LEDLIGHTING
LED Traffic Lights
LEDs have already replaced traditional incandescent lamps in traffic signal applications for their high efficiency, low power consumption and long life. LED Traffic Signals use both high brightness & high power LEDs connected in a combination of series and parallel to build a LED cluster. To realize specific luminous distribution intensity, an additional optical design (lenses) is necessary. If traffic signals are driven by AC power, an AC-DC circuit is required to convert AC to DC power that is suited for LED driver to drive LED cluster/string. MCU is used to implement the control over LED driver so as to give correct traffic signals.
Usually LED traffic signals are equipped with RS-485 port or wireless module (GPRS module) which is controlled by MCU to communicate with control center in a large area. In addition, as the green energy technology continues to evolve, some LED traffic signals are capable of utilizing solar energy as their power source by integrating solar panel and battery in power systems to capture and store the solar energy.
Hover over the diagram blocks to view recommended products for this solution:
Providing PWM signal
ON SEMICONDUCTOR
FAIRCHILD
Microchip
Managing the LED drivers and communicate with control center.
ATMEL
from Microchip
Microchip
Drive the LED arrays with constant current
LINEAR TECHNOLOGY
High brightness/high power LED arrays with red, yellow and green colors.
Osram
P4 series
SEOUL SEMICONDUCTOR
GSM/GPRS Module
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Bridge Rectifier
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Transformer
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MOSFET
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 | AC164133 - Buck/Boost Converter PICtail Plus Microchip The Buck/Boost Converter PICtail™ Plus Daughter Board provides an easy and economical way to evaluate Switch Mode Power Supply applications with the dsPIC33F GS Digital Power Conversion family. | |
 | DM330014 - LED Lighting Development Kit Microchip Microchip's Digital LED Lighting Development Kit enables designers to quickly leverage the capabilities and performances of the dsPIC33F GS series of Digital Signal Controllers (DSCs) to develop LED-lighting products. | |
 | MCP1630 Boost Mode LED Driver Demo Board Microchip The MCP1630 Boost Mode LED Driver Demo Board is a step-up, switch-mode, DC-DC converter used for power LED applications. | |
 | MCP1650 3W White LED Demo Board Microchip The MCP1650 3W White LED Demo Board demonstrates Microchip’s MCP165X Boost Controller product family in a battery powered white LED application. | |
 | MCP1650 Multiple White LED Demo Board Microchip The MCP1650 Multiple White LED Demo Board uses the MCP1650 IC to power the nine white LEDs which are connected in series. | |
| Image | Description |
|---|
| Microchip | MCU | Buck Boost LED Driver using PIC16F785 | AN1047 Apps Note | PIC16F785 | Click here |
| Microchip | LED Drivers | Dimming Power LEDs Using a SEPIC Converter and MCP1631 | AN1261 Apps Note | Click here | |
| Microchip | PWM | Dimming Power LEDs Using a SEPIC Converter and MCP1631 | AN1261 Apps Note | Click here | |
| Microchip | MCU | Offline Power Converter for High-Brightness LEDs Using the PIC16HV785 Microcontroller | AN1271 Apps Note | Click here | |
| Microchip | MCU | nanoWatt & nanoWatt XLP(TM) Technologies: An Introduction to Microchip's Low Power devices | AN1267 Apps Note | Click here | |
| Microchip | MCU | High Power LED Flashlight Demonstration – Advanced Control and Increased Efficacy | Schematics | Click here | |
| LINEAR TECHNOLOGY | LED Driver | LT3592: Step-Down 500mA LED Driver with 10:1 Dimming | DC1205A | LT3592 | Click here |
| LINEAR TECHNOLOGY | LED Driver | Step-Down 1A LED Driver Demo Circuit | DC1309 | LT3474 | Click here |
| LINEAR TECHNOLOGY | LED Driver | High Voltage Buck Converters Drive High Power LEDs | DN392 | LT3474/3475 | Click here |
| LINEAR TECHNOLOGY | LED Driver | LT3518: Full-Featured LED Driver with 2.3A Switch Current | DC1160 | LT3518 | Click here |
| ON SEMICONDUCTOR | LED Driver | 9V-36V Vin DC, Constant Current LED Driver | DN06001/D | NCP3063 | Click here |
| ON SEMICONDUCTOR | LED Driver | High Intensity LED Drivers Using NCP3065/NCV3065 | AND8298/D | NCP3065 | Click here |
| ON SEMICONDUCTOR | PWM Controller | Tips and Tricks to Build Efficient Circuits with NCP1200 | AND8069 | NCP1200 | Click here |
| ON SEMICONDUCTOR | PWM Controller | Implementing the NCP1200 in Low-Cost AD/DC converters | AND8023/D | NCP1200 | Click here |
| MICROCHIP | LED Driver | Switch Mode Power Supply (SMPS) Topologies (Part I) | AN1114 | dsPIC33F | Click here |
| MICROCHIP | LED Driver | Switch Mode Power Supply (SMPS) Toplogies (Part II) | AN1207 | dsPIC33F | Click here |
| Manufacturer | Product Type | AN Title | AN Number | Part Number | URL |
|---|
| MICROCHIP | LED Driver | Buck/Boost Converter PICtail Plus Daughter Board | AC164133 | dsPIC33FGS | Click here |
| Manufacturer | Product Type | Evaluation Kits Title | EVKs Part Number | Part Number | URL |
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| MICROCHIP | LED Driver | Introducing the dsPIC33F GS series devices | dsPIC33FGS | Click here |
| Cree | HP LED | XLamp® Color LEDs | Click here | |
| Manufacturer | Product Type | Training Title | Part Number | URL |
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