NDLI: Variable Off-Time Control Loop for Current-Mode Floating Buck Converters in LED Driving Applications

Content Provider	IEEE Xplore Digital Library
Author	Anghel, V. Bartholomeusz, C. Vasilica, A.G. Pristavu, G. Brezeanu, G.
Copyright Year	1966
Abstract	A versatile controller architecture, used in current-mode floating buck converters for LED driving, is developed. State-of-the-art controllers rely on a fixed switching period and variable duty cycle, focusing on current averaging circuits. Instead, the proposed controller architecture is based on fixed peak current and adaptable off time as the average current control method. The control loop is comprised of an averaging block, transconductance amplifier, and an innovative time modulator. This modulator is intended to provide constant control loop response regardless of input voltage, current storage inductor, and number of LEDs in order to improve converter applicability for LED drivers. Fabricated in a 5 V standard 0.5 μm CMOS technology, the prototype controller is implemented and tested in a current-mode floating buck converter. The converter exhibits sound continuous conduction mode (CCM) operation for input voltages between 11 and 20 V, and a wide inductor range of 100-1000 μH. In all instances, the measured average LED current variation was lower than 10% of the desired value. A maximum conversion efficiency of 91% is obtained when driving 50 mA through four LEDs (with 14 V input voltage and an inductor of 470 μH). A stable CCM converter operation is also proven by simulation for nine LEDs and 45 V input voltage.
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	1571
Ending Page	1579
Page Count	9
File Size	2449080
File Format	PDF
ISSN	00189200
Volume Number	49
Issue Number	7
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	Light emitting diodes Modulation Inductors Topology Transconductance Voltage control Current control wide range of converter parameters Constant response current-mode floating buck converter fixed peak current LED driver nonlinear time modulator variable off time
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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