Title :
A 1500mA, 10MHz on-time controlled buck converter with ripple compensation and efficiency optimization
Author :
Lu, Danzhu ; Yu, Jiale ; Hong, Zhiliang ; Mao, Jingwen ; Zhao, Hui
Author_Institution :
State Key Lab. of ASIC & Syst., Fudan Univ., Shanghai, China
Abstract :
A 10MHz self-adaptive on-time controlled buck DC-DC converter with optimized efficiency over full load range is presented. A low-cost passive ripple compensation scheme (PRC) and a self-adaptive on-time generator (SAOTG) are proposed to solve the system stability and frequency variation problem. Meanwhile automatic power transistor sizing (APTS) technique is used to improve the overall efficiency especially in heavy load. The converter has been implemented in 2P4M 0.35μm CMOS process. The measurement results show that the output ripple is smaller than 10mV and the overshoot of load transient response is realized as small as 8mV @ 200mA step. With APTS technique in ultra heavy load and PFM control in light load, the efficiency keeps over 81% for load range from 20mA to 1500mA and the peak efficiency reaches 88.43%.
Keywords :
CMOS integrated circuits; DC-AC power convertors; circuit optimisation; 2P4M 0.35μm CMOS process; PFM control; automatic power transistor sizing technique; current 1500 mA; efficiency optimization; frequency 10 MHz; load transient response; low-cost passive ripple compensation scheme; ripple compensation; self-adaptive on-time controlled buck DC-DC converter; self-adaptive on-time generator; size 0.35 mum; Capacitors; Circuit stability; Inductors; Mathematical model; Stability analysis; Switching frequency; Voltage control;
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2012 Twenty-Seventh Annual IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
978-1-4577-1215-9
Electronic_ISBN :
978-1-4577-1214-2
DOI :
10.1109/APEC.2012.6165976
