A High Power Switch-Mode LED Driver with an Efficient Current Sensing Scheme
A high power buck-boost switch-mode LED driver delivering a constant 350 mA with a power efficient current sensing scheme is presented in this paper. The LED current is extracted by differentiating the output capacitor voltage and maintained by a track and hold. The circuit has been fabricated with a standard 0.35-m AMS CMOS process. Measurement results demonstrated that the power-conversion efficiency of the design is over 90% with a line regulation of 8%/V for an input voltage of 3.3 V and a current output between 200 mA and 350 mA.
Keywords: CURRENT SENSING; LED DRIVER; SWITCH-MODE CONVERTER
Document Type: Research Article
Publication date: 01 April 2010
- The electronic systems that can operate with very low power are of great technological interest. The growing research activity in the field of low power electronics requires a forum for rapid dissemination of important results: Journal of Low Power Electronics (JOLPE) is that international forum which offers scientists and engineers timely, peer-reviewed research in this field.
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