On-chip compensated error amplifier for voltage-mode buck converters

Author

Zhen, Shaowei ; Zhang, Bo ; Luo, Ping ; Chen, Lun ; Wu, Huiming

Author_Institution

State key Lab. of Electron. Thin Films & Integrated Devices, Univ. of Electron. Sci. & Technol. of China, Chengdu, China

fYear

2010

fDate

28-30 July 2010

Firstpage

565

Lastpage

568

Abstract

An on-chip compensated error amplifier in a voltage-mode buck converter is proposed in the paper. The compensated error amplifier is composed of two blocks, unit gain zero generation block and gain block, realizing phase shift and gain of the feedback loop, respectively. Compared to conventional type III compensated error amplifier in voltage-mode buck converter, the proposed circuit has much smaller passive component values, enabling full integration of the voltage mode buck converter in SoC. The converter is designed in 0.13 μm CMOS process, operating typically at 1.5 MHz pulse width modulation (PWM). The simulation results show the converter with on-chip compensated error amplifier achieves both 0.3% load regulation and 10 μs load step response time for load step between 200 mA and 700 mA.

Keywords

CMOS integrated circuits; PWM power convertors; feedback amplifiers; system-on-chip; CMOS process; SoC; current 200 mA to 700 mA; feedback loop; gain block; on chip compensated error amplifier; passive component; phase shift; pulse width modulation; size 0.13 mum; time 10 mus; unit gain zero generation block; voltage mode buck converters;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, Circuits and Systems (ICCCAS), 2010 International Conference on

Conference_Location

Chengdu

Print_ISBN

978-1-4244-8224-5

Type

conf

DOI

10.1109/ICCCAS.2010.5581933

Filename

5581933