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http://dx.doi.org/10.5762/KAIS.2020.21.12.702

DC-DC integrated LED Driver IC design with power control function  

Lee, Seung-Woo (P&L Semi)
Lee, Jung-Gi (Mechatronics, Korea Polytechnic University)
Kim, Sun-Yeob (Intelligent Information& Communication Namseoul University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.21, no.12, 2020 , pp. 702-708 More about this Journal
Abstract
Recently, as LED display systems have become larger, research on effective power control methods for the systems has been in progress. This paper proposes a power control method to minimize power loss due to the difference in LED characteristics for each channel of a backlight unit (BLU) system. The proposed LED driver IC has a power optimization function and detects the minimum headroom voltage for constant current operation of all channels and linearly controls the DC-DC converter output. Thus, it minimizes power consumption due to unnecessary additional voltage. In addition, it does not require a voltage sensing comparator or a voltage generation circuit for each channel. This has a great advantage in reducing the chip size and for stabilization when implementing an integrated circuit. In order to verify the proposed function, an IC was designed using Cadence and Synopsys' design tools, and it was fabricated with a Magnachip 0.35um 5V/40V CMOS process. The experiments confirmed that the proposed power control method controls the minimum required voltage of the BLU system.
Keywords
LED; Driver IC; BLU; Power Control; DC-DC;
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