General Description

The MAX5019/MAX5020 integrate all the building blocks necessary for implementing DC-DC fixed-frequency power supplies. Either primary- or secondary side regulation may be used to implement isolated or nonisolated power supplies. These devices are current mode controllers with an integrated high-voltage startup circuit suitable for telecom/industrial voltage range power supplies. Current-mode control with leading edge blanking simplifies control-loop design and internal ramp compensation circuitry stabilizes the current loop when operating at duty cycles above 50 (MAX5019).

Features

♦ Wide Input Range: (18V to 110V) or (13V to 36V)

♦ Isolated (without optocoupler) or Nonisolated Power Supply

♦ Current-Mode Control

♦ Leading-Edge Blanking

♦ Internally Trimmed 275kHz ±10 Oscillator

♦ Low External Component Count

♦ Soft-Start

♦ High-Voltage Startup Circuit

♦ Pulse-by-Pulse Current Limiting

♦ Thermal Shutdown

♦ SO-8 Package

Applications

   Telecom Power Supplies

   Industrial Power Supplies

   Networking Power Supplies

   Isolated Power Supplies