정전류 제어를 위한 LED 파워 드라이버 회로

This paper presents an LED power driver which uses a boost converter to solve an LED current mismatching problem in parallel-connected LED strings. This LED power driver also resolves the limitation in the number of series-connected LED string. In addition, the proposed LED power driver reduced an unnecessary passive resistor by using the common base resistor in the transistors of the LED driver. The presented LED driver could provide a constant current for each LED in spite of the collector-emitter voltage of transistors.