General Description

The MAX5051 is a clamped, two-switch power-supply controller IC. This device can be used both in forward or flyback configurations with input voltage ranges from 11V to 76V. It provides comprehensive protection mechanisms against possible faults, resulting in very high reliability power supplies. When used in conjunction with secondary side synchronous rectification, power-supply efficiencies can easily reach 92 for a +3.3V output power supply operated from a 48V bus. The integrated high- and low side gate drivers provide more than 2A of peak gate-drive current to two external N-channel MOSFETs. Low startup current reduces the power loss across the bootstrap resistor. A feed-forward voltagemode topology provides excellent line rejection while avoiding the pitfalls of traditional current-mode control.

Features

● Wide Input Voltage Range, 11V to 76V

● Voltage Mode with Input Voltage Feed-Forward

● Ripple-Phased Parallel Topology for High Current/ Power Output

● 2A Integrated High- and Low-Side MOSFET Drivers

● SYNCIN And SYNCOUT Pins Enable 180° Out-OfPhase Operation

● Programmable Brownout and Bootstrap UVLOs

● High-Side Driver Bootstrap Capacitor Precharge Driver

● Low Current-Limit Threshold for High Efficiency

● Programmable Switching Frequency

● Reference Voltage Soft-Start for Startup Without Overshoots

● Startup Synchronization with Multiple Paralleled Primaries

● Programmable Integrating Current-Limit Fault Protection

● Look-Ahead PWM Signal for Secondary-Side Synchronous Rectifier Drivers

● Look-Ahead Drivers for Either A High-Speed Optocoupler or Pulse Transformer

● Wide -40°C to +125°C Operating Range

● Thermally Enhanced 28-Pin TSSOP Package

Applications

● High-Effciency, Isolated Telecom/Datacom Power Supplies

● 48V and 12V Server Power Supplies

● 48V Power-Supply Modules

● Industrial Power Supplies