Browsing by Author "Hsu, Kai-Hsiu"

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A High Efficiency Current-Mode DC-DC Step-Down Converter with Wide Range of Output Current
(2010)
Chen, Chia-Min
;
Hsu, Kai-Hsiu
;
Hung, Chung-Chih
;
電機工程學系
;
Department of Electrical and Computer Engineering
This paper presents a high efficiency current-mode DC-DC step-down converter with wide range of output current. The converter adaptively operates as Pulse-Width Modulation (PWM). An on-chip current sensing technique is employed to reduce external components and no extra I/O pins are needed for the current-mode controller. A soft-start operation is designed to eliminate the excess large current during the startup of the regulator. The circuit has been designed with TSMC 2P4M 0.35 mu m CMOS process. The range of the supply voltage is from 2 to 5V, which is suitable for single-cell lithium-ion battery.
Freewheel charge-pump controlled single-inductor multiple-output step-up DC-DC converter
(2013-01-01)
Chen, Chia-Min
;
Hsu, Kai-Hsiu
;
Hung, Chung-Chih
;
電機工程學系
;
Department of Electrical and Computer Engineering
This paper presents a freewheel-charge-pump-controlled design for a single-inductor multiple-output (SIMO) DC-DC Converter. By applying the freewheel-charge-pump-controlled (FCPC) technique, the freewheel switching time is reused, and two extra charge-pump outputs are provided by time recycling, with no cost in time sequences. The converter has two step-up outputs and two charge-pump outputs that can be higher or lower than the input supply. The converter utilizes a 1 mu H inductor, 4.7 mu F charge-pump capacitors and 33 mu F output capacitors at a frequency of 1 MHz. The proposed converter shows low cross-regulation and achieves a maximum loading current of 70 mA. Fabricated in a 0.18-mu m CMOS process, the proposed circuit occupies 1.3 x 1.3 mm(2). Experimental results demonstrate that the converter successfully generates four well-regulated outputs with a single inductor. The supply voltage ranged from 1.6 to 2.5 V and the load regulation performance was 0.08, 0.05, 1.7, and 1.9 mV/mA for V-O1, V-O2, V-O3 and V-O4, respectively.