A digitally controlled PWM/PSM dual-mode DC/DC converter

A digitally controlled pulse width modulation/pulse skip modulation （PWM/PSM） dual-mode buck DC/DC converter is proposed. Its operation mode can be automatically chosen as continuous conduction mode （CCM） or discontinuous conduction mode （DCM）. The converter works in PSM at DCM and in 2 MHz PWM at C...

Full description

Saved in:
Bibliographic Details
Published inJournal of semiconductors Vol. 32; no. 11; pp. 103 - 109
Main Author 甄少伟 张波 罗萍 侯思剑 叶璟欣 马骁
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.11.2011
Subjects
Chips
Compensators
Conversion
Converters
DCM
Direct current
DPWM
PSM
Pulse duration modulation
Semiconductors
Switching
双模式
数字控制
模式转换器
脉冲宽度调制器
连续导电模式
Online AccessGet full text
ISSN1674-4926
DOI10.1088/1674-4926/32/11/115007

Cover

More Information
Summary:A digitally controlled pulse width modulation/pulse skip modulation （PWM/PSM） dual-mode buck DC/DC converter is proposed. Its operation mode can be automatically chosen as continuous conduction mode （CCM） or discontinuous conduction mode （DCM）. The converter works in PSM at DCM and in 2 MHz PWM at CCM. Switching loss is reduced at a light load by skipping cycles. Thus high conversion efficiency is realized in a wide load current. The implementations of PWM control blocks, such as the ADC, the digital pulse width modulator （DPWM） and the loop compensator, and PSM control blocks are described in detail. The parameters of the loop compensator can be programmed for different external component values and switching frequencies, which is much more flexible than its analog rivals. The chip is manufactured in 0.13 μm CMOS technology and the chip area is 1.21 mm^2. Experimental results show that the conversion efficiency is high, being 90% at 200 mA and 67% at 20 mA. Meanwhile, the measured load step response shows that the proposed dual-mode converter has good stability.
Bibliography:A digitally controlled pulse width modulation/pulse skip modulation （PWM/PSM） dual-mode buck DC/DC converter is proposed. Its operation mode can be automatically chosen as continuous conduction mode （CCM） or discontinuous conduction mode （DCM）. The converter works in PSM at DCM and in 2 MHz PWM at CCM. Switching loss is reduced at a light load by skipping cycles. Thus high conversion efficiency is realized in a wide load current. The implementations of PWM control blocks, such as the ADC, the digital pulse width modulator （DPWM） and the loop compensator, and PSM control blocks are described in detail. The parameters of the loop compensator can be programmed for different external component values and switching frequencies, which is much more flexible than its analog rivals. The chip is manufactured in 0.13 μm CMOS technology and the chip area is 1.21 mm^2. Experimental results show that the conversion efficiency is high, being 90% at 200 mA and 67% at 20 mA. Meanwhile, the measured load step response shows that the proposed dual-mode converter has good stability.
Zhen Shaowei, Zhang Bo, Luo Ping, Hou Sijian, Ye Jingxin, Ma Xiao State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
11-5781/TN
digital power; PSM; ADC; digital proportion integration differentiation; DPWM; buck
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1674-4926
DOI:10.1088/1674-4926/32/11/115007