48V to 12V isolated resonant converter with digital controller

Abstract

Growth of electricity consumption for data center increases rapidly as computation continues to move into the cloud computing. Energy management has become a key issue for the next generation of data center. 48V to 12V step-down isolated converters are often required in server, telecom and automotive applications. Using resonant topology such as LLC realizes ZVS turn-on for all switches over the entire load range using magnetizing current and can achieve high level of efficiency [1], [2]. In this paper the control system and application of an Isolated dc-dc resonant converter is proposed for a conversion from 48V to 12V. The controller IC has been implemented in 0.16um lithography together with a DPWM with 195ps resolution and 40Ms/s ADC 7 bits pipeline converter. Experimental results of a 45A, 12V provided to show the effectiveness of the discussed system.