Fairchild launched 12W LED lighting reference design RD226

In order to reduce the complexity of the design high brightness LED lighting, and reduce the volume and reduce the overall system cost, a more and more common design trend is the use of universal AC input LED driving scheme. Recently, Fairchild Semiconductor (Fairchild) for LED application designers to develop a reference design RD226, it does not need the secondary control circuit and optocoupler, you can achieve AC input high brightness (HB) LED lighting system. RD226 is a general purpose input 12W LED lighting solution that can reduce the volume of HB LED lamps and save material list (BOM) costs.

The the reference design of the flyback topology of isolated primary side control offline AC-DC converter, universal input voltage range is 85VRMS to 265VRMS, the line frequency is 50Hz to 60Hz. RD226 also provides 350mA and 700mA optional constant current output, the two largest output voltage is 17V. However, the output current can be easily adjusted by changing a resistor. This reference design uses the Fairchild FAN102 device as the primary end PWM controller to reduce the overall system cost and volume.

Fairchild 12W LED lighting reference design RD226

With AC power input HB LED lighting applications need a circuit converts an AC input voltage for constant current, but in some applications, the load must be with the power supply input isolation, thus increasing the complexity of design. Traditional methods need to use flyback converter with constant current output. In most cases, the secondary side control circuit using an operational amplifier with a reference circuit, or with a special IC control to adjust current, and through an optical coupler to the primary side PWM controller to send control information. Fairchild innovative solutions that allow designers to achieve the AC input LED lighting system without secondary end control circuit and optocoupler.

Fairchild offers a wide range of reference design, can reduce board space, simplify the design, and ensure the reliability of the system and accelerate the speed to market. These production ready reference designs can play an important role in enabling OEM vendors to shorten design time and bring their applications to market faster.