•  
• EDN Europe MAGAZINE
•  
• Free SUBSCRIPTION
• Subscription Renewal
• View Media Kit

• EDN
• EDN Australia
• EDN Asia
• EDN China
• EDN Japan

High brightness LED lighting reference design

Fairchild Semiconductor has unveiled a reference design that enables designers to implement an AC-input LED lighting system without a secondary-side control circuit and optocoupler. The RD226 is a 12W LED lighting solution that reduces the size of the HB LED lamp and BOM (bill of materials) cost. The reference design features an isolated, primary-side regulated off-line AC/DC converter in flyback topology. It offers a universal input voltage range of 85 to 265VRMS at a line frequency range of 50 to 60Hz. It has one constant current output that is selectable between 350 and 700mA, both at a maximum output voltage of 17V. This reference design features the company’s FAN102 device that is used as a primary-side-control PWM controller, thereby reducing the overall system cost and size. The PWM controller features CV (constant voltage) and CC (constant current) control without secondary-feedback circuitry.