LED Flashlight with 1w Constant Current Drive
A constant current LED driver was implemented to power a 1 Watt Cree P4 XR-E providing roughly 85 Lumens @ 350 mA. The constant current SMPS was based on the LTC3490 allowing operation from an input as low as 1 Volt. The entire assembly was retro-fitted into a late 1950’s Eveready flashlight housing.
1) Schematic 2) Board 3) Assembly 4) Light Saber