LEDLIGHTING

LED Street Lighting

As the next generation of lighting source, high power LEDs have a number of advantages such as power saving, efficiency and cold start. They are environment friendly and have a long life which reduces the cost of maintenance. It is reported in research that an LED lamp of 100W or so can reach the lighting intensity of a 250W high voltage sodium lamp, presenting significant power efficiency. LEDs require low voltage DC supply, and therefore AC/DC conversion is necessary if they are powered by AC mains. The power supply for LEDs should meet the following requirements:

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  1. PF>0.9;
  2. Power Efficiency > 85%;
  3. Compliant with Energy Regulations;
  4. Constant Current Output;
  5. High Reliability;
  6. Surge Protection;
  7. Low Ripple;
  8. Operation Temperature -40℃ - +70℃

The requirements list above indicates that a typical LED street lighting solution have the following modules - bridge-diode, PFC, isolated DC-DC converter, LED constant current controller,and LED fixture which includes LED, Lens & heat sink. Depending on the output power, PFC may operate in either Discontinuous Conduction (DCM),Continuous Conduction (CCM) or Critical Conduction (DRM) mode. Generally, PFC has a stable 400Vdc output to feed the isolated DC-DC converter when the input is within the range from 90V to 264V. The Isolated DC-DC converter can be either fly-back or LLC type. For the LED lamps higher than 100W, the design theory of using CCM PFC or CRM PFC and LLC isolated conversion is commonly adopted. LED constant current control can be implemented by buck, boost or buck-boost topology.

The environment in which LED street lamps will be operating should obviously be taken into consideration to ensure that adequate protection is provided.

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Hover over the diagram blocks to view recommended products for this solution:

Half-bridge Resonant Controller

NCP139
NCP139
ON SEMICONDUCTOR
TPS92020D
TPS92020D
TEXAS INSTRUMENTS
Click for full parts list

High Power LEDs Such as 1W,3W LEDs

XM-L
XM-L
CREE
XP-G
XP-G
CREE
Rebel
Rebel
Luxeon
Click for full parts list

Constant Current Controller for Driving High Power LEDs

LT3743EFE#PBF
LT3743EFE#PBF
LINEAR TECHNOLOGY
LM3464MH/NOPB
LM3464MH/NOPB
NATIONAL
SEMICONDUCTOR
Click for full parts list

PWM Controller for Flyback Circuit

NCP1230D100R2G
NCP1230D100R2G
ON SEMICONDUCTOR
TPS92210D
TPS92210D
TEXAS INSTRUMENTS
FAN7527
FAN7527
FAIRCHILD
MCP163
MCP163
Microchip
Click for full parts list

PFC Controller for Power Factor Correction Circuit

MC33262
MC33262x
ON SEMICONDUCTOR
UCC2881x
UCC2881x
TEXAS INSTRUMENTS
ML4824
ML4824x
FAIRCHILD
GS dsPIC
GS dsPIC
Microchip
Click for full parts list

High Voltage MosFET
Click for full parts list

Rectifier Bridge
Click for full parts list

LED Light Engine

LED Optic Arrays

LED Optic Arrays

Wire to Board Connectors

SSL Interconnect

SSL Interconnect

AC164133  - Buck/Boost Converter PICtail PlusAC164133  - 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.
LED Lighting Development KitDM330014 - 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 BoardMCP1630 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 BoardMCP1650 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.
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