Dual Mode Control Multiphase DC/DC Converter for CPU Power

Lin, Liwei; Chang, Chung-Hsing; Chiu, Huang‐Jen; Mou, Shann-Chyi

doi:10.1109/ipemc.2006.4777993

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…To solve the problems mentioned earlier, several control methods have been researched to improve the transient characteristics of the DC-DC converter, [15][16][17][18][19][20][21][22][23][24] but these have failed to meet expectations. The PWM control method with a high switching frequency [15][16][17] consumes excessive switching power.…”

Section: Introductionmentioning

confidence: 99%

“…The voltage-voltage-current mode control method 20 employs a compensation circuit that is very complicated to implement. The dual mode control method 21,22 requires a large printed circuit board for the additional inductors and power switches. The compensated error amplifier method 23,24 cannot adaptively operate according to load variations.…”

Section: Introductionmentioning

confidence: 99%

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A fast transient LED driver with adaptive frequency control according to load variation for large‐sized LCD backlights

2017

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A fast transient light‐emitting diode (LED) driver is proposed for large‐sized liquid crystal display TV backlights in attempt to shorten the recovery time and to reduce the voltage fluctuation, while maintaining a high power efficiency. The direct current‐direct current (DC–DC) converter in the proposed LED driver accurately detects the load variation using the dimming data and then adjusts the slew rate and operating frequency according to the detected load variation. Thus, it rapidly controls the turn‐on time of the power switch and then controls the inductor current so that the output of the proposed LED driver can be accurately regulated during the load transient time. To verify the performance of the proposed LED driver, a DC–DC converter and an expandable LED current controller were fabricated using a 0.35‐μm bipolar–complementary metal–oxide–semiconductor (CMOS)–double‐diffused metal–oxide–semiconductor (DMOS) process technology and assembled with 48 LED channels for measurement. The measurement results show that the proposed LED driver improves the recovery time and voltage fluctuation by 45.1% and 45.6%, respectively. In addition, it achieves a maximum power of 115.2 W and a maximum power efficiency of 89.2%. Therefore, the proposed LED driver is suitable for high‐end applications such as large‐sized LED TV backlight modules.

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