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MAXREFDES1227: Small-footprint 24W, 12V DC-DC flyback converter using the MAX17596

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

Overview

Input Type	V _{IN (MIN)} (V)	V _{IN (MAX)} (V)	I_OUT (A)	Single/Multiple Output	V_OUT (V)	P_OUT (W)	Isolated/Non-Isolated	Topology
DC	17	60	2	Single	12	24	Isolated	Fly Back

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 1500V_RMS 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.

Key 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 1500V_RMS
Proven PCB Layout
Fully Assembled and Tested

This board is not available for purchase.

Designed, Built, Tested

This document describes the hardware shown above. It provides a detailed systematic technical guide to designing a DC-DC DCM flyback using Maxim’s MAX17596 current-mode controller. The power supply has been built and tested, details of which follow later in this document.

Design Resources

Design Files

Documentation

Download Full Reference Design

All reference designs on this site are sourced from major semiconductor manufacturers or collected online for learning and research. The copyright belongs to the semiconductor manufacturer or the original author. If you believe that the reference design of this site infringes upon your relevant rights and interests, please send us a rights notice. As a neutral platform service provider, we will take measures to delete the relevant content in accordance with relevant laws after receiving the relevant notice from the rights holder. Please send relevant notifications to email: bbs_service@eeworld.com.cn.

It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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