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Design and Implementation of High Efficiency Voltage Mode Synchronous Buck-Boost Regulator IC

Author: ChenJieSheng
Tutor: LaiXinQuan
School: Xi'an University of Electronic Science and Technology
Course: Circuits and Systems
Keywords: Voltage mode Buck-boost converter Synchronous rectification Efficiency Stability
CLC: TM46
Type: Master's thesis
Year: 2006
Downloads: 19
Quote: 0
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Abstract


Xi'an University of Electronic Science and Technology of circuit the CAD Institute for research projects \made a comprehensive and in-depth research . The paper first describes the three basic DC / DC converter topology , focusing on the analysis of the same phase of the four-switch buck-boost converter working principle and system characteristics , to explore and achieve high conversion efficiency control circuit design thinking . Then , in the reference design of a high conversion efficiency , fixed frequency voltage mode operation with phase lifting pressure type DC / DC converter chip XD8168 . XD8168 -phase four-switch buck-boost converter topology . The design used in a novel and efficient feedback control circuit, effectively overcome the problem of switching loss is too big disadvantage in the original control method , improved control of operation of the switch tube , so that the maximum conversion efficiency of up to 96% . Reasonable selection system control program at the same time , reduce the difficulty of the circuit design . Intermittent operation mode with the introduction of the chip under light load applications can maintain high efficiency . In XD8168 circuit design with a built-in synchronous rectification technology , eliminating the need for the use of an external Schottky diode and improve efficiency at the same time save PCB board area . The papers also for the XD8168 system stability issues , introduce an external compensation network design techniques , given two effective compensation program to achieve the purpose of the optimization of the system stability and transient response . Whole chip circuit based the foreign 0.5um CMOS model , Hspice simulation software to complete before emulation chip to meet the functional requirements and performance indicators , is now entering the layout stage .

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Converter
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