An inventive approach of stability for Voltage Regulator Modules with high frequency multiphase buck converters

Fast transient response and very low ripple are the most important requirements for the Voltage Regulator Modules; (VRMs), which are used to power advanced microprocessors. In this paper, an inventive approach of stability to multiphase buck converter design with feedback compensation is proposed. To demonstrate the stability of multiphase buck converter, a VRM prototype with two phase interleaved buck converter was designed and tested. The two phase buck converter indicates paralleling of two buck converters with interleaved switching instants. A new design technique for feedback compensation with peak current mode control is attempted in the prototype designed. This type of feedback compensation was chosen as it gives higher bandwidth for improving the transient response. The two phase buck converter has been designed and simulated using ORCAD software. Simulation results were found to be in good agreement with theoretical predictions. These predictions were supported by experimental results on the 30V/9V, 12A, 200 KHz, high frequency two phase interleaved buck converter.