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Switch Design of TM Type SIDO DC-DC Buck Converter for Camera Module  

Choi, Hun (Chonbuk National University)
Lee, Dong-Keon (Chonbuk National University)
Jeong, Hang-Geun (Chonbuk National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SC / v.49, no.1, 2012 , pp. 57-63 More about this Journal
Abstract
In this paper, a switch sizing method is proposed in order to prevent the cross-regulation in the TM type SIDO DC-DC buck converter. In TM type SIDO DC-DC buck converter, a DCM operation is required. In the DCM operation, the inductor peak current is larger than that in the CCM. Because of the larger inductor peak current and the added switch resistance, the voltage drop is increased, resulting in possible cross-regulation. To solve this problem, the switch resistance must be considered in sizing the switch. To simplify the calculation of the resistance, the inductor current was replaced by the average load current. Using the proposed method, TM type SIDO DC-DC buck converter for camera module was designed to provide two independent supply voltage(2.8 V and 1.8 V). The designed circuit was fabricated in a standard $0.35{\mu}m$ CMOS process. At a switching frequency of 1 MHz and a load current of 200 mA, a power effciency of 80.7% was achieved.
Keywords
DC-DC converter; SIDO; TM; DCM; cross-regulation;
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1 장덕규, "SMPS의 기본원리와 SMPS의 시험", 전자공학회 논문지, 제18권, 제5호(통권 제84호), 313-320쪽, 1991년5월
2 Dongsheng Ma, Wing-Hung Ki, Chi-Ying Tsui and Philip K. T. Mok, "Single-inductor multiple-output switching converters with time-multiplexing control in discontinuous conduction mode", IEEE J. Solid State Circuits, vol. 38, no. 1, Jan. 2003.
3 Dongsheng Ma, Wing-Hung Ki and Chi-Ying Tsui, "A pseudo-CCM/DCM SIMO switching converter with freewheel switching", IEEE J. Solid-State Circuits, vol. 38, no. 6, June 2003.
4 Volkan Kursun and Eby G. Friedman, Multi-voltage CMOS circuit design, John Wiley&Sons, 2006.
5 Robert W. Erickson and Dragan Maksimovic, Fundamentals of power electronics, 2nd Edition, Kluwer Academic, 2001.
6 김희준, 스위치모드 파워서플라이, 성안당, 2005.