure waveform distortion do not accumulate after wave reshaping to the next driver.
• Built- in electrify reset circuit and power- down reset circuit.
• Cascading port transmission signal by single line.
• Any two point the distance less than 4 Meters transmission signal without any increase circuit.
• When the refresh rate is 30fps, the cascade number is at least 1024 pixels.
• Send data at speed of 800Kbps.

• LED full color decorative lighting, such as LED string, LED strip, LED module etc.
• Indoor/outdoor LED video or irregular screen.
• LED consumer electronics.
• All kinds of LED lighting products.