NDLI: A Fast Fixed-Frequency Adaptive-On-Time Boost Converter With Light Load Efficiency Enhancement and Predictable Noise Spectrum

Content Provider	IEEE Xplore Digital Library
Author	Xiaocheng Jing Mok, P.K.T.
Copyright Year	1966
Abstract	An integrated fixed-frequency adaptive-on-time (AOT) DC-DC converter with fast transient response and enhanced high light-load efficiency is presented. At both Continuous-Conduction-Mode (CCM) and Discontinuous-Conduction-Mode (DCM) operation, the on-time is adaptively controlled by a frequency locked loop so that the switching frequency tracks the reference frequency with less than ±0.5% error in the whole operating range. At CCM operation, the reference frequency is fixed at 1 MHz. At light load with DCM operation, the reference frequency hops between 1 MHz and 1 MHz/N where N = 2 ⁱ and i = 1 to 5 according to the loads without load current sensor. Frequency hopping is introduced to boost the efficiency as well as reduce the EMI noise problem. A glitch-free on-time control circuit is introduced to increase the track accuracy and speed of the frequency locked loop. A mode decision circuit with digital hysteretic window is used to ensure a smooth transition between CCM and DCM operation. An on-time generator with proper logics is used to suppress frequency bouncing during frequency hopping. A prototype with 1.8 V-3.2 V input voltage, 3.0 V-4.2 V output voltage and 0 mA-800 mA load current range has been fabricated in a 0.35 μm 2P4M CMOS process. Load transient measurements verify that 8 μs-20 μs recovery time is achieved for load current increase. Measurement results also show a maximum efficiency of 94.8% is achieved at total output power of 3.269 W, and the light load efficiency is enhanced by the proposed frequency hopping technique with a predictable noise spectrum.
Sponsorship	IEEE Solid-State Circuits Society IEEE Electron Devices Society IEEE Circuits and Systems Society Japan Society of Applied Physics (JSAP) IEEE Microwave Theory and Techniques Society IEEE San Francisco Section Bay Area Council Univ. PA IEEE
Starting Page	2442
Ending Page	2456
Page Count	15
File Size	4172810
File Format	PDF
ISSN	00189200
Volume Number	48
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Switching frequency Frequency control Voltage control Noise Inductors Frequency conversion Control systems light load efficiency Adaptive-on-time boost converter EMI noise problem fixed-frequency frequency hopping
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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