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http://dx.doi.org/10.7471/ikeee.2020.24.3.859

Design of 2-Ch DC-DC Converter with Wide-Input Voltage Range of 2.9V~5.6 V for Wearable AMOLED Display  

Lee, Hui-Jin (School of Electrical and Computer Engineering, Chungbuk National University)
Kim, Hak-Yun (Zinitix Co.)
Choi, Ho-Yong (School of Electrical and Computer Engineering, Chungbuk National University)
Publication Information
Journal of IKEEE / v.24, no.3, 2020 , pp. 859-866 More about this Journal
Abstract
This paper proposes a 2-ch DC-DC converter with a wide-input voltage range from 2.9V~5.6V for wearable AMOLED displays. For positive voltage VPOS, a boost converter is designed using an over-charged voltage permissible circuit (OPC) which generates a normal output voltage even if over-input voltage is applied, and a SPWM-PWM dual mode with 3-segmented power transistors to improve efficiency at light load. For negative voltage VNEG, a 0.5x regulated inverting charge pump is designed to increase power efficiency. The proposed DC-DC converter was designed using a 0.18-㎛ BCDMOS process. Simulation results show that the proposed DC-DC converter generates VPOS voltages of 4.6 V and VNEG 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.
Keywords
OPC; SPWM; DC-DC converter; AMOLED; wide input voltage;
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Times Cited By KSCI : 4  (Citation Analysis)
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