A LED driver based on pulse current modulator

Author

Lin, Ming-Shian ; Chen, Chern-Lin

Author_Institution

Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan

fYear

2011

fDate

6-11 March 2011

Firstpage

2054

Lastpage

2058

Abstract

This paper presents a LED driver based on pulse current modulator. The proposed pulse current modulator consists of a voltage-controlled oscillator (VCO), a pulse generator, a series buffer, a single stage amplifier, a power transistor, and a sense resistance. A complete analysis and introduction of the proposed pulse current driving technique and the conventional driving technique will be presented in this paper. The LED driver used in the pulse current modulator driving technique supplies pulse driving current between 0 mA~250 mA and operates between 500 kHz~1 MHz. The LED driver is fabricated with CMOS 0.35-μm 2P4M technology. The chip area with pads is 935μm × 956μm.

Keywords

CMOS integrated circuits; driver circuits; light emitting diodes; modulators; pulse circuits; CMOS 2P4M technology; LED driver; current 0 mA to 250 mA; frequency 500 kHz to 1 MHz; power transistor; pulse current modulator; pulse current modulator driving technique; pulse generator; sense resistance; single stage amplifier; size 0.35 mum; voltage-controlled oscillator; Driver circuits; Light emitting diodes; Pulse generation; Pulse width modulation; Resistance; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition (APEC), 2011 Twenty-Sixth Annual IEEE

Conference_Location

Fort Worth, TX

ISSN

1048-2334

Print_ISBN

978-1-4244-8084-5

Type

conf

DOI

10.1109/APEC.2011.5744879

Filename

5744879