A 16–28-W 92.8%-Efficiency Monolithic Quasi-Resonant LED Driver With Constant-Duty-Ratio Frequency Regulator

Author

Lisong Li ; Yuan Gao ; Mok, Philip K. T. ; Sun, I-Shan Michael ; Namkyu Park

Author_Institution

Dept. of Electron. & Comput. Eng., Hong Kong Univ. of Sci. & Technol., Kowloon, China

Volume

62

Issue

12

fYear

2015

Firstpage

1199

Lastpage

1203

Abstract

This brief presents a monolithic high-voltage light-emitting diode (LED) driver for lighting applications. The LED driver is able to operate at high switching frequency because large switching loss is eliminated by zero-voltage switching. Inductor values are therefore reduced. A constant-duty-ratio frequency regulator (CDFR) is proposed to regulate the LED current, and the small signal characteristics of the proposed LED driver with CDFR are analyzed. The proposed design, including the controller and power transistor, was fabricated in MagnaChip 0.35-μm 700-V bipolar-CMOSLDMOS process. The LED driver with 2 × 3.9 μH inductors switches at around 5.4 MHz and powers up 16-28 1-W LEDs. Experimental results show that the LED driver achieves peak efficiency of 92.8% within the input voltage range of 55-120 V.

Keywords

CMOS integrated circuits; driver circuits; frequency control; light emitting diodes; lighting; monolithic integrated circuits; zero voltage switching; CDFR; LED current; MagnaChip; bipolar-CMOS LDMOS process; complementary metal oxide semiconductor; constant-duty-ratio frequency regulator; efficiency 92.8 percent; inductor switch; laterally diffused MOSFET; light emitting diode driver; lighting application; monolithic quasiresonant LED driver; power 16 W to 28 W; power transistor; size 0.35 mum; small signal characteristic; switching frequency; switching loss; voltage 55 V to 120 V; voltage 700 V; zero-voltage switching; Gain; Inductors; Light emitting diodes; Switching frequency; Voltage measurement; Voltage-controlled oscillators; Zero voltage switching; Frequency modulator; LED driver; frequency modulator; high voltage; inductance reduction; light-emitting diode (LED) driver; monolithic; small signal analysis; zero-voltage switching (ZVS); zerovoltage switching;

fLanguage

English

Journal_Title

Circuits and Systems II: Express Briefs, IEEE Transactions on

Publisher

ieee

ISSN

1549-7747

Type

jour

DOI

10.1109/TCSII.2015.2468925

Filename

7206566