High Efficiency, Low Cost, Non-Isolated 350 mA, 12 V LED Driver

by no author specified, Power Integrations, Vendor website, Sep 01 2008

Focus:
A circuit design based on the LNK605DG LinkSwitch-II chip is presented for a universal input, 12-Vdc 350-mA output, CV/CC power supply for LED driver applications. This nonisolated design uses a tapped buck topology, which enables a smaller PCB, smaller inductor core, higher efficiency, and better EMI performance than a comparable isolated flyback converter.

What you’ll learn:

• How to build a 4.2-W, universal input nonisolated power supply for driving three high-power LEDs

Notes:
Design Idea DI-186. Design meets Energy Star requirements for solid state lighting (SSL) luminaries. A more detailed reference design is presented in Design Example Report DER-186 available at http://www.powerint.com/sites/default/files/PDFFiles/der186.pdf .

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