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A Time-Domain-Controlled Current-Mode Buck Converter With Wide Output Voltage Range

Title
A Time-Domain-Controlled Current-Mode Buck Converter With Wide Output Voltage Range
Author
유창식
Keywords
Buck converter; CMOS; current-mode control; dc-dc converter; sub-harmonic oscillation; time-domain control
Issue Date
2019-03
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation
IEEE JOURNAL OF SOLID-STATE CIRCUITS, v. 54, NO 3, Page. 865-873
Abstract
The controller of a current-mode buck converter is realized by only time-domain circuits such as voltage-controlled oscillator (VCO), voltage-controlled delay line (VCDL), and phase detector (PD). The inductor current is sensed by a VCO, which helps improving power efficiency and eliminates the need for the slope compensation preventing the sub-harmonic oscillation. The type-II frequency compensation network is realized by a combination of VCO and VCDL without an error amplifier (EA) and RC network which may consume large power and occupy large silicon area. Instead of voltage comparator, a PD detects the error of the output voltage, which allows the switching duty cycle and thus the output voltage to be controlled in a wide range. With the proposed time-domain current-mode controller, a buck converter has been implemented in a 65-nm CMOS process. The output voltage can be regulated from 0.15 to 1.69 V from a 1.8-V input and the maximum load current is 0.6 A. The peak power efficiency is 94.9% when the output is 1.5 V and the load current is 250 mA. The load transient speed is better than 3.5 mu s for both the step-up and step-down changes of the load current by 480 mA in 0.1 mu s.
URI
https://ieeexplore.ieee.org/document/8584411https://repository.hanyang.ac.kr/handle/20.500.11754/110265
ISSN
0018-9200; 1558-173X
DOI
10.1109/JSSC.2018.2884912
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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