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WS2803 Schematic ( PDF Datasheet ) - Worldsemi

Teilenummer WS2803
Beschreibung 18-Channel Constant Current LED Driver
Hersteller Worldsemi
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Gesamt 8 Seiten
WS2803 Datasheet, Funktion
Preliminary WS2803
18-Channel Constant Current LED Driver
With Programmable PWM Outputs
Features
Supports both constant voltage and constant current drive mode
  Constant output current range
-5-30mA@5V supply voltage
[email protected] 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
Applications
LED decorative lighting
Indoor/Outdoor LED video or massage display
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
Output Voltage
Output Pin Voltage
Output Current
Constant Current Drive Mode
Output Current Deviation
Between output channels
Between chips
Input Clock Frequency
Maximum Power Dissipation
Operating Junction Temperature
VIN
VOUT
VXOUT
VXOUT
IOUTCC
DIOI
DIOE
FCLK
PD
Topr
-0.3 to VCC+0.3V
-0.4 to 45V
-0.3 to 30VIOUT off
-0.3 to 10V
5 to 30
±2
±4
25
2600
-40 to + 150
V
V
V
V
mA
%
MHz
mW
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.
1/8
WS-Preliminary-V0.1
http://www.world-semi.com






WS2803 Datasheet, Funktion
Preliminary WS2803
18-Channel Constant Current LED Driver
With Programmable PWM Outputs
Fig 4, WS2803 timing chart with 2-wire control in cascading application
6/8
WS-Preliminary-V0.1
http://www.world-semi.com

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