Paper Info
Title
A 10-MHz Hysteretic-Controlled Buck Converter With Single On/Off Reference Tracking Using Turning-Point Prediction for DVFS Application
Abstract
This paper presents a turning-point output voltage (TPOV) prediction method to enhance the reference tracking speed of buck converters for dynamic voltage and frequency scaling (DVFS) application. The optimal reference tracking is modeled, and the TPOV is formulated. The parasitic effects are compensated with the proposed calibration scheme. Reference tracking considering load current changes is evaluated with the proposed end-point determination method. Additionally, this work optimizes the feedback network for smooth loop transition, and incorporates the frequency-locking circuit and the error correction path to address the shortcomings of the hysteretic control. The prototype is fabricated in a 0.13- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu \text{m}$ </tex-math></inline-formula> CMOS process with a 1.2-V supply voltage. The converter achieves a near-optimum reference tracking over a wide range of output voltages, from 0.5 to 1 V. Various output voltage steps are measured for different load cases. For a 0.5–1-V output voltage step, with a 90-nH inductor and a 1- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu \text{F}$ </tex-math></inline-formula> output capacitor, the up- and down-tracking take 558 and 542 ns, respectively, matching the theoretical result of 533 ns. The prototype achieves a peak efficiency of 93.5%, and over 85% efficiency is measured with <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mathrm {V}_{\mathrm {O}}$ </tex-math></inline-formula> from 0.5 to 1 V and <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mathrm {I}_{\mathrm {O}}$ </tex-math></inline-formula> from 130 to 550 mA.
Year
DOI
Venue
2019
10.1109/tcsi.2019.2916611
IEEE Transactions on Circuits and Systems I-regular Papers
Keywords
Field
DocType
Inductors,Buck converters,Capacitors,Program processors,Switches,Load modeling,Voltage measurement
Capacitor,Control theory,Voltage,Hysteresis,Inductor,Error detection and correction,Frequency scaling,Buck converter,Mathematics,Calibration
Journal
Volume
Issue
ISSN
66
11
1549-8328
Citations 
PageRank 
References 
4
0.43
0
Authors
2
Name
Order
Citations
PageRank
Sijie Pan140.43
Philip K. T. Mok2718171.27