DIGITAL SMPS APPARATUS FOR SUPPLYING LED USING MIRROR CIRCUIT

摘要

PURPOSE: A digital switch mode power supply device for LED power supply using a mirror circuit is provided to minimize the reduction of life span due to a passive device by serially connecting LEDs. CONSTITUTION: A power supply unit(10) comprises a bridge rectifier circuit which comprises a fuse connected to one side of AC power terminals, fourth and fifth capacitors and an output terminal connected to an LED unit(30), and a reference terminal is parallelly connected to a reference voltage and current control unit(21) of a power supply control unit(20). The power supply control unit comprises a power supply voltage control IC, fifth to eleventh resistances, and a second capacitor.