User Manual
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
1 0 0 R
1 0 4
3 3 R
5 V
3 3 R
B
G
R
1 0 0 R
1 0 4
3 3 R
5 V
V C C
L E D
c o n t r o l l e r
D A T
G N D
V D D O U T B O U T G O U T R
D I N
G N D
D O
G N D
W S 2 8 1 1
V D D O U T B O U T G O U T R
D I N
G N D
D O
G N D
W S 2 8 1 1
d e p e n d o n c o n t r o l l e r
3 3 R
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
1 0 4
3 3 R 3 3 R
B
B
B G
G
G R
R
R
1 0 4
3 3 R
1 2 V 1 2 V
V D D O U T B O U T G O U T R
D I N
G N D
D O
G N D
W S 2 8 1 1
V D D O U T B O U T G O U T R
D I N
G N D
D O
G N D
W S 2 8 1 1
V C C
L E D
c o n t r o l l e r
D A T
G N D
R 1
R 1
R R R R
3 3 R
d e p e n d o n c o n t r o l l e r
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 - 12LEDR V
RR=
KΩ
V
LEDR
is the red LED forward conduction voltage drop.