0.5 W Non-Isolated Constant Current LED Driver

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

Focus:
A design based on the LNK302PN LinkSwitch-TN chip implements a universal-input, 12.9-V 40-mA output constant-current power supply for driving LED lamps such as night lights, neon-sign replacements, and emergency exit signs. This nonisolated buck-boost converter design requires only 9 components. The schematic shows this design powering three LED strings with four LEDs per string. Also see "1.25 W Non-Isolated Constant Current LED Driver" from same vendor.

What you’ll learn:

• How to build a universal-input, 12.9-V 40-mA output, nonisolated power supply for driving LEDs
• How to build a power supply for LED lamps used in night lights, neon-sign replacements, and emergency exit signs

Notes:
Design Idea DI-92. More details are provided in Design Example Report DER-92, which is available at http://www.powerint.com/sites/default/files/PDFFiles/der92.pdf .

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