Architecture and IC implementation of a digital VRM controller

Author

Peterchev, Angel V. ; Xiao, Jinwen ; Sanders, Seth R.

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., Univ. of California, Berkeley, CA, USA

Volume

18

Issue

1

fYear

2003

fDate

1/1/2003 12:00:00 AM

Firstpage

356

Lastpage

364

Abstract

This paper develops the architecture of a digital PWM controller for application in multiphase voltage regulation modules (VRMs). In this context, passive current sharing and VRM transient response with nonzero controller delay are analyzed. A scheme for sensing a combination of the VRM output voltage and output current with a single low-resolution window analog-to-digital converter (ADC) is proposed. The architecture and IC implementation of a digital PWM (DPWM) generation module, using a ring-oscillator-multiplexer scheme, is discussed. Experimental results from a prototype VRM and a partial controller IC implementation are presented.

Keywords

DC-DC power convertors; PWM power convertors; control system analysis; digital control; power engineering computing; power integrated circuits; transient response; voltage control; voltage regulators; IC implementation; anal og-to-digital converter; architecture; control simulation; digital VRM controller; multiphase voltage regulation modules; nonzero controller delay; passive current sharing; ring-oscillator-multiplexer scheme; transient response; Analog-digital conversion; Communication system control; Control systems; Delay; Digital control; Digital integrated circuits; Digital modulation; Pulse width modulation; Transient response; Voltage control;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2002.807099

Filename

1187454