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

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7 Author(s)
Rao, S. ; Sch. of Electr. Eng. & Comput. Sci., Oregon State Univ., Corvallis, OR, USA ; Khan, Q. ; Bang, S. ; Swank, D.
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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-μm CMOS process, the prototype occupies an active area of 5 mm2. 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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Solid-State Circuits, IEEE Journal of  (Volume:46 ,  Issue: 12 )