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WS2803 데이터시트 PDF




Worldsemi에서 제조한 전자 부품 WS2803은 전자 산업 및 응용 분야에서
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부품번호 WS2803 기능
기능 18-Channel Constant Current LED Driver
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WS2803 데이터시트, 핀배열, 회로
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 pdf, 반도체, 판매, 대치품
Preliminary WS2803
18-Channel Constant Current LED Driver
With Programmable PWM Outputs
Pin Description
SOP-28
Pin No.
1
2
3
4
5
6~23
24
25
26
27
28
Pin Name
GND
IREF
NC
CKI
SDI
OUT0~17
SDO
CKO
NC
NC
VCC
Pin Description
Ground
A resistor connected to this pin can set the output constant current.
None connection
Data clock input
Serial gray scale data input
Constant current output terminals
Buffered serial data output
Buffered clock output
None connection
None connection
VCC input
DIP-28
Pin Port
1
2
3
4
Pin Name
GND
IREF
NC
CKI
Pin Description
Ground
A resistor connected to this pin can set the output constant current.
None connection
Data clock input
5
6~23
24
25
26
27
28
SDI
OUT0~17
NC
NC
SDO
CKO
VCC
Serial gray scale data input
Constant current output terminals
None connection
None connection
Buffered serial data output
Buffered clock output
VCC input
Application note:
Output Constant Current
In LED display and decorative applications, WS2803 provides nearly no variations in current from channel to channel
and from IC to IC. This can be achieved by:
1) The maximum current variation between channels is less than 2%, and between chips is less than 4%.
2) In addition, the current characteristic of the output stages is flat and users can refer to the figures as shown below.
The output current can be kept constant regardless of the variations of led forward voltages (VF). This performs as a
perfection of load regulation.
Adjusting the output current
The output current of each channel can be set by an external resistor, REXT, the output current can be set by the
following formula:
I OUT
= V REXT
R EXT
× 22
Where, REXT is the resistance of the external resistor connected to REXT terminal, and VREXT is the voltage of REXT pin
WS-Preliminary-V0.1
4/8
http://www.world-semi.com

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WS2803 전자부품, 판매, 대치품
Preliminary WS2803
18-Channel Constant Current LED Driver
With Programmable PWM Outputs
The Connection and Driving of Cascading Operation
The transmit the data over long distance by cascading, the WS2803 integrates push-pull output stage with strong
driving capability which enables the data and clock can be transmitted up to 6 meters at 2MHz clock frequency.
To prevent the reflection, it is necessary to connect a 50resistor at the data input or output port for impedance match.
Package Information
SOP-28 package (Unit:mm)
WS-Preliminary-V0.1
Fig 6.a SOP-28
7/8
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