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MAXREFDES1227: Miniature 24W, 12V DC-DC Flyback Converter Using MAX17596

MAXREFDES1227

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Description

The MAXREFDES1227 is a miniature 12V output isolated power supply that can deliver up to 2A load current. The design employs the MAX17596 peak-current-mode controller in discontinuous-conduction mode (DCM) flyback topology running at 125kHz. The input voltage range of MAX17596 is 4.5V to 36V; however, an extra bias winding from the transformer is used to power the controller. This allows an input operating voltage of up to 60V for this design.

The transformer provides a galvanic isolation of 1500VRMS between the primary and the secondary. In addition, an optocoupler is used to provide secondary side feedback to the controller for voltage regulation while maintaining isolation. This document also discusses a step-by-step procedure that is used to implement this reference design. Design equations for the calculation of all the design parameters are presented. These equations show how the component values were calculated enabling users to modify this design for their applications.

Features

  • Miniature Design Optimized for Small Size
  • 17V to 60V Input Range
  • Isolated Output of 12V DC at 24W
  • Cycle-by-Cycle Current Limit
  • Resistor Programmable UVLO/OVI Threshold
  • Low-Cost DCM Flyback Design
  • Galvanic Isolation up to 1500VRMS
  • Proven PCB Layout
  • Fully Assembled and Tested

The MAXREFDES1227 is a miniature 12V output isolated power supply that can deliver up to 2A load current. The design employs MAX17596 peak current mode controller in discontinuous conduction mode (DCM) flyback topology running at 125kHz.

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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 17 60 2 - 12 24 Isolated Flyback

Parametrics

Input Type DC
Vin(Min) 17
Vin(Max) 60
Iout(Max) 2
Single/Multiple Output -
Vout(V) 12
Pout(W) 24
Isolated/Non-Isolated Isolated
Topology Flyback

Maxim Devices (1)

Part Number Name Product Family Order Design kits and evaluation modules
MAX17596 Peak-Current-Mode Controllers for Flyback and Boost Regulators Isolated Power Buy Now Design Kits

Maxim Devices (1)

Part Number Product Family
Isolated Power
Peak-Current-Mode Controllers for Flyback and Boost Regulators

Design Files (4)

Title Type Size Date
maxrefdes1227-pcb PDF 715KB 2019-04-03
TTS MAXREFDES Test Results Template_Rev 0_0318 PDF 601KB 2019-04-03
maxrefdes1227-bom PDF 1MB 2019-04-03
maxrefdes1227-schematic PDF 23KB 2019-04-03
Date Type
2019-04-03

maxrefdes1227-pcb

(PDF, 715KB)

2019-04-03

TTS MAXREFDES Test Results Template_Rev 0_0318

(PDF, 601KB)

2019-04-03

maxrefdes1227-bom

(PDF, 1MB)

2019-04-03

maxrefdes1227-schematic

(PDF, 23KB)

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