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.
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