Title: SAR-Controlled Adaptive Off-Time Technique Without Sensing Resistor for Achieving High Efficiency and Accuracy LED Lighting System
Authors: Liu, Chao-Hsuan
Hsieh, Chun-Yu
Hsieh, Yu-Chiao
Tai, Ting-Jung
Chen, Ke-Horng
電控工程研究所
Institute of Electrical and Control Engineering
Keywords: Adaptive off-time;hysteretic current control (HCC);on-chip low-side current sensing;peak current control (PCC);pulsewidth modulation (PWM) dimming;successive approximation register (SAR)
Issue Date: 1-Jun-2010
Abstract: A successive approximation register (SAR) is utilized to control adaptive off-time in order to regulate accurate light-emitting diode (LED) current and improve efficiency of LED driver. The proposed SAR-controlled adaptive off-time technique without the external sensing resistor can sense the current flowing through LEDs during the turning on of the N-type power MOSFET, as well as provide adaptive off-time depending on the input voltage and the numbers of LED, to obtain an accurate LED current. Experimental results show the inductor current ripple is kept within +/- 15% of the DC current. As a result, line regulation is guaranteed in this proposed design.
URI: http://dx.doi.org/10.1109/TCSI.2009.2028643
http://hdl.handle.net/11536/5297
ISSN: 1549-8328
DOI: 10.1109/TCSI.2009.2028643
Journal: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
Volume: 57
Issue: 6
Begin Page: 1384
End Page: 1394
Appears in Collections:Articles


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