Title :
An adaptive segment output stage for PWM DC-DC converter
Author :
Ming Luo ; Ping Luo ; Yi-Kun Mo
Author_Institution :
State Key Lab. of Electron. Thin Films & Integrated Devices, Univ. of Electron. Sci. & Technol. of China, Chengdu, China
fDate :
Oct. 29 2012-Nov. 1 2012
Abstract :
A novel adaptive segment output stage used in PWM DC-DC converter is proposed. By auto selecting the optimum width of the power MOSFET according to the load current, it can help to improve conversion efficiency. Two different circuits, current sensing (CS) and time-digital converter (TDC) are presented to estimate the load current. The CS and TDC alternately work in continuous mode (CCM) and discontinuous mode (DCM). A buck DC-DC converter with the adaptive segment output stage is designed and simulated in a 0.13μm standard CMOS process. The simulation results show that the maximum efficiency improvement of the converter with adaptive segment reaches 8% at 5mA compared to converter without segment.
Keywords :
DC-DC power convertors; PWM power convertors; power MOSFET; time-digital conversion; CCM; DCM; PWM DC-DC converter; TDC; adaptive segment output stage; buck DC-DC converter; conversion efficiency; current sensing circuit; discontinuous mode; load current; optimum width; power MOSFET; standard CMOS process; time-digital converter circuit; CMOS process; Capacitors; Delay; Power MOSFET; Pulse width modulation; Sensors;
Conference_Titel :
Solid-State and Integrated Circuit Technology (ICSICT), 2012 IEEE 11th International Conference on
Conference_Location :
Xi´an
Print_ISBN :
978-1-4673-2474-8
DOI :
10.1109/ICSICT.2012.6467721
