Description
WS2811 SMD LED power driver IC SOP8
Feature
Output port compression 20V. DIN port compression 9.5V.
Built-in voltage-regulator tube, only a resistance needed to add to IC VDD feet when under 24V power supply.
256 Gray-scale adjustable and scan frequency is more than 2KHz.
Built in signal reshaping circuit, to ensure
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.
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