Performance and design of a novel constant frequency 48 V regulator module

This paper presents a novel 48V/1V voltage regulator module (VRM) suitable for ultra fast telecom applications with an extended input voltage range. A new split control scheme is used to fasten the transient response to 1A/ns with ±2.5% voltage regulation. Each side of the isolating transformer has its own control loop to eliminate the delay time caused by the opto-coupler. Feed forward phase shift modulation (FFPSM) control is used to precisely regulate the input voltage at the primary side. Self-sustained oscillation controller (SSOC) is used to compensate for the load variations on the secondary side. Design procedure for a 100W VRM prototype is given, based on the Matlab developed analytical guidelines. The performance characteristics are shown to satisfy the design specifications through the simulation results.