MAXREFDES1256
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.
Designed, Built, Tested
Board pictured here has been fully assembled and tested. Not available for sale.
Schematic
PCB Layout
BOM
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)
| Title
|
Type
|
Size
|
Date
|
|---|---|---|---|
 MAXREFDES1256 - 49W DC-DC Flyback Converter Using MAX17597 |
541KB | 2020-08-06 |
| Date
|
Type
|
|---|---|
| 2020-08-06 |
(PDF, 541KB) |
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