12 W Non-Isolated, Buck Topology, Power Factor Corrected, LED Driver Using LinkSwitch-PH
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This document describes a non-isolated, high power-factor, TRIAC dimmable LED driver designed to drive 36 V at 0.33 A from an input voltage range of 90 to 265 VAC. The LED driver utilizes Power Integrations' LNK405EG device. LinkSwitch-PH was used to cost effectively design a single-stage, power factor corrected LED driver with primary-side constant current control. The LinkSwitch-PH controller was optimized for LED driver applications with minimal external components and control of the output current through the LED load without the use of an optocoupler. The non-isolated power factor corrected buck presented in this report shows how LinkSwitch-PH dramatically simplifies off-line, high-efficiency, power factor corrected LED driver design.