Title :
Effect of target impedance and control loop design on VRM stability
Author :
Chickamenahalli, Shamala A. ; Mahadevan, Suryakumar ; Stanford, Edward ; Merley, Kim
Author_Institution :
Intel Corp., Chandler, AZ, USA
Abstract :
Stability analysis of a VRM used in a typical microprocessor power supply application is presented. With every generation of microprocessors, the decreasing voltages, increasing currents and di/dts are demanding faster VRM transient responses. This analysis focuses on the influence of constantly dropping target impedances and increasing crossover frequencies on the output of multi-phase, high-frequency synchronous rectifier type DC-DC converters. Attempts are made to relate the switching frequency of the VRM to its stability regime. Results are summarized with guidelines on feedback loop stabilization under diminishing target impedances
Keywords :
DC-DC power convertors; computer power supplies; feedback; rectifying circuits; stability; switching circuits; transient response; voltage control; voltage regulators; VRM stability; VRM transient responses; buck converter stage; control loop design; crossover frequencies; feedback control design; feedback loop stabilization; high-frequency synchronous rectifier DC-DC converters; microprocessor power supply; multi-phase DC-DC converters; switching frequency; target impedance; voltage regulator modules; DC-DC power converters; Frequency conversion; Guidelines; Impedance; Microprocessors; Power supplies; Rectifiers; Stability analysis; Switching frequency; 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.2002.989247
