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WS2801 Schematic ( PDF Datasheet ) - Worldsemi

Teilenummer WS2801
Beschreibung 3-Channel Constant Current LED Driver
Hersteller Worldsemi
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Gesamt 15 Seiten
WS2801 Datasheet, Funktion
Preliminary WS2801
3-Channel C onstant Current
LED Driver With Programmable
PWM Outputs
  Features
  Applications
• Supports both constant voltage and constant current drive mode • LED decorative lighting
• Programmable constant LED drive current
• Indoor/Outdoor LED video or massage display
• Wide constant output current range 5~150mA
• PWM signal generator
• Build in PWM dimming scheme for each output channel,
• LCD TV back lighting
supports free-run, especially suitable for low cost controller
application
• PWM free-run capability(refresh rate(2.5KHz)
• Build in buffers to cascading data and clock to the next driver
• Output polarity reverse function
• Support hot swap
• Maximum input clock frequency 25MHz
• Power supply voltage 3.3~5.5V
  General Description
The WS2801 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 WS2801ownes 3 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 polarity reverse function is
designed for driving high power LED by adapting the application circuitry. The WS2801 adopts the reliable 2-wire scheme, which
features low EMI transport, very strong anti-interference ability, and support hot-swap. The 2-wire control scheme can reduce the
system cost; it is very suitable for low cost LED decorative LED lighting systems.
WS2801 is available in both SOP-14 and DIP-14 packages, the operating temperature is -40~85
  Pin Configurations
 
  Typical Application Circuit
Fig1.a SOP-14 package
 
Fig1.b DIP-14 package
WS-Preliminary-V0.3
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WS2801 Datasheet, Funktion
Preliminary WS2801
3-Channel C onstant Current
LED Driver With Programmable
PWM Outputs
Figures
30.1
30.05
30
29.95
29.9
29.85
29.8
29.75
29.7
29.65
29.6
29.55
34
Iout vs. VCC
VCC(V)
5
5.5
VFBvs temp
0.63
0.62
0.61
0.6
0.59
0.58
0.57
-40 -20 0
20 40 60 80 100 120
Temp.
Output current vs. Temp (RFB=20)
IOUT vs.VOUT
Feed back voltage vs. temp.
IVCC vs. Temp.
30.1
30.05
30
29.95
29.9
29.85
29.8
29.75
29.7
29.65
29.6
2
345 VOUT(V)
1400
1200
1000
800
600
400
200
0
-40 -20 0 20 40 60 80 100 120
Temp.()
Output current vs. output voltage
IVCC vs. Temp.
WS-Preliminary-V0.3
6 /15
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6 Page









WS2801 pdf, datenblatt
Preliminary WS2801
3-Channel C onstant Current
LED Driver With Programmable
P WM Output
WS-Preliminay-V0.3
Fig 10, WS2801 data format and timing
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