Analog Devices MAX5069 Product Info

• 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/E)
• Programmable Dead Time and Slope Compensation
• Programmable Startup Voltage (UVLO)
• Programmable UVLO Hysteresis (MAX5069B/C/E)
• Frequency Synchronization Input (MAX5069A/D)
• -40°C to +125°C Automotive Temperature Range
• 16-Pin Thermally Enhanced TSSOP-EP Package

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 pushpull 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.

A single external resistor programs the oscillator frequency from 50kHz to 2.5MHz. The MAX5069A/D provide a SYNC input for synchronization to an external clock. The maximum FET-driver duty cycle for the MAX5069 is 50%. Programmable dead time allows additional flexibility in optimizing magnetic design and overcoming parasitic effects. Programmable hiccup current limit provides additional protection under severe faults.

The MAX5069 is specified over the -40°C to +125°C automotive temperature range and is available in a 16-pin thermally enhanced TSSOP-EP package. Refer to the MAX5068 data sheet for single FET-driver applications.

Warning: The MAX5069 is designed to work with high voltages. Exercise caution.

Applications

• Industrial Power Conversion
• Isolated Telecom Power Supplies
• Networking System Power Supplies
• Server Power Supplies
• Universal-Input AC Power Supplies