A cheap, current-regulated Luxeon Star driver design

Alert reader cpemma provided this link to an outstanding tech brief at OnSemi which shows some variations on this theme for those of you wanting to build series-parallel arrays of Luxeons (or other high-current LEDs). The circuit on page two adds a few transistors and resistors but protects your array from overcurrent in the case where one of your parallel strings fails. First class circuit, and well-spotted, cpemma.


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