Designing Single-Switch Forward Converters

by Suresh Hariharan, Senior Corporate Applications Engineer, and David Schie, Director of IC Design, Maxim Integrated Products Inc., Sunnyvale, Calif., Power Electronics Technology, Oct 01 2005

Focus:
The single-transistor resonant-reset forward converter eliminates the transformer reset winding and a diode found in the conventional forward converter, which reduces cost by simplifying the transformer. Because this converter allows duty cycles greater than 50%, it is suitable for use in dc-dc converters with wide input and output voltage ranges. In addition, its sinusoidal reset voltage reduces EMI. A design example is presented, but you'll find more details on this design in the Maxim Application Note, which is available at www.maxim-ic.com/appnotes.cfm/an_pk/3983 or http://www.eetasia.com/ARTICLES/2007AUG/PDF/EEOL_2007AUG06_POW_ACC_AN.pdf?SOURCES=DOWNLOAD .

What you’ll learn:

• How to understand operation of the single-transistor resonant-reset forward converter

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