LED Lighting Solutions for Traffic Signals

LED Lighting Solutions for Traffic Signals
ST Position:• #1 in Lighting Segment*• #2 in Power Management**

ST Expertise:• System Solutions• Technology Integration
and Innovation• Excellent Technical Support*STMicroelectronics, Datapoint and Darnell - 2008**iSupply - 2010

Content LED Lighting Solutions for Traffic Signals
 LED Array Driver Features/Benefits Error Detection/Diagnostics
 Auto Power Savings/Shutdown
 High Precision
 Balanced Turn-on/off

 System Evaluation Boards and Tools
 HB LED driver solution with Diagnostics (32, 40 LEDs)
 16 x 32 LED Matrix Display Panel RGB LED driver for Color Displays and Backlighting
 High Brightness LED Array Dimmer Solution
 RGB Moving Message Display System LED Driver w/PWM Dimming and Boost Converter Solution

LED Lighting Solutions for Traffic Signals

Main LED applications: Traffic Panels/Matrix
 Aviation
 Rail Navigation
 Emergency/Police Signals
 Cross Light

STP08DP05,
STP16DP*05, STP24DP05
Families, LED7706/7

STPXX Array Drivers•Constant-current drivers, set by
only one external resistor•Serial data and clock
resynchronization•High current and high precision•Thermal shutdown•Error detection and auto powersaving
LED7706/7 DC/DC Converters

LED Array Driver general portfolio
STPXXYY05 Series Features
Absolute Output Voltage up to 20V
Output Enable frequency up to 1MHzSDI and CLK re-synchronized device by device w/o use of
CLK falling edge
Analog Thermal Shutdown protection
Extended Junction
Clock frequency over 30MHz,
Temperature range of
TSSOP package with exposed pad– 40o to125 C

C= Constant current
P= Precision
PP = Precision and lower output
current range (3-40mA output
current)
D= Error Detection/Diagnostic
S = Auto-Shutdown

Iout

Bit
Prec.

Chip
Prec.

Evaluation Board

8-bit C.C. LED driver

5-100mA

+/-1%

+/-3%

STEVAL-ILL009V5

STP08DP05

8-bit C.C. LED driver
w/Diagnostics

5–100mA+/-1.5%+/-5%

STEVAL-ILL002V3
STEVAL-ILL002V4

STP16CP(P)(S)05*

16-bit w/AutoPower-Saving

5–100mA+/-1.5%+/-5%

STEVAL-ILL003V2

STP16DP(P)(S)05

16-bit with Diagnostics

5–100mA+/-1.5%+/-5%

STEVAL-ILL025V1

STP1612PW05

16-bit w/12/16 bit e-PWM

3–80mA+/-1.5%+/-6%

STEVAL-ILL028V1

STP24DP05

24-bit with Diagnostics

3–80mA

+/-3%

+/-8%

STEVAL-ILL015V1

Part Number

Description

STP08CP05*Also available as STP16CPC05, STP16CPC26 with balanced turn-on/turn-off featureLED Array Drivers Portfolio w/Features
Standard constantcurrent LED arraydrivers

STP08CP05, STP16CP05, STP16CPC26

Low current/highaccuracy

STP16CPP05, STP16DPP05,
STP16CPPS05, STP16DPPS05

LED array drivers

STP08DP05, STP16DP05, STP16DPP05,
STP16DPS05, STP16DPPS05

LED array drivers
withError Detection

STP16CPS05,
STP16CPPS05,
STP16DPS05, STP16DPPS05

LED array drivers
withAuto Shut-Down
LED array drivers
withBalanced TON/TOFF
LED array drivers with

PWM brightness
control
LED array drivers for

RGB solutions

STP16CPC05, STP16CPC26
STP1612PW05
STP24DP05

STP08DP05 – 8 ch, 5-100ma Drivers
Key Features:
 Short and open output error detect
 Low-voltage power supply (3V – 5.5V)
 8 constant-current output channels
 8-bit shift register Serial data IN/parallel data OUT
 Output current: 5-100 mA
OE/DM2
 Adjustable output current thru ext resistor
LE/DM1
 Maximum clock frequency: 30 MHz
 3.3V microcontroller driver-able
SDI
 Current accuracy: +/-1.5% between bits
CLK
 STP08CP05: +/-3% between ICs
 STP08DP05: +/-5% between ICs

 ESD protection: 2.5 kV HBM, 200V MM
 Extended thermal shut-down and protection features

DIP16

TSSOP16(Exposed
Pad)

TSSOP16

SO-16

OUT 0 OUT 1

ThermalShutdown

OUT 7

Analog Stage

R-EXT

Open/Short Circuit Detector
Control
Logic

Latch and Enable
8 bit Shift Register

SDO

STP08DP05 LED Driver w/Diagnostics
Evaluation Board Solutions
Key Features:
40 LED Matrix with
 Error detection
 Current regulation
 Adjustable brightness
 Animated text implemented
 Adjustable blinking speed
 GUI SW for LEDs diagnostic
 Input voltage from 7V to 32V
 DC/DC Converter for high efficiency
 Standard supply connector
Key Products:
 STP08DP05 LED constant current driver ST7FLite39 8-bit microcontroller (10-bit
ADC, SPI, SCI communication)
 LE50AB
Linear voltage regulator
 ST3232C
RS-232 Drivers and Receivers
 L5970D
DC/DC Converter
Evaluation board

App note

Description

STEVAL-ILL002V3 (Osram LEDs)
STEVAL-ILL002V4 (Vishay LEDs)

AN2478, AN2415

High-brightness LED driver with diagnostics (40LEDs) demonstration board

STP16CP(S)05 or STP16DP(S)05
16 channel, 5-100mA LED Array Drivers
Key Features:

OUT 0 OUT 1 OUT 15

 Low-voltage power supply: (3V to 5.5V)
ThermalR-EXT
 16 constant-current output channels
Analog Stage
Shutdown
 16-bit shift register Output current:
Open/Short Circuit Detector
 5 to 100mA for STP16*P05 series
Power
Control
OE/DM2Latch and Enable Adj output current - ext resistor
SavingLE/DM1Logic
 3.3 V microcontroller drivable
Detection
SDO Maximum clock frequency: 30 MHz
SDI
16 bit Shift Register Current accuracy:
CLK +/-1.5% between bits
 +/-3% between ICs
 ESD protection: 2.5 kV HBM, 200V MM
 Extended thermal range and protection
features Short and open output ERROR DETECT:STP16DP05 and STP16DPS05
 Auto Shut-Down:
STP16CPS05 and STP16DPS05
SO-24
QSOP-24
 Bal output rise/fall time, typ 100ns:
STP16CPC05
TSSOP24TSSOP24(Exposed Pad)STP16CP/DP05 LED Driver Eval Board
Key Features:
32 LED Matrix with
 Current regulation
 Adjustable brightness
 Animated text capability
 Adjustable blinking speed
 GUI SW for LEDs diagnostic
 Input voltage from 5V to 35V
 DC/DC Converter for high efficiency
Key Products:
 STP16CP05 LED constant current driver STP16CPS05 LED constant current driver w/auto
power saving/shut down ST7FLite09
8-bit microcontroller
 L78L33AC
Voltage regulator
 STPS340U
Schottky diode L5970D
DC/DC converter
Evaluation board

Application
note

STEVAL-ILL003V2

AN2141

Description
High-brightness 32-LED evaluation board without
diagnostic based on the STP16CP05 LED driverSTP16DP05 LED Driver w/Diagnostics
Evaluation Board Solution
Key Features:
 16 x 32 LED Matrix display with STP16DP05
 Mother/slave board for LED display based on
STM32 uCtlr
 Supports up to 8 add’l display units in series
 Controlled by a single control unit supporting
up to 254 display units
 Configurable through Windows HyperTerminal
via serial interface and thru PS2 keyboard
 GPS Interface
 Audio Output -Playback of Pre-recorded .wav
files

Key Products:
 STP16DP05
 STM32F103
microcontroller
 STM1001
 ESDALC6V1W

LED display driver
32-bit ARM-based

STEVAL-ILL024V1
LED Matrix Control Unit
based upon STM32F103VBSTEVAL-ILL025V1
Shows Capability of
STP16DP05 in driving
Matrix LED Display panel

Reset IC
Quad Transil

Evaluation boards

User Manual

Description

STEVAL-ILL025V1/STEVAL-ILL024V1
LED matrix control unit

UM0767

Demonstration boards based on the STP16DP05 LED matrix
driver and the STM32F103VB

Error Detection/Diagnostic Mode
Detects Open and Shorts LED
on the Output

ERROR DETECTIONNORMAL MODE
Device works like a ConstantCurrent LED Driver
Detection
conditions
IODEC ≤
0.5 x IODIAGNOSTIC MODE
The LED Driver enters the Diagnostic mode byusing a Digital Key input to the SERIAL DATA
IN

Detection results
OPEN LINE (1) or
OUTPUT SHORT TO GND(2) detected

IODEC ≥
0.5 x IONO ERROR DETECTED

VO ≥ 2.4V

SHORT ON LED (3) or
SHORT TO VO (4)VO ≤ 2.2V

NO ERROR DETECTED

Vo=LEDs
voltage
Vo=LEDs voltage
supply supply

Next LED Array1
NormalMode
Normal Mode
SerialData
Serial Data

OR

4

3
STP16DP05

SDI
SDI

Diagnostic Mode
Diagnostic
Mode
using
a Digital
Key
using a Digital
Key

STP16DP05

SDO SDI
SDO
SDI
REXT
R
EXT

NormalNormal Mode
Mode
SerialData
Serial Data

SDO
SDO
EXT
RREXT

OR

2
Diagnostic
ModeDiagnostic
Mode
DataResult
ResultSerialSerial
Data

Error Detection availability: STP08DP05 ,STP16DP05, STP16DPS05, STP16DPP05,
STP16DPPS05, and STP24DP05, STP24GPL05, and STP1612PW05

AutoPower Saving/ShutDown ModeNO Active Data Latched

Automatically Shuts Down

First Active Data Latched

Automatically Powers Up

At Io = 80mA,• Active: IDD (ON) = 11.7mA (typ)• Not Active: IDD (Shut-down) = 100uA (typ)IDD(SHUT-DOWN) is 117 times
less than IDD(ON)

EXAMPLE• LED panel size: 10m x 5m
• Estimated number of LED Drivers: 10,000 pcs• LED drivers active at any one time : ~ 20%
 Using std LED driver  All 10,000 will consume
high current (approx 117 A)
 Using STP16DPS05  Only 2,000 will consumer
high current (approx 23 A)
Power savings using STP16CPS05 is ~ 80 %Auto Shut-Down available in STP16CPS05,
STP16DPS05, STP16CPPS05, STP16DPPS05

STP16CPP/DPP05 - 16 ch, 3-40mA
High Accuracy LED drivers
Key Features: Low-voltage power supply: (3V to 5.5V)
 16 constant-current output channels
 16-bit shift register
OE/DM2
 Serial data in/parallel data out LE/DM1
 3.3V microcontroller driver-able
 Maximum clock frequency: 30 MHz SDI Output current:
CLK 3 to 40mA (adjustable throughexternal resistor)• Current accuracy: +/-0.5% @ 20mA
 +/-2% @ 3mA
 ESD protection: 2.5 kV HBM, 200 V MM
 Extended thermal range and protection
featuresAuto Shut-Down available:
STP16CPPS05 and
STP16DPPS05

OUT 0 OUT 1 OUT 15
ThermalShutdown

R-EXT

Analog stage

Open/Short Circuit Detector
Power
Control
Latch and Enable
Saving
Logic
Detection
SDO
16 bit Shift Register
STP16DPP05

QSOP-24

SO-24

TSSOP24TSSOP24(Exposed Pad)

STP24DP05 – 24 channel, 5-80mA
OutputEnableREXTG

RED analog stage

Open/Short Circuit Detector

ThermalShutdown

Control Logic

GREEN analog stage

Open/Short Circuit Detector

R8 REXTR

Open/Short Circuit Detector

REXTB
 Low-voltage power supply: from 3V5.5V
B8
 24-bit shift registers
 Serial data in/parallel data out
B2 3 groups (RGB) of 8 constant-current
output channels from 5-80mA
B1
 Short and Open output error detection Adjustable output current throughOE-B
external resistor for each group of 8LE/DM1
channelSDI Gradual output delay (30ns for each
CLK
group RGB)
 3.3 V microcontroller driveable
 Maximum clock frequency: 25 MHz
 ESD protection: 2.5 kV HBM, 200 V MM
Thermal Shutdown with flag pin
Applications: Full color high resolution LED panel
displays
 Colored traffic signs

OE-R/DM R1 R2BLUE analog stage

Key Features:

G1
G2
G8

OutputEnableOutputEnableOE-G

8x3 Data Latch
8x3 Shift Register

SDO

TQFP48(Exposed
Pad)
TQFP48(Exposed Pad)HB RGB Dimmer Evaluation Board
Based on STP24DP05 and STM32F103C6Open Jumpers

Key Features:

STP24DP05 for Error
STM32
USB
USB connector
Open jumpers for
STM32 microcontroller
STP24DP05 LED Drivers
Microcontroller Connector LED Drivers Simulation
error simulation

 Two STP24DP05 (TQFP48) w/16 RGB highInput
brightness LEDs connected (48 LEDs in total) Input voltage
Voltage
7-18V STM32 with cost-effective internal HS osc
Shortjumpersfor
Short
Jumpers
7-18V
error simulation
for Error
High efficient switching power supply DC/DC
Simulation
ST1S10 with input voltage range of 7,5V JTAGJTAG
RGB LEDs
programming
programming
18V, current 0.7A.
connector
connector
RGB LEDs Error Detection Feature/Over-Temp Flag Adjustable Brightness
.JTAG interface for C firmware updates
LEDLED
Error Flag
Temperature FlagRESET Buttons
Buttons KnobKnob
Error OverOverRESET button
buttonFlag
Temperature Mini USB connector for PC GUI connection
Flag Imp signal test points for lab evaluation
 Buttons and a knob to control the board.
Demo Kit Support:
 3 jumpers each for simulating disconnection
 STEVAL-ILL015V1with OSRAM LEDs
and simulating shortage of 3 LEDs
 CD with User Manual, Application Note, Datasheets
 C Library for dimming control of every single LED
Key Products:
 Demo Firmware and PC Software:
 STP24DP05
 Stand alone: A game, color dimming effects, Error STM32F103
Detection
 ST1S10
 USB demo: Error Detection over USB
Evaluation board

App Notes /User Manuals

Description

STEVAL-ILL015V1

AN2841, UM0574, UM0588

High Brightness RGB LED Array dimmer demo board
based on the STP24DP05 and STM32

Multicolor LED Display Panel Eval Board
RGB Moving Message Display System with STP24DP05 and STM32F103
Key Features:
 Control unit with PS2 keyboard interface
for data entry
 LCD on control unit for showing thedisplay text and background color options
 4xSTP24DP05 for each display panel
 8 panels can be cascaded in series
through flat ribbon cable System configuration in typing data modeor in audio playback mode or in demo
mode

Key Products:
 STP24DP05
 STM32F103
control board
 STM1001
 STPS3L60
 ST3232C

LED Display Driver
32-bit microcontroller on

STEVAL-ILL032V1

STEVAL-ILL033V1

Support:Reset IC
Schottky Diode
3V RS232 com interface

 Full color Display Panels
 Airport and Railway information system
 Bank currency conversion rate boards

Evaluation board

User Manuals

Description

STEVAL-ILL032V1, STEVAL-ILL033V1

UM1449

STM32-based RGB LED Matrix Display DemoLED Array Driver Feature Summary
ΔILEDPart Number

#ch

ILED
(mA)

STP08CP05

8

STP08DP05

Error
detection

Auto
Power
SavingBalanced

Channel tochannel (MAX)

IC to
IC
(MAX)

5 - 100

3% (20 100mA)

6%

8

5–
100

3% (20 100mA)

6%

STP16CP05

16

5 - 100

3% (20 100mA)

5%

STP16CPS05

16

5 - 100

3% (20 100mA)

5%

STP16DP05

16

5 - 100

3% (20 100mA)

5%



STP16DPS05

16

5 - 100

3% (20 100mA)

5%



STP16CPP05

16

3 - 403%(20 40mA)

5%

STP16CPPS05

16

3 - 403%(20 40mA)

5%

STP16DPP05

16

3 - 403%(20 40mA)

5%

STP16DPPS05

16

3 - 403%(20 40mA)

5%

STP16CPC05

16

5 - 100

3% (20 100mA)

5%



STP16CPC26

16

5 - 90

3%

6%



STP24DP05

24

5 - 806% (5 15mA)
3% (15 80mA)

6%



STP1612PW05

16

3 - 601.5% (3 60mA)

6%



Turn
ON/OFF

Grayscale
Brightness
control

Current
Gain
Adjustment

Staggered
output
delay


















Array Driver Eval Boards Summary
Part Number

App
Notes

Power
SupplyAN2241

Std
SupplyConnector- Animated Text
- Adjustable Blinking Speed- GPS Interface

UM0767

5V, 0.5A
3.5V-5V,
3A

STEVAL-ILL028V1

RGB LED Driver w/Indep
PWM for Color Display
via STM32 SPI-Adjustable Color- JTAG interface for C firmware updateUM0882
UM0885Std
SupplyConnector

STEVAL-ILL002V3

40 LEDs Diagnostic
Reference Board Using
OSRAM Blue LEDs

- Adjustable Brightness, Blinking Speed- Animated Text
- Error Detection Feature

AN2415
AN2478Std
SupplyConnector

STEVAL-ILL002V4

40 LEDs Diagnostic
Reference Board Using
Vishay Green LEDs

-Adjustable Brightness, Blinking Speed- Animated Text
- Error Detection Feature

AN2415
AN2478Std
SupplyConnector- Adjustable Brightness- JTAG interface for C firmware update- Mini USB connector for PC GUI- Error Detection Feature

Order CodeDescription

FeatureSTP16CP05
STP16CPS05

STEVAL-ILL003V2

32 LEDs Array Reference
Board- Adjustable Brightness, Blinking Speed- Animated Text
- GUI SW for LEDs diagnostics

STP16DP05

STEVAL-ILL024V1
STEVAL-ILL025V1

Mother/slave board for
LED display based on
STM32 16x32 LED matrix

STP1612PW05

STP08DP05

STP08DP05

STP24DP05

STEVAL-ILL015V1

16 RGB LED Array basedon STP24DP05 andSTM32F103C6

STP24DP05

STEVAL-ILL032V1
STEVAL-ILL033V1

STM32-based RGB LED
Matrix Display Demo

- Adjustable text color and speed- Adjustable background color- Audio Playback Mode

UM0574Std
SupplyConnector

UM1449Std
SupplyConnector

Using DC-DC Switching Regulators
In Driving LEDs
Monolithic solutions offer high efficiency and compactness, wide input voltage range,high current capability for a variety of applications, and high dimming performancefor superior brightness uniformity.

LED770x

Boost for multi-rows
applications

DC BUS powered applications

Optimized LED driving solution
LED7706 and LED7707
DC-DC
Converter
DC-DC converter

DC-DC
DC-DC

converter
Converter

SerialDC-DC
DC-DC
Converter
converter

ParallelMultiple channel

 simpler architecture brightness uniformity
 high voltage tomanage low voltage
 high complexity due tocurrent matching high power dissipation on
current generators

 Typical input bus available  24V
 LEDs to drive  up to 10(e.g. considering 40V technology)

LED770x Trade-off based on: technology availability(rated voltage) efficiency
 LED current regulation

NEED FOR BOOSTCONVERSIONLED7706/7: LED Controllers
BOOST SECTION
 4.5V to 36V Input Voltage range
 Internal +5V LDO
 Internal Power-MOSFET Up to 93% Efficiency
 Up to 36V Output Voltage
 200kHz to 1MHz Switching Frequency
 Fixed FSW Peak Current Mode control
 Programmable Soft-Start Duration
 Programmable OV and OC Protections
 Single Ceramic Output Capacitor
 External sync for multi-device application

BACKLIGHT DRIVER SECTION Six ROWs capable of driving multiple LEDs inseries (e.g. up to ten WLEDs per ROW)
 Programmable Output Current per ROW

Input voltage
range: 4.5V
to Vout
Internal
Power-MOS

Internal +5V
LDO

Shorted LED
and open row
management
PWM
dimming Up to 30mA (LED7706)
 Up to 85mA (LED7707)

 PWM Dimming
 500ns minimum dimming ON time (LED7706)
 10uS minimum dimming ON time (LED7707)

 2% Current Matching between ROWs
 Shorted LED Fault Detection
 Open ROW Fault Detection
 Capability to Disconnect Unused ROWs

LED7706 /7

Output voltage:
up to 36V

Six rows, up to 10
WLEDs each
Up to 30mA (LED7706)
85mA (LED7707
programmable output
current

Ideal for:Industrial: traffic signals, lighting, and displays
Industrial: mid to large size LCD TV, MNT
Automotive: navigation displays and dash board

LED7706/7: Adaptive Output Voltage
Higher power dissipation

Fixed output voltage
VF spread

Adaptive output voltage
Output voltage
depends on the active
LED string with highest
VF

Minimization of thepower dissipation on thecurrent generators

Example• VIN = 12V• 6 strings of 8 LEDs
• VF,LED = 3.5 0.2V
• fSW = 600kHz• IROW = 75mA

5*N*VFmin
5*N*V
FMIN

N*VFMAX
N*V
FMAX
ILED
ILED
BOOST
BOOST

LED7707
LED7707η = 84.2% (fixed VOUT approach)η = 87.3%* (adaptive V approach)
23

OUT

0.7V

*0.5% lower every 100mV of increase of thevoltage across the master generators

LED7706/7: Boost topology
VIN= 4.5V to 36V

VOUT= up to 36V

Wide input
voltage range
+5V

OVP

LDO

High
efficiency

RRILIM
C L
T O
R G
L I
C

Fault
EnableCURR
GEN(LED7707@VOUT=34V, IOUT=350mA)

95%

η

VREF

LED770x
PWM Dimming

Input voltage: 4.5V to 36V
Maximum RMS switch current: 2.5A
Parallelable channels for higher current(LED7707)

Up to 10white LEDs
per row

I LED =KRRRILIM

90%
14V

INPUT VOLTAGE

24V

LED current:
up to 85mA/ch (LED7707)

Channel to channel current mismatch: ±2%
Up to 20kHz PWM dimming (1%-100%, LED7706)

LED Faults & Dimming Waveforms
1) ROW0
Opens2) The output
voltage increases
3) If 95% is crossed,
the faulty ROW is
disconnected

1) LED Short
Circuit: the ROW0
Voltage Increases
2) If the 3.4V
threshold is crossed,
the device is turnedoff (MODE=0)

Detecting and Managing Faults in LED7706/7

20µs Dimming
On-Time500ns Dimming
On-Time(fDIM=10kHz, DDIM=20%, fSW=630kHz, LED current=20mA)

Managing Dimming Waveforms in LED7706/7

LED7706/7 LED Driver Application Examples
Slope Comp OVP selectSlope Comp OVP selectSwitching Freq SelectInternal MOS OCP
Rows current selectSwitching Freq SelectInternal MOS OCP
Rows current selectUp to 10 High
Brightness (510mA)
WLEDs

Up to 10 WLEDs per row
Dimming
Fault
EnableFault Management SelectSync Output

Typical application schematic

660kHz MASTER

Dimming
Fault
EnableFault Management SelectSync Output

High-Brightness LED driving solution

660kHz Daisy-Chained SLAVESMulti-device applications with external Synchronization

LED Driver w/Boost Converter Solution
Based on the LED7706 and LED7707
Key Features:
Boost section
 4.5 V to 36 V input voltage range
 Internal power MOSFET Internal +5 V LDO for device supply
 Up to 36 V output voltage
 Constant frequency peak current-mode
control 200/250 kHz to 1 MHz adjustable switchingfrequency (LED7706/7)
 External sync for multi-device application
 Pulse-skip power saving mode at light load
 Programmable soft-start Programmable OVP protection
 Single ceramic output capacitor
 Non-latched thermal shutdown

STEVAL-ILL020V1

STEVAL-ILL021V1

LED driver section
 Six rows with 30/85 mA maximum current
capability (adjustable) LED7706 /7
 Up to 10 white LEDs per row
 Rows disable option
 Less than 500 ns minimum dimming time
(1% minimum dimming duty-cycle at 20 kHz
dimming frequency - LED7706,
 Less than 10 μs minimum dimming time at 1kHz
dimming frequency - LED7707
 2.0% current matching between rows
 LED failure (open and short circuit) detection

Part #

Evaluation Board

Vin

Ioutmax

Description

App Notes

LED7706

STEVALILL020V1

4.5V to 36V

20mA
per channel

LEDs Driver with Boost Converter for
LCD Panels Backlight

AN2809

LED7707

STEVALILL021V1

4.5V to 36V

60mA
per channel

LEDs Driver with Boost Converter for
LCD Panels Backlight

AN2810Energy-Efficient Solutions for
Traffic Signals on st.com
LED Lighting
Brochure

LED Application web pages

http://www.st.com/internet/com/appli_scope/392.jsp

http://www.st.com/internet/com/SALES_AND_MARKETING_R
ESOURCES/MARKETING_COMMUNICATION/MARKETING_
BROCHURE/brlighting.pdf

ST LED Lighting Solutions

For more information, visit:www.st.com > home > support > tools & resources
www.st.com > LED Drivers for Traffic Signals

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