A fast-switching current-pulse driver for LED backlight

Kim, Jang-Su; Lee, Yong-Kyu; Lee, Jee-Sue; Shin, Young-Kyu; Tark, Jung-Hyun; Ryu, Koungmin; Yang, Byung‐Do

doi:10.1109/iscas.2009.5118120

Cited by 13 publications

(3 citation statements)

References 8 publications

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“…In this paper, the experimental results show the current sensing ratio at 1 kHz dimming frequency is proposed. Another method was proposed in [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A high-efficient WLED driver using light-balanced-controlled techniques with current-locked loops

Chen

Hwang

Guo

et al. 2012

Analog Integr Circ Sig Process

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The proposed high-efficient WLED driver using light-balanced-controlled techniques with currentlocked loops is presented in this paper. This LED driver has 500:1 current sensing ratio and 1 kHz PWM dimming frequency. The maximum output current of the buck converter is 100 mA and the output voltage range is from 3.5 to 4.8 V with a 20 and 18 lH off-chip capacitor and inductor, respectively. The maximum efficiency of the proposed LED driver is 87.8 % and the current difference between each LED string is 1.33 %. And it is fabricated with TSMC 0.35 lm 2P4 M CMOS processes. The chip area is 1.52 mm 9 1.36 mm.

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“…In this paper, the experimental results show the current sensing ratio at 1 kHz dimming frequency is proposed. Another method was proposed in [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A high-efficient WLED driver using light-balanced-controlled techniques with current-locked loops

Chen

Hwang

Guo

et al. 2012

Analog Integr Circ Sig Process

View full text Add to dashboard Cite

show abstract

“…A better power efficiency, wider color gamut, better dimming capability, longer lifetime and more environmental friendly can be obtained by using LEDs as the backlight [2][3]. Boost DC-DC converter is needed to step up the supply voltage to a higher output voltage to drive series of LEDs.…”

Section: Introductionmentioning

confidence: 99%

A 14V-output adaptive-off-time boost converter with quasi-fixed-frequency in full loading range

Lee

Jing

Mok

2011

2011 IEEE International Symposium of Circuits and Systems (ISCAS)

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A monolithic quasi-fixed-frequency DC-DC boost converter with a modified-adaptive-off-time (MAOF) control is presented. To achieve a quasi-fixed-frequency in whole loading range, the new MAOF control is able to overcome the frequency variation problems naturally exist in traditional adaptive-offtime control in both continuous-and discontinuous-conductionmode (CCM and DCM) operations. The MAOF control boost converter was implemented with a 0.35μm High Voltage (HV) CMOS process. With 3V -4.2V input voltage, 10V -14V output voltage and 30mA -300mA load current range, simulated results show that the switching frequency keeps constant at 960kHz to within ±5% across the whole operation range.

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“…Most of the dc LED drivers are based on existing switched mode power supply techniques and topologies such as buck, SEPIC, Cuk and boost converters [5][6][7][8][9][10][11][12]. The traditional designs are good for electrical performance but could suffer relatively poor reliability due to the use of electrolytic capacitors.…”

Section: Introductionmentioning

confidence: 99%

A comparative study on the circuit topologies for offline passive light-emitting diode (LED) drivers with long lifetime & high efficiency

Chen

Hui

2010

2010 IEEE Energy Conversion Congress and Exposition

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In this paper, we present a practical comparison on a range of circuit topologies suitable for passive LED drivers. These circuits consist of passive components and do not require any semiconductor controlled switches, auxiliary power supply and control integrated circuits. The power loss components, the energy efficiency and the output current ripple are examined. These passive LED drivers are particularly suitable for outdoor applications such as street lighting in which extreme weather conditions including lightning and wide temperature range, and maintenance issues are major concerns but the size of the LED drivers is not critical. With extremely simple and reliable circuitry, these passive LED drivers achieve remarkably high energy efficiency. Energy efficiency of 92-94% has been achieved for LED systems of 50W in this study.

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A fast-switching current-pulse driver for LED backlight

Cited by 13 publications

References 8 publications

A high-efficient WLED driver using light-balanced-controlled techniques with current-locked loops

A high-efficient WLED driver using light-balanced-controlled techniques with current-locked loops

A 14V-output adaptive-off-time boost converter with quasi-fixed-frequency in full loading range

A comparative study on the circuit topologies for offline passive light-emitting diode (LED) drivers with long lifetime & high efficiency

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