Forward-Converter Design Leverages Clever Magnetics Part 1

by Carl Walding, Field Applications Engineer, Fairchild Semiconductor, Chicago, Power Electronics Technology, Jul 01 2007

Focus:
Originally developed as a power supply solution for a set-top box application, a dual-output 130-W forward converter uses synchronous rectification and a coupled output inductor to achieve high efficiency and low cost. The design, which is built around the FS7M0880 current-mode PWM controller IC, is described in detail. Part 1 discusses design requirements, why the forward topology was selected, choice of transformer-reset scheme, input-rectifier filter design, primary-side calculations, and transformer design.

What you’ll learn:

• How to design a dual-output forward converter with high efficiency and low cost for consumer applications
• How to improve dynamic cross regulation in a dual-output forward converter

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