Title :
Design considerations for VRM transient response based on the output impedance
Author :
Yao, Kaiwei ; Meng, Yu ; Xu, Peng ; Lee, Fred C.
Author_Institution :
Bradley Dept. of Electr. & Comput. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA
Abstract :
This paper discusses the transient response of voltage regulator modules (VRMs) based on small-signal models. The concept of constant resistive output impedance design for the VRM is proposed, and its limitation in application is analyzed. The impact of the output filter and the feedback control bandwidth shows that there is an optimum design for the VRM to achieve fast transient response, small size and good efficiency. Simulations and experimental results prove the theoretical analysis
Keywords :
control system analysis; control system synthesis; electric impedance; feedback; transient response; voltage control; voltage regulators; VRMs; constant resistive output impedance design; feedback control bandwidth; optimum design; output filter; small-signal models; transient response; voltage regulator modules; Capacitors; Costs; Current supplies; Feedback control; Impedance; Microprocessors; Power electronics; Regulators; Transient response; Voltage;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2002. APEC 2002. Seventeenth Annual IEEE
Conference_Location :
Dallas, TX
Print_ISBN :
0-7803-7404-5
DOI :
10.1109/APEC.2002.989221
