ON Semiconductor (distributed in Australia by Avnet) released two GreenPoint reference designs that will speed and simplify the development of high-efficiency LED-based lighting applications.

Configured in size and features for MR16 LED replacements, the first reference design describes a built and tested 3 W to 5 W LED driver solution for driving high-brightness LEDs (HB-LEDs). The second design is targeted at designers looking to achieve compliance with the ENERGY STAR 1.1 requirements for Solid State Lighting (SSL) in residential luminaire applications and describes a built and tested off-line GreenPoint solution for an isolated 8 W constant current LED driver.

The designs address the functional blocks needed to create a complete application and are available as a package that includes description, schematics, bill-of-materials (BoM), Gerber files and evaluation guidelines.

The MR16 reference design is based on a buck-boost topology using the company's NCP3065 switching regulator operating at around 150 kilohertz (kHz) in a non-isolated constant current configuration. Suitable for 12 Vac or 12 Vdc applications such as track lighting, automotive lighting and landscape lighting, the circuit delivers flat current regulation irrespective of input line and output LED voltage variation. It also features a unique auto-detect circuit that allows input from a 12 Vdc or 12 Vac supply while maintaining the targeted output current. A reference design evaluation board is available on the ON Semiconductor website.