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Fairchild Semiconductor’s China-based Global Power Resource SM Centre (GPRC) has developed an LED street-lighting solution that reduces power consumption and meets the need for greener electronics.

The demand for more environmentally friendly electronics has been driven by consumers as well as governments and regulatory standards worldwide, including China’s central and provincial authorities and Energy Star’s Solid-State Lighting (SSL) guidelines.

Fairchild’s new solution features an advanced critical conduction mode (CrCM) PFC, a 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 per cent and 92.6 per cent efficiency respectively from AC input to the LED side under 220V input voltage.

Benjamin Tan, Fairchild’s regional vice-president of sales and marketing for China and Southeast Asia, said: ‘Our China GPRC team assists customers by providing solutions that overcome the thermal management challenges normally associated with LED street lighting and by achieving high efficiency and decreasing power consumption.

‘High system efficiency depends on the performance of each section of the design.

‘Our PFC controller and LLC ICs ensure minimum power loss and deliver higher efficiency,’ he added.

The parallel solution features independent current regulation for each LED string.

If one string has an open circuit, therefore, the other strings can still function normally.

For the serial solution, independent open-circuit protection for each string enables the other LEDs to work normally even if one LED string experiences an open circuit.

If an LED short circuit happens, the constant-current circuits ensure that all the other LEDs work normally in both the parallel and series sub-solutions.

This new solution lowers component count by more than 20 for the parallel layout and 86 for the serial layout compared with conventional solutions.

Fewer components, robust protection functionality and a high LED fault tolerance capability make the solution very reliable, according to the company.

Fairchild’s GPRC engineers deployed a range of parts from the company’s 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, and the FSFR2100, an integrated Fairchild Power Switch (FPS) that offers everything necessary to build a resonant half-bridge converter.

In addition, Fairchild’s LED lighting solutions are available for applications with output power requirements ranging from less than 7W up to more than 100W.

These include: PFC controllers that include both standalone and PFC/PWM combo controllers as well as 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 integrated solutions with Mosfets such as the Asymmetrical Half Bridge (FSFA2100), the LLC Resonant Half Bridge (FSFR2100) and the standalone LLC Resonant Controller (Fan7621); primary-side-regulation (PSR) PWM controllers, such as the FSEZ1307, the FSEZ1317 and the Fan103, which enable precise constant-current regulation and a simplified circuit design; and a range of high-voltage Mosfets, rectifiers and diodes.

Fairchild Semiconductor

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