Led Street Light is kind of normal light for public outdoor lighting, include LED lamp and Light Pole, mostly installed in the place without strong sunlight, electric cable needed,controll by the city lighting system center. widely applied in lighting highway; roads; bridges; pedestrian streets and other occasions where good lighting effect is required. Led Street Light,Led Street Lamp,Led Street Lights,Outdoor Street Lamp Yangzhou Urban New Energy Co.,Ltd , http://www.urban-solarenergy.com
High-brightness (HB) LED applications with AC power supply | regulator inputs require a circuit to convert the AC input voltage to a constant current, and in some applications, the design complexity is added because the load must be isolated from the power supply input. . Traditional methods require the use of a flyback converter with a constant current output. In most cases, the secondary side control circuit uses an op amp in conjunction with a reference circuit, or uses only one dedicated control IC to regulate the current and sends control information to the primary side of the PWM controller via the optocoupler. Fairchild's innovative solutions enable designers to implement AC input LED lighting systems that do not require secondary side control circuitry and optocouplers. 
On June 10th, Fairchild Semiconductor brought LED design designers a reference design, the RD226, to implement an AC-input LED lighting system without the need for a secondary-side control circuit and optocoupler. The RD226 is a universal input 12W LED lighting solution that reduces the size of high-brightness (HB) LEDs and saves bill of materials (BOM) costs. This reference design features an isolated primary-side control off-line AC-DC converter with a flyback topology with a universal input voltage range of 85VRMS to 265VRMS and a line frequency of 50Hz to 60Hz. The RD226 also offers an optional constant current output of 350mA and 700mA, both with a maximum output voltage of 17V. This reference design uses Fairchild's FAN102 device as the primary-side control PWM controller to reduce overall system cost and size.
March 16, 2019