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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/37853

Title: Monolithic Low-EMI CMOS DC-DC Boost Converter for Portable Applications
Authors: Wan-Rone Liou
Mei-Ling Yeh
Ping-Shin Chen
Chun-Chang Tseng
Tang-Yu Huang
Shu-Chia Lin
Cheng-Yu Lin
Chih-Hsiang Sun
Contributors: 國立臺灣海洋大學:電機工程學系
Keywords: pulse frequency modulation
CMOS integrated circuits
DC-DC power convertors
PWM power convertors
circuit stability
electromagnetic interference
Date: 2013
Issue Date: 2016-05-16T07:55:33Z
Publisher: IEEE Transactions on Very Large Scale Integration (VLSI) Systems
Abstract: Abstract:this brief presents the design of a novel low-electromagnetic interference DC-DC step-up (boost) switching converter for portable applications. The converter can switch between pulsewidth modulation and pulse-frequency modulation modes for different load conditions, and uses a new ultralow-current spread spectrum frequency modulator to reduce the harmonic noise peak. The stability of the converter system with a spread spectrum frequency modulator is first analyzed in this brief. The harmonic peak reduction for the switching frequency and the second harmonic is 14 and 18 dB, respectively. A new two-stage soft-start circuit is also implemented to greatly reduce the start-up current. The start-up current of the boost converter is effectively limited below 500 mA. This brief also investigates the effects of the spread spectrum on conversion efficiency and output ripple voltage. About 93% maximum conversion efficiency can be reached for both operation modes. The chip was fabricated using a TSMC 2P4M 0.35- μm CMOS process.
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/37853
Appears in Collections:[電機工程學系] 期刊論文

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