WS2811

Signal line 256 Gray level 3 channal

Constant current LED drive IC

http://www.world-semi.com

Typical application circuit:

1.

power supply is 5V with 1 LED and constant current (18.5mA) driving

B

G

R

100R

104

33R

5V

33R

B

G

R

100R

104

33R

5V

VCC

DAT

GND

VDD OUTB OUTG OUTR

DI N

GND

DO

GND

WS2811

VDD OUTB OUTG OUTR

DI N

GND

DO

GND

WS2811

depend on controller

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

B

B

B

G

G

G

R

R

R

104

33R

33R

B

B

B

G

G

G

R

R

R

104

33R

12V

12V

VDD OUTB OUTG OUTR

DI N

GND

DO

GND

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VDD OUTB OUTG OUTR

DI N

GND

DO

GND

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VCC

DAT

GND

R1

R1

RR

RR

33R

depend on controller

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:

5

.

18

3

-

12

LEDR

V

RR

=

KΩ