APPLICATION NOTE 2400

A Compact 36-72V DC Input, 3.3V/10A Output Power Supply


Abstract: A compact power supply that provides a regulated 3.3V at currents up to 10A using the MAX5052A PWM controller is described here. This power supply operates from -36V to -72V and uses synchronous rectification to achieve efficiencies greater than 88% at 10A. It uses a single transistor forward converter with a reset winding and has a maximum duty cycle of 50%.It has input reverse voltage protection, and will regulate to zero load. The isolation voltage is 1500V and it has over-voltage and over-current protection. It can be turned on and off by the remote on/off pin and it has a thermal shutdown feature which protects the supply from excessive temperatures. The unit has hiccup current limit to limit the RMS current during an output short.