NDLI: A Monolithic Digital Ripple-Based Adaptive-Off-Time DC-DC Converter With a Digital Inductor Current Sensor

Content Provider	IEEE Xplore Digital Library
Author	Man Pun Chan Mok, P.K.T.
Copyright Year	1966
Abstract	A ripple-based digital controller requires inductor current ripple as feedback signals and analog RC inductor current sensors can be used for sensing the ripple. However, the passive RC components are bulky to integrate on-chip and the digital controller cannot use the analog ripple for the control purpose unless extra ADCs are available to quantize the signal. Therefore, a digital inductor current sensor is presented in this paper for obtaining the ripple in the digital domain. As compared to the existing designs, the digital inductor current sensor does not require extra ADCs or knowledge of the inductor DCR. A ripple-based digital controller is designed to demonstrate how the digital sensor can be utilized. A digital frequency-lock-loop is also incorporated into the digital controller to alleviate the problem of variable switching-frequency that is commonly found in the ripple-based control scheme. Both the digital sensor and controller are fabricated in UMC 0.13 μm digital CMOS process with a small chip area of 220 μm×220 μm. Measurements results show that a 2 MHz (max. ±6.5% in variation) buck converter achieves load-transient responses of about 5 μs by using the digital controller. The peak efficiency is 91% at a nominal load current of 100 mA.
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	1837
Ending Page	1847
Page Count	11
File Size	2352550
File Format	PDF
ISSN	00189200
Volume Number	49
Issue Number	8
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Inductors Switches Transforms Sensors System-on-chip Hardware ripple-based controller Adaptive-off-time control digitally-controlled switching converter digital inductor current sensor frequency-lock-loop
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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