1.25 W Non-Isolated Constant Current LED Driver

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

Focus:
A design based on the LNK304PN LinkSwitch-TN chip implements a universal input, 12.5-V 100-mA output constant-current power supply for driving LED lamps such as night lights, neon-sign replacements, and emergency exit signs. The schematic shows this nonisolated buck-boost converter design powering four LED strings with five LEDs per string. Also, see "0.5 W Non-Isolated Constant Current LED Driver" from same vendor.

What you’ll learn:

• How to build a universal-input, 12.5-V 100-mA output, nonisolated power supply for driving LEDs

Notes:
Design Idea DI-74

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