Fairchild Semiconductor’s Solution for LED Street Lighting

Jul 29, 2010 Fairchild Semiconductor’s China-based Global Power Resource SM Centre (GPRC) has developed a complete LED street lighting solution.

Fairchild’s new solution features advanced critical conduction mode (CrCM) PFC, high-efficiency DC-DC and constant current control. This total solution includes two sub-solutions, either parallel or serial, within the same PCB layout delivering up to 91.26 percent and 92.6 percent efficiency respectively from AC input to the LED side, under 220V input voltage.

The parallel solution features independent current regulation for each LED string. Therefore, if one string has an open circuit the other strings can still function normally. For the serial solution, independent open circuit protection for each string enables the other LEDs to still work normally even if one LED string experiences an open circuit. If an LED short circuit happens, the constant current circuits ensure all the other LEDs work normally in both parallel and series sub-solution.

This new solution significantly lowers component count by more than 20 for the parallel layout and 86 for the serial layout compared to conventional solutions. Fairchild’s GPRC engineers deployed a range of parts from the company’s comprehensive portfolio to develop this total solution such as the FAN7930, an active power factor correction (PFC) controller designed for boost PFC applications operating in CrCM; the highly integrated Fairchild Power Switch (FPS™), the FSFR2100 offers everything necessary to build a reliable and robust resonant half-bridge converter

In addition, Fairchild’s LED lighting solutions are available for applications with output power requirements ranging from <7W up to >100W. These include:

• PFC Controllers that include both standalone and PFC/PWM combo controllers as well as Critical Conduction Mode (CrCM) and CCM technologies, designed to increase system efficiency, reduce system noise, and offer a range of protection features for medium and high power designs.
• PWM Controllers that include standalone and highly integrated solutions with MOSFETs like the Asymmetrical Half Bridge, FSFA2100, the LLC Resonant Half Bridge, FSFR2100, and the stand-alone LLC Resonant Controller, FAN7621.
• Primary-Side-Regulation (PSR) PWM controllers, such as the FSEZ1307, FSEZ1317 and the FAN103, that enable precise constant current (CC) regulation and simplified circuit design.
• And a broad portfolio of high voltage MOSFETs, rectifiers, and diodes.


Author:  BIO T&T

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