Open AccessChip implementation of high‐efficient light‐emitting diode dimming driver for high‐power light‐emitting diode lighting system
Author(s) -
Hsia ShihChang,
Sheu MingHwa,
Lai ShengYueh
Publication year - 2015
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2013.0805
Subject(s) - chip , light emitting diode , driver circuit , diode , led lamp , power (physics) , electrical engineering , voltage , optoelectronics , electronic engineering , computer science , materials science , engineering , physics , quantum mechanics
This study presents a novel high‐power light‐emitting diode (LED) driver based on chip‐level design. We propose a multi‐level current approach to LED dimming, rather than pulsed current. The LED driving current can be controlled directly using a digital interface, making it more user‐friendly. An analysis of output impedance and driving current demonstrates how the driver can be realised on a single chip. A prototype chip was designed using the second generation TSMC 0.25 μm high‐voltage technology. The chip area, including I/O pads and power driver, is only 0.89 mm 2 . The proposed chip is able to drive a 60 W LED panel at maximum output by regulating current in 16 steps for LED dimming. Measurement results indicate that driving efficiency reaches 96% and lighting efficiency is 20% higher than that achieved using pulsed‐width modulation. Furthermore, the proposed chip is able to reduce interference, improve lighting efficiency, and prolong the lifespan of LED devices.