System Board 7030

MAXREFDES1218: 24V, 3A Average Current, 4A Peak Current Active Clamp Forward DC-DC Converter Using the MAX17599

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Input Type VIN (MIN)
Isolated/Non-Isolated Topology
DC 18 36 4 Single 24 96 Isolated Forward

The MAXREFDES1218 is an active-clamp forward power supply that delivers up to 4A at 24V from a 18V to 36V supply voltage. It is designed for industrial equipment that needs high power isolated power supply. The typical application of the MAXREFDES1218 is an IO-Link® application that needs a 24V isolated voltage from an industrial 24V supply voltage.

The MAXREFDES1218 illustrates techniques using the active-clamp forward controller to generate isolated voltages. This document explains how the MAX17599 activeclamp forward controller can be used to generate 24V isolated voltage from 18V to 36V input voltage. An overview of the design specification is shown above.

MAXREFDES1218 Board Enlarge+

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Designed, Built, Tested

This application note describes the hardware shown above. It provides a detailed systematic technical guide to design an active-clamp forward DC-DC converter (ACFC) using the Maxim® MAX17599 current mode controller. The power supply has been built and tested, details of which follow in this document.

Design Resources


Low-IQ Wide-Input-Range Active-Clamp Current-Mode PWM Controllers

  • Active Clamp, Peak Current-Mode Forward PWM Controller
  • 20µA Startup Current in UVLO
  • 4.5V to 36V Input-Supply Operating Range (MAX17599)