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Article: Studies from National Taiwan University yield new information about circuits research.
- Article from:
- China Weekly News
- Article date:
- November 17, 2009
CopyrightCOPYRIGHT 2009 NewsRX. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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"This brief presents a high-efficiency currentregulated charge pump for a white light-emitting diode driver. The charge pump incorporates no series current regulator, unlike conventional voltage charge pump circuits," researchers in Taipei, Taiwan report.
"Output current regulation is accomplished by the proposed pumping current control. The experimental system, with two 1-mu F flying and load capacitors, delivers a regulated 20-mA current from an input supply voltage of 2.8-4.2 V. The measured variation is less than 0.6% at a pumping frequency of 200 kHz," wrote C.H. Wu and colleagues, National Taiwan University.
The researchers concluded: "The active ...
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