Title :
Quasi-SM controller for SIDO buck converter with self-adaptive free-wheeling current level
Author :
Qing Liu ; Xiaobo Wu ; Mingyang Chen ; Xiaoting Shen ; Peifeng Pan
Author_Institution :
Inst. of VLSI Design, Zhejiang Univ., Hangzhou, China
Abstract :
A Single-Inductor Dual-Output (SIDO) buck converter with a novel quasi-sliding mode (SM) controller is presented in this paper. Instead of keeping as a constant current, the free-wheeling current level can vary according to the load condition to extend the load range while maintaining high power efficiency and less cross regulation at the same time. To verify the feasibility of the proposed technique, a SIDO buck converter with two regulated output voltages, 1.8V and 3.3V, is designed and fabricated in HEJIAN 0.35 μm CMOS process. Simulation and experiment results show that the cross regulation can be reduced to as low as 0.057 mV/mA when the load changes from 50mA to 100mA.
Keywords :
CMOS integrated circuits; DC-DC power convertors; adaptive control; electric current control; variable structure systems; CMOS process; SIDO buck converter; current 100 mA; current 50 mA; quasiSM controller; quasisliding mode controller; self-adaptive free-wheeling current level; single inductor dual output buck converter; size 0.35 mum; voltage 1.8 V; voltage 3.3 V; CMOS process; Control systems; Inductors; Load modeling; Transient response; Very large scale integration; Voltage control; DC-DC converter; PCCM; SIDO; cross-regulation; self-adaptive free-wheeling current level; sliding mode control;
Conference_Titel :
Electron Devices and Solid State Circuit (EDSSC), 2012 IEEE International Conference on
Conference_Location :
Bangkok
Print_ISBN :
978-1-4673-5694-7
DOI :
10.1109/EDSSC.2012.6482886
