DocumentCode :
1256503
Title :
A SIMO Parallel-String Driver IC for Dimmable LED Backlighting With Local Bus Voltage Optimization and Single Time-Shared Regulation Loop
Author :
Chen, Hai ; Zhang, Yi ; Ma, Dongsheng
Author_Institution :
Univ. of Arizona, Tucson, AZ, USA
Volume :
27
Issue :
1
fYear :
2012
Firstpage :
452
Lastpage :
462
Abstract :
Traditional LED drivers with multiple converters for powering up multiple strings in parallel suffer from high system volume and cost. The reported literature with single converter and dynamic bus voltage offers compact designs. However, the performance on power consumption is degraded. Meanwhile, all the aforementioned approaches require multiple current regulation elements, which inflict current balance errors due to mismatches. A compact single-inductor multiple-output parallel-string LED driver with time-multiplexing control is, thus, proposed. It can independently optimize local bus voltages for power loss reduction. In addition, a single time-shared control loop is proposed for current regulation in multiple parallel strings, resulting in a dramatic reduction of current balance errors. A 0.35 μm CMOS prototype achieves 2.8 times loss reduction over the reported literature, with a current balance error well controlled below 1.7%. The control scheme also offers flexible dimming for advanced backlighting operations.
Keywords :
CMOS integrated circuits; driver circuits; light emitting diodes; CMOS prototype; SIMO parallel-string driver IC; balance error; compact single-inductor multiple-output parallel-string LED driver; dimmable LED backlighting; dynamic bus voltage; local bus voltage optimization; power consumption; power loss reduction; single time-shared regulation loop; size 0.35 mum; time-multiplexing control; Current control; Driver circuits; Lighting; Optimization; Power demand; Power electronics; Voltage control; Backlighting; LED driver; current balance error; dimming; low power loss; single-inductor multiple-output (SIMO); time multiplexing;
fLanguage :
English
Journal_Title :
Power Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8993
Type :
jour
DOI :
10.1109/TPEL.2011.2160404
Filename :
5928421
Link To Document :
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