A Compact, Isolated Power Supply, 48V to 3.3V at 7A

By: Suresh Hariharan

Abstract: This application notes describes a compact isolated switch-mode power supply that is capable of providing a 7A 3.3V output from a 40VDC–60VDC input at an efficiency of 83%–90%. The converter employs a MAX5052A current-mode PWM controller with all of the circuitry required to provide synchronous rectification, over-current and short-circuit protection, remote sense, and primary-secondary isolation of 1500VDC. The total volume occupied is only 1.02 cubic inch. A materials list and suggested layout are provided.