Title :
Design considerations for VRM transient response based on the output impedance
Author :
Yao, Kaiwei ; Xu, Ming ; Meng, Yu ; Lee, Fred C.
Author_Institution :
Bradley Dept. of Electr. & Comput. Eng., State Univ., Blacksburg, VA, USA
Abstract :
This paper discusses the transient response of voltage regulator modules (VRMs) based on the small-signal models. The concept of constant resistive output impedance design for the VRM is proposed, and its limitations in applications are analyzed. The impacts of the output filter and the feedback control bandwidth show that there is an optimal design that allows the VRM to achieve fast transient response, small size and good efficiency. Simulations and experimental results prove the theoretical analysis.
Keywords :
electric current control; electric impedance; feedback; power convertors; transient response; voltage control; voltage regulators; buck converter; constant resistive output impedance design; current-mode control; feedback control bandwidth; good efficiency; output filter; output impedance; small-signal models; transient response; voltage regulator modules; Capacitors; Costs; Current supplies; Equivalent circuits; Feedback control; Impedance; Microprocessors; Regulators; Transient response; Voltage;
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2003.818824
