2.9V～5.6V의 넓은 입력 전압 범위를 가지는웨어러블 AMOLED용 2-채널 DC-DC 변환기 설계
Design of 2-Ch DC-DC Converter with Wide-Input Voltage Range of 2.9V～5.6 V for Wearable AMOLED Display
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초록
본 논문에서는 2.9 V ～ 5.6V의 넓은 입력 전압 범위를 가지는 웨어러블 AMOLED용 2-채널 DC-DC 변환기를 설계한다. 양전압 는 과도한 입력전압이 인가된다 하더라도 정상 출력 전압을 생성되는 OPC를 내장하고, 경부하 효율을 제고하기위한 SPWM-PWM 듀얼모드 및 파워 트랜지스터 3-분할을 적용한 부스트 변환기로 설계한다. 음전압 는 전력 효율을높이기 위해 0.5x 인버팅 차지펌프를 이용해 설계한다. 제안된 DC-DC 변환기는 0.18-㎛ BCDMOS 공정으로 설계하였다. DC-DC 변환기는 2.9V～5.6V의 입력 전압에 대해 4.6V의와 -0.6V～-2.3V의 전압을 생성한다. 또한 1mA～70mA부하전류에서 49%～92%의 전력효율과 최대 20mV의 출력 리플을 가졌다.
Abstract
This paper proposes a 2-ch DC-DC converter with a wide-input voltage range from 2.9V～5.6V for wearableAMOLED displays. For positive voltage , a boost converter is designed using an over-charged voltage permissiblecircuit (OPC) which generates a normal output voltage even if over-input voltage is applied, and a SPWM-PWM dualmode with 3-segmented power transistors to improve efficiency at light load. For negative voltage , a 0.5xregulated inverting charge pump is designed to increase power efficiency. The proposed DC-DC converter was designedusing a 0.18-㎛ BCDMOS process. Simulation results show that the proposed DC-DC converter generates voltagesof 4.6 V and voltage of -0.6V～-2.3V for input voltage of 2.9V to 5.6V. In addition, it has power efficiency of 49%～92%, output ripple voltage has less than 20 mV for load current range of 1 mA～70 mA
참고문헌 (9)
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