Fairchild
Semiconductor's China-based Global Power Resource Center (GPRC) has developed a
complete LED street lighting solution that provides high efficiency and
outstanding thermal performance -- as well as high reliability -- to increase
the lifetime of street lamps.
The
performance-optimized solution validates Fairchild's strong energy-efficiency
reputation by reducing power consumption in order 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 Solid-State
Lighting (SSL) guidelines.
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.
"Our
China GPRC team assists customers by providing solutions that overcome thermal
management challenges normally associated with LED street lighting, and by
achieving high efficiency and decreasing power consumption," said Benjamin
Tan, Fairchild's regional vice president of Sales and Marketing, China and
South East Asia. "High system efficiency depends on the performance of
each section of the design. Our leading edge PFC controller and LLC ICs ensure
minimum power loss and deliver higher efficiency."
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. Fewer
components, robust protection functionality and high LED fault tolerance
capability make the solution very reliable.
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.
Fairchild's
Global Power Resource Centers are a valuable resource for system design
engineers, enabling them to quickly differentiate their designs and shorten
time-to-market.
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