isscc2011 LED Driver

princesunny

A 1.2-A Buck-Boost LED Driver With On-Chip Error Averaged SenseFET-Based Current Sensing Technique

Rao, S.;   Khan, Q.;   Bang, S.;   Swank, D.;   Rao, A.;   McIntyre, W.;   Hanumolu, P. K.;   
School of EECS, Oregon State University, Corvallis,

This paper appears in: Solid-State Circuits, IEEE Journal of
Issue Date: Dec. 2011
Volume: 46 Issue:12
On page(s): 2772 - 2783
ISSN: 0018-9200
Digital Object Identifier: 10.1109/JSSC.2011.2162921  
Date of Publication: 01 September 2011
Date of Current Version: 21 November 2011
Sponsored by: IEEE Solid-State Circuits Society  

[size=1.085em]ABSTRACT

This paper presents circuit techniques to improve the efficiency of high-current LED drivers. An error-averaged, senseFET-based current sensing technique is used to regulate the LED current accurately. Because the proposed scheme eliminates the series current-regulation element present in all conventional LED drivers, it greatly improves efficiency and reduces cost. The converter operates in three different operating modes, namely buck, buck-boost, and boost modes, and achieves high efficiency over the entire Li-Ion battery range (3–5.5 V). Fabricated in 0.5-$mu{hbox {m}}$ CMOS process, the prototype occupies an active area of 5 ${hbox {mm}}^{2}$ . At 1.2-A LED current, the driver achieves an efficiency improvement of over 13% compared to current-regulation-element-based LED drivers. Measured LED current accuracy is better than 2.8% over the entire range of the battery and its standard deviation measured across seven devices is less than 1.6%. The peak efficiencies are 90.7% and 86% at 600- and 1200-mA currents, respectively.

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Jason_ke

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回复 1# princesunny

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Jason_ke

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