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This research investigated a method to optimize the start-up performance of a dimmable light-emitting diode (LED) driver based on half-bridge Class D series–parallel LCC topology. This LED driver is designed for outdoor or high bay applications with 347–480 $V_{{\rm ac}}$ input voltage. The total maximum output power is 100 W with a wide tunable output current range (from 50 to 800 mA). The wide...