A dimmable LED driver with an ambient light sensor based on a constant off-time control technique

Yuan Ta Hsieh, Jian Fu Wu, Chiao Li Fang, Hann Huei Tsai, Ying Zong Juang, Bin-Da Liu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

This paper presents an asynchronous boost-type light-emitting diode (LED) driver, integrating an ambient light sensor (ALS), based on a constant off-time control technique. The LED driver automatically regulates the LED current according to the surrounding illumination as sensed by the on-chip ALS. In backlighting applications, the brightness of the light source is adjusted inversely; therefore, we enabled the selection of two modes of operation: illumination and backlighting. The proposed design is capable of reducing power dissipation for both illumination and backlighting applications. For verification, a prototype was fabricated using the TSMC 0.25-μm 60-V bipolar-CMOS-DMOS process with a chip size of 1900μm × 1330μm.

Original languageEnglish
Title of host publicationICEMS 2012 - Proceedings
Subtitle of host publication15th International Conference on Electrical Machines and Systems
Publication statusPublished - 2012 Dec 1
Event15th International Conference on Electrical Machines and Systems, ICEMS 2012 - Sapporo, Japan
Duration: 2012 Oct 212012 Oct 24

Publication series

NameICEMS 2012 - Proceedings: 15th International Conference on Electrical Machines and Systems

Other

Other15th International Conference on Electrical Machines and Systems, ICEMS 2012
CountryJapan
CitySapporo
Period12-10-2112-10-24

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Mechanical Engineering

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