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AN3106 Datasheet(PDF) 1 Page - STMicroelectronics |
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AN3106 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 34 page  September 2012 Doc ID 16775 Rev 2 1/34 AN3106 Application note 48 V - 130 W high-efficiency converter with PFC for LED street lighting applications By Claudio Spini Introduction The use and growing popularity of LEDS, thanks to their high efficiency and very long lifetime, are driving the innovation of different types of lamps and contributing to the reduction of energy consumption for internal and external lighting. Streetlight applications require that the power supply designed to power an LED lamp must have high efficiency and at least an equivalent lifetime in order to guarantee maintenance-free operation during the life of the LED. This application note describes the characteristics and features of a 130 W demonstration board (EVL130W-STRLIG), tailored to 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 strengths of this design are very high efficiency, wide input mains range (85-305 VAC) operation and long-term reliability. Because reliability (MTBF - “mean time between failures”) in power supplies is typically affected by the high failure rate of electrolytic capacitors unless using very expensive types, this board shows a very innovative design approach. The board doesn't implement any electrolytic capacitors, but uses instead film capacitors from EPCOS. Component de-rating has been also carefully applied during the design phase, decreasing the stress of the components as recommended by the MIL-HDBK-217D. The number of components, thanks to the use of the new devices L6562AT and L6599AT has also been minimized, thus increasing the MTBF and optimizing the total component cost. Thanks to the high efficiency achieved, just a small heatsink for the PFC stage is needed, while the other power components are SMT (surface mount technology) like most of the passive components, thus decreasing the production labor cost. The board also has protection features in case of overload, short-circuit, open loop by each stage or input overvoltage. For this particular application, all protections in case of intervention have an auto-restart functionality. Figure 1. EVL130W-STRLIG: 130 W SMPS for LED street lighting applications www.st.com |
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