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A fast-switching current-pulse driver for LED backlight

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7 Author(s)
Jang-Su Kim ; VLSI Circuit & System Lab., Chungbuk National University, Cheongju, Republic of Korea ; Yong-Kyu Lee ; Jee-Sue Lee ; Young-Kyu Shin
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In this paper, a fast-switching current-pulse driver for light emitting diodes (LED) backlight is proposed. It uses a regulated drain current mirror (RD-CM) 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 5 V/40 V 0.5 mum BCD process. It reduces the switching delay to 360 ns from 700 ns of the conventional current-pulse driver.

Published in:

2009 IEEE International Symposium on Circuits and Systems

Date of Conference:

24-27 May 2009