Design considerations for VRM transient response based on the output impedance

Author

Yao, Kaiwei ; Xu, Ming ; Meng, Yu ; Lee, Fred C.

Author_Institution

Bradley Dept. of Electr. & Comput. Eng., State Univ., Blacksburg, VA, USA

Volume

18

Issue

6

fYear

2003

Firstpage

1270

Lastpage

1277

Abstract

This paper discusses the transient response of voltage regulator modules (VRMs) based on the small-signal models. The concept of constant resistive output impedance design for the VRM is proposed, and its limitations in applications are analyzed. The impacts of the output filter and the feedback control bandwidth show that there is an optimal design that allows the VRM to achieve fast transient response, small size and good efficiency. Simulations and experimental results prove the theoretical analysis.

Keywords

electric current control; electric impedance; feedback; power convertors; transient response; voltage control; voltage regulators; buck converter; constant resistive output impedance design; current-mode control; feedback control bandwidth; good efficiency; output filter; output impedance; small-signal models; transient response; voltage regulator modules; Capacitors; Costs; Current supplies; Equivalent circuits; Feedback control; Impedance; Microprocessors; Regulators; Transient response; Voltage;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2003.818824

Filename

1243683