Preliminary

WS2803

18-Channel Constant Current LED Driver

With Programmable PWM Outputs

1/8

WS-Preliminary-V0.1

http://www.world-semi.com

Features

Applications

●Supports both constant voltage and constant current drive mode

● LED decorative lighting

　

Constant output current range

● Indoor/Outdoor LED video or massage display

-5-30mA@5V supply voltage

-5-20mA@3.3V supply voltage

●18 constant current driving channels

● 30V high voltage output channels

● 8bit PWM gray level control

● Precision output driving current

Between channels in a chip: ±2 %

Between chips: ±4%

● Maximum clock frequency up to 25MHz.

● Free run ability

● Over temperature protection

General Description

The WS2803 is a constant current LED driver. It is designed for indoor/ outdoor LED displays and decorative LED

lighting system. It is suitable for LED cascading applications. The WS2803 ownes 18 output channels, each channel can

drive a constant current up to 30mA. WS2081 contains serial shift registers, data latches, output registers, band gap

reference voltage generator, internal oscillator, and programmable constant output current drivers. The serial data is read

into the shift registers at the rise edge of the external clock. The data and clock output buffers are designed for cascading

another chip. The output current can be set by connect a resistor at IREF pin to set the output current of each channel. The

over temperature protection is built in to protect the chip from thermal damage, if the core temperature level rise over 120℃,

the output current will be decreased to stable the core temperature within a safe level. The 2-wire control scheme can

reduce the system cost; it is very suitable for low cost LED decorative LED lighting systems.

WS2803 is available in both SOP-28 and DIP-28 package, the operating temperature is -40~85℃

Absolute Maximum Ratings

Parameter

Symbol

Ratings

Unit

Power Supply Voltage

VCC

-0.3 to 6V

V

Input Voltage

VIN

-0.3 to VCC+0.3V

V

Output Voltage

VOUT

-0.4 to 45V

V

VXOUT

-0.3 to 30V，IOUT off

V

Output Pin Voltage

VXOUT

-0.3 to 10V，

V

Output Current

Constant Current Drive Mode

IOUTCC

5 to 30

mA

Output Current Deviation

Between output channels

Between chips

DIOI

DIOE

±2

±4

%

Input Clock Frequency

FCLK

25

MHz

Maximum Power Dissipation

PD

2600

mW

Operating Junction Temperature

Topr

-40 to + 150

Storage Temperature Range

Tstg

-55 to + 150

Lead Temperature (Soldering, 10 seconds)

Tsolder

300

℃

ESD susceptibility

2000

V

Note:

If the voltage on the pins exceeds the maximum ratings may cause permanent damage to the device.