130W LED电源设计资料.pdf

AN3105 Application note 48 V - 130 W high efficiency converter with PFC for LED street lighting applications - European version 1 Introduction Nowadays, LEDs are becoming ever more popular, thanks to their particular characteristics, such as high efficiency and long life, and therefore they are pushing the innovation of current lamp types and strongly contributing to reducing the energy consumption for internal or external lighting. This is also the case in street lighting applications, where higher efficiency and long life are vital for reducing costs. For these reasons a street lighting power supply designed to power an LED lamp must have high efficiency and at least a similar lifetime, in order to guarantee the maintenance free operation required by these kinds of applications. This application note describes the characteristics and features of a 130 W demonstration board (EVL130W-SL-EU), tailored on an LED power supply specification for street lighting. The circuit is composed of two stages; a front-end PFC using the L6562AT and an LLC resonant converter based on the L6599AT. The peculiarities of this design are; very high efficiency, extended European input mains range (177-277 VAC) operation, and long term reliability. Because reliability (MTBF - “Mean Time Between Failures”) in power supplies is typically affected by electrolytic capacitors and their typical high failure rate, unless using very expensive types, this board offers a very innovative design approach a