Fairchild Semiconductor's China-based Global Power ResourceSM Center (GPRC) has developed a total solution to increase the lifetime of street lamps.
It features advanced critical conduction mode PFC, high-efficiency DC-DC and constant current contro, including 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.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.
Compared to conventional solutions, this new solution lowers component count by more than 20 for the parallel layout and 86 for the serial layout. 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.
The solution validates Fairchild's strong energy-efficiency reputation by reducing power consumption to meet and exceed the increasing demand for greener electronics. This demand has been driven by consumers as well as governments and regulatory standards worldwide, including China's central and provincial authorities and ENERGY STAR's SSL guidelines.
