PWM Controller IC Simplifies Telecom Distributed DC-DC Converter Designs

摘要

Today's telecom and data communication networks require efficient, high-density dc-dc solutions for converting the -48Vdc bus to low-voltage, high-current outputs. Output voltages range from 1.5Vdc to 5Vdc—with typical outputs ranging from 10A to 30A in half-brick to quarter-brick sizes and smaller. ' One efficient telecom dc-dc converter approach uses the MIC9131 PWM controller IC, a switchmode, resonant reset, forward converter with synchronous rectification that can develop a 3.3V, 20A output from a -48Vdc bus. This topology has a simplified transformer design, and it easily adapts to secondary side synchronous rectification.