General Description

The MAX5069 is a high-frequency, current-mode, pulse-width modulation (PWM) controller (with dual MOSFET drivers) that integrates all the building blocks necessary for implementing AC-DC or DC-DC fixed-frequency power supplies. Isolated or nonisolated push-pull and half/full-bridge power supplies are easily constructed using either primary- or secondary-side regulation. Current-mode control with leading-edge blanking simplifies control-loop design and a programmable internal slope-compensation circuit stabilizes the current loop when operating at duty cycles above 50.

An input undervoltage lockout (UVLO) programs the input-supply startup voltage and ensures proper operation during brownout conditions.

Features

♦ Current-Mode Control with 47µA (typ) Startup Current

♦ Oscillator Frequency Programmable to 2.5MHz

♦ Resistor-Programmable ±4.5 Accurate Switching Frequency

♦ Dual Gate-Drive Output for Half/Full-Bridge or Push-Pull Applications

♦ Rectified 85VAC to 265VAC, or 36VDC to 72VDC Input (MAX5069A/B)

♦ Input Directly Driven from 10.8V to 24V (MAX5069C/D)

♦ Programmable Dead Time and Slope Compensation

♦ Programmable Startup Voltage (UVLO)

♦ Programmable UVLO Hysteresis (MAX5069B/C)

♦ Frequency Synchronization Input (MAX5069A/D)

♦ -40°C to +125°C Automotive Temperature Range

♦ 16-Pin Thermally Enhanced TSSOP-EP Package

Applications

   Universal-Input AC Power Supplies

   Isolated Telecom Power Supplies

   Networking System Power Supplies

   Server Power Supplies

   Industrial Power Conversion