TY - GEN
T1 - A dimmable LED driver with an ambient light sensor based on a constant off-time control technique
AU - Hsieh, Yuan Ta
AU - Wu, Jian Fu
AU - Fang, Chiao Li
AU - Tsai, Hann Huei
AU - Juang, Ying Zong
AU - Liu, Bin-Da
PY - 2012/12/1
Y1 - 2012/12/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84873468913&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84873468913&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84873468913
SN - 9784886860774
T3 - ICEMS 2012 - Proceedings: 15th International Conference on Electrical Machines and Systems
BT - ICEMS 2012 - Proceedings
T2 - 15th International Conference on Electrical Machines and Systems, ICEMS 2012
Y2 - 21 October 2012 through 24 October 2012
ER -