The Switched-Capacitor step-down DC-DC converter with improved voltage stability and load range

Author

Chen, Yie-Tone ; Liu, Kun-Jing

Author_Institution

Dept. of Electr. Eng., Nat. Yunlin Univ. of Sci. & Technol., Yunlin, Taiwan

fYear

2010

fDate

15-17 June 2010

Firstpage

1389

Lastpage

1393

Abstract

A 5V to 1.1V Switched-Capacitor (SC) DC-DC converter with a novel PFM control is proposed here to achieve a steady output voltage with wide load range. The advantage is through PFM control, the duty cycle of the converter can be fixed to obtain the optimum efficiency even in wide load condition. For the novel PFM control, it uses an error amplifier to sense the output voltage and produce an error signal to change the switching frequency of the converter. Besides, a digital circuit is used to fix the duty-cycle to obtain the best efficiency. This paper will then prove the proposed PFM control has better performance than other control methods.

Keywords

DC-DC power convertors; amplifiers; digital circuits; PFM control; digital circuit; error amplifier; load range; steady output voltage; switched-capacitor step-down DC-DC converter; voltage 1.1 V; voltage 5 V; voltage stability; Capacitors; Current control; DC-DC power converters; Error correction; Pulse width modulation; Pulse width modulation converters; Stability; Switches; Switching converters; Voltage control; PFM; Switched-capacitor (SC); duty-cycle; wide load;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics and Applications (ICIEA), 2010 the 5th IEEE Conference on

Conference_Location

Taichung

Print_ISBN

978-1-4244-5045-9

Electronic_ISBN

978-1-4244-5046-6

Type

conf

DOI

10.1109/ICIEA.2010.5514876

Filename

5514876