J. Semicond. > Volume 32 > Issue 11 > Article Number: 115007

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

Zhen Shaowei , Zhang Bo , Luo Ping , Hou Sijian , Ye Jingxin and Ma Xiao

+ Author Affiliations + Find other works by these authors

PDF

Abstract: 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 mm2. 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.

Key words: digital power

[1]
[2]
[3]
[4]
[5]
[6]
[7]

Search

Advanced Search >>

GET CITATION

Zhen S W, Zhang B, Luo P, Hou S J, Ye J X, Ma X. A digitally controlled PWM/PSM dual-mode DC/DC converter[J]. J. Semicond., 2011, 32(11): 115007. doi: 10.1088/1674-4926/32/11/115007.

Export: BibTex EndNote

Article Metrics

Article views: 2389 Times PDF downloads: 4485 Times Cited by: 0 Times

History

Manuscript received: 20 August 2015 Manuscript revised: 18 July 2011 Online: Published: 01 November 2011

Email This Article

User name:
Email:*请输入正确邮箱
Code:*验证码错误