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Reference designs simplify LED lighting applications

ON Semiconductor, a global supplier of energy efficient, silicon solutions for green electronics, has launched two new GreenPoint reference designs to 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 to 5 W LED driver solution for driving high-brightness 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. Each design addresses all of the functional blocks needed to create a complete application and is 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 ON Semiconductor’s NCP3065 switching regulator operating at around 150 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 company’s website.

ON Semiconductor’s off-line LED Driver GreenPoint reference design for ENERGY STAR residential LED luminaires has been optimized to drive between one and eight high-power LEDs in applications such as portable desk lamps, under-cabinet lighting, and outdoor porch lights. This reference design uses a novel circuit configuration to achieve a power factor of >0.85 at 115 Vac without the addition of an extra passive power factor correction network. This reduces components count and easily meets the residential power factor requirements. The design operates from a 90 to 265 Vac universal input and is built around the ON Semiconductor NCP1014 switcher IC, which integrates a fixed-frequency current mode controller with a 700 V MOSFET.

For more information, contact ON Semiconductor, 5005 East McDowell Rd., Phoenix, AZ 85008. Phone: 888-743-7826.

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