General Description

The MAX5094A/B/C/D/MAX5095A/B/C BiCMOS, high performance, current-mode PWM controllers have all the features required for wide input-voltage range isolated/nonisolated power supplies. These controllers are used for low- and high-power universal input voltage and telecom power supplies.

The MAX5094/MAX5095 contain a fast comparator with only 60ns typical delay from current sense to the output for overcurrent protection. The MAX5094 has an integrated error amplifier with the output at COMP. Softstart is achieved by controlling the COMP voltage rise using external components

Features

♦ Pin-for-Pin Replacement for UCC28C43

   (MAX5094A) and UCC28C45 (MAX5094B)

♦ 2A Drive Source and 1A Sink Capability

♦ Up to 1MHz Switching Frequency Operation

♦ Bidirectional Frequency Synchronization

   (MAX5095A/MAX5095B)

♦ Advanced Output Drive for Secondary-Side

   Synchronous Rectification (MAX5095C)

♦ Fast 60ns Cycle-by-Cycle Current Limit

♦ Trimmed Oscillator Capacitor Discharge Current

   Sets Maximum Duty Cycle Accurately

♦ Accurate ±5 Start Voltage with 0.8V Hysteresis

♦ Low 32µA Startup Current

♦ 5V Regulator Output (REF) with 20mA Capability

♦ Versions with 0.3V Current-Sense Threshold

♦ Overtemperature Shutdown

Applications

   Universal Input AC/DC Power Supplies

   Isolated Telecom Power Supplies

   Isolated Power-Supply Modules

   Networking Systems

   Computer Systems/Servers

   Industrial Power Conversion

   Isolated Keep-Alive Circuits