Top

MAXREFDES1256: 49W DC-DC Flyback Converter Using MAX17597

MAXREFDES1256

Reference Design Disclaimer See the  Important Notice and Disclaimer  covering reference designs and other Maxim resources.

Reference Guide

Description

The MAXREFDES1256 is an isolated power supply capable of delivering 7V at up to 7A load current. High efficiencies are achieved by using the MAX17606 MOSFET driver on the secondary side for synchronous rectification. The input voltage range of the MAXREFDES1256 is 9V to 36V DC.

This design uses the MAX17597 peak-current-mode controller in the discontinuous-conduction mode (DCM) in a flyback topology at 100kHz.

The transformer provides a galvanic isolation of 1425VDC between the primary and secondary. Also, an optocoupler provides secondary side feedback to the controller for voltage regulation while maintaining isolation. This document also discusses a step-by-step procedure to implement this reference design and presents design equations to calculate all the design parameters. These equations show how to calculate the component values to modify this design for applications.

Features

  • Input voltage range of 9V to 36V
  • Synchronous rectification on the secondary side
  • Isolated output of 7V at 49W
  • Cycle-by-cycle current limit
  • Resistor programmable UVLO/OVI threshold
  • Galvanic isolation up to 1425V DC
  • Proven PCB layout
  • Fully assembled and tested

The MAXREFDES1256 is an isolated power supply capable of delivering 7V at up to 7A load current.

Icon

Designed, Built, Tested

Board pictured here has been fully assembled and tested. Not available for sale.

 

Schematic

PCB Layout

Test Results

Parametrics

Input Type Vin(Min) Vin(Max) Iout(Max) Single/Multiple Output Vout(V) Pout(W) Isolated/Non-Isolated Topology
DC 9 36 7 - 7 49 Isolated Flyback

Parametrics

Input Type DC
Vin(Min) 9
Vin(Max) 36
Iout(Max) 7
Single/Multiple Output -
Vout(V) 7
Pout(W) 49
Isolated/Non-Isolated Isolated
Topology Flyback

Maxim Devices (2)

Part Number Name Product Family Order Design kits and evaluation modules
MAX17597 Peak-Current-Mode Controllers for Flyback and Boost Regulators Isolated Power Buy Now Design Kits
MAX17606 Secondary-Side Synchronous MOSFET Driver for Flyback Converters Isolated Power Buy Now Design Kits

Maxim Devices (2)

Part Number Product Family
Isolated Power
Peak-Current-Mode Controllers for Flyback and Boost Regulators
Isolated Power
Secondary-Side Synchronous MOSFET Driver for Flyback Converters

Design Files (1)

MAXREFDES1256 Related Videos

View All Videos