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A Fast-Switching Current-Pulse Driver for LED Backlight  

Yang, Byung-Do (Department of Electrical and Computer Engineering, Chbuk National University)
Lee, Yong-Kyu (Department of Electrical and Computer Engineering, Chbuk National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.46, no.7, 2009 , pp. 39-46 More about this Journal
Abstract
A fast-switching current-pulse driver for light emitting diode (LED) backlight is proposed. It uses a regulated drain current mirror (RD-CM) [1] and a high-voltage NMOS transistor (HV-NMOS). It achieves the fast-response current-pulse switching by using a dynamic gain-boosting amplifier (DGB-AMP). The DGB-AMP does not discharge the large HV-NMOS gate capacitance of the RD-CM when the output current switch turns off. Therefore, it does not need to charge the HV-NMOS gate capacitance when the switch turns on. The proposed current-pulse driver achieves the fast current switching by removing the repetitive gate discharging and charging. Simulation results were verified with measurements performed on a fabricated chip using a 5V/40V 0.5um BCD process. It reduces the switching delay to 360ns from 700ns of the conventional current-pulse driver.
Keywords
Current-pulse driver; Dynamic gain-boosting amplifier; Fast-switching; LED backlight;
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