Title :
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
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;
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
DOI :
10.1109/ICIEA.2010.5514876
