Fig. 1.
Typical structure of a peak current-mode DC–DC buck converter.
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| Citation: |
Jie Li, Miao Yang, Weifeng Sun, Xiaoxia Lu, Shen Xu, Shengli Lu. A fast novel soft-start circuit for peak current-mode DC-DC buck converters[J]. Journal of Semiconductors, 2013, 34(2): 025006. doi: 10.1088/1674-4926/34/2/025006
J Li, M Yang, W F Sun, X X Lu, S Xu, S L Lu. A fast novel soft-start circuit for peak current-mode DC-DC buck converters[J]. J. Semicond., 2013, 34(2): 025006. doi: 10.1088/1674-4926/34/2/025006.
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A fast novel soft-start circuit for peak current-mode DC-DC buck converters
doi: 10.1088/1674-4926/34/2/025006
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Abstract
A fully integrated soft-start circuit for DC-DC buck converters is presented. The proposed high speed soft-start circuit is made of two sections:an overshoot suppression circuit and an inrush current suppression circuit. The overshoot suppression circuit is presented to control the input of the error amplifier to make output voltage limit increase in steps without using an external capacitor. A variable clock signal is adopted in the inrush current suppression circuit to increase the duty cycle of the system and suppress the inrush current. The DC-DC converter with the proposed soft-start circuit has been fabricated with a standard 0.13 μm CMOS process. Experimental results show that the proposed high speed soft-start circuit has achieved less than 50 μs start-up time. The inductor current and the output voltage increase smoothly over the whole load range.-
Keywords:
- current-mode,
- DC-DC converter,
- soft-start,
- inrush current,
- overshoot voltage
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References
[1] Lai Xinquan, Jia Ligang, Hu Juncai, et al. The design of a low voltage and high speed driver circuit for boost DC-DC converter. 5th International Conference on ASIC Proceeding, 2003, 1(10):635 http://vanner.com/manuals/HIGH-VOLTAGE-DC-DC-CONVERTER.pdf[2] Lai Xinquan, Guo Jianping, Yu Weixue. A novel digital soft-start circuit for DC-DC switching regulator. 6th International Conference on ASIC Proceeding, 2005, 2(10):564 http://ieeexplore.ieee.org/document/1611391/[3] Yuan Bing, Lai Xinquan, Ye Qiang, et al. A novel compact soft-start circuit with internal circuitry for DC-DC converter. 7th International Conference on ASIC Proceeding, 2007:450 http://yadda.icm.edu.pl/yadda/element/bwmeta1.element.ieee-000004415664[4] Chen K H, Chang C T, Liu T H. Bidirectional current-mode capacitor multipliers for on-chip compensation. IEEE Trans Power Electron, 2008, 23(1):180 doi: 10.1109/TPEL.2007.911776[5] Wang Y, Xu D, Guo D, et al. The new soft starting methods for electronics ballasts of UV lamps based on microcontroller. IEEE Conference on Industrial Electronics and Applications, 2006:1[6] Ryu Y C, Hwang Y W. A new soft-start method with abnormal over current protection function for switching power supplies. IEEE International Conference on Electric Machines and Drives, 2005:431 doi: 10.1007%2F1-4020-7830-7_24[7] Li Sizhen, Zou Xuecheng, Chen Xiaofei. Designing a compact soft-start scheme for voltage-mode DC-DC switching converter. Microelectron J, 2010, 41(7):430 doi: 10.1016/j.mejo.2010.05.001[8] Lee K C, Chae C S, Cho G H, et al. A PLL-based high-stability single-inductor 6-channel output DC-DC buck converter. IEEE International ISSCC, 2010:200[9] Barrado A, Quintero J, Lazaro A, et al. Linear-non-linear control applied in multiphase VRM. IEEE Power Electronics Specialists Conference, 2005:904[10] Shibata K, Pham C K. A DC-DC converter using a high speed soft-start control circuit. IEEE International Symposium on Circuits and Systems, 2010:833 http://scm.nsfc.gov.cn/indexhtml/pub_maint_en_US.html -
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