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Applying SG6203 to control a synchronous rectifier of a flyback power supply.

Posted: 30 Jun 2008 ?? ?Print Version ?Bookmark and Share

Keywords:SG6203? synchronous rectifier controller? flyback converter?

This application note describes a detailed design strategy for a high-efficiency compact flyback converter. Design considerations and mathematical equations are presented. A 12V, 120W evaluation board is built to evaluate the performance improvement by the SG6203 synchronous rectifier controller for flyback converter.

Generally, the conduction loss of the output diode is the dominant loss component in low output voltage power supplies. This loss can be reduced by using a low on resistance MOSFET. Improved efficiency can be obtained and a smaller heat sink can be used.

The SG6203 is designed to control and drive the synchronous rectifier for the flyback converter. The synchronous signal of the primary switch is obtained by a single diode connected between the transformer secondary winding and the SG6203. Using the SG6203, no additional transformer winding is required and the circuit complexity can be minimized.

View the PDF document for more information.

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