LT3800 High Voltage Synchronous Step-Down Controller Demonstration Circuit (DC720)

Overview

Demonstration Circuit 720 (DC720) is a 200kHz high voltage, synchronous current-mode DC/DC step-down converter featuring the LT3800. The circuit operates from an input range of 20V to 55V and delivers a 12V output at up to 6.25A (75W). It includes a soft-start feature to manage output voltage slew rate and reduce current surges. Users can select between Burst Mode, Discontinuous Current Mode, and Continuous Current Mode using jumpers to optimize efficiency at light loads or maintain constant switching frequency. The board supports an optional boost bias circuit for improved efficiency at high input voltages and can be modified for higher output currents or boost converter configurations.

Referenced Parts