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Flyback converter design using TL494

Posted: 12 Nov 2014     Print Version  Bookmark and Share

Keywords:TL494  PWM  EMI  flyback converter  over-voltage protections 

The TL494 is one of the earliest pulse-width-modulation (PWM) controllers used in switched mode power supplies. It incorporates all the functions required in the construction of a PWM control circuit on a single chip. Designed primarily for power-supply control, this device offers the flexibility to tailor the power-supply control circuitry to a specific application. This application report discusses building a multiple-output lowcost isolated flyback converter with the TL494. Component selection and magnetics design is also shown. Before current mode control was successfully implemented, the TL494 PWM mode ensured low EMI and noise operation due to its trailing edge modulation technique. The power supply is designed for +5-, +15-, and +15-V outputs. It is self-contained with over-current and over-voltage protections, and the PI controller is designed to limit the highest power output. Each stage of the flyback converter design and component selection is explained. A MathCAD file is available along with this document, which helps in design calculation.

View the PDF document for more information.

Originally published by Texas Instruments Inc. at as "Isolated Multiple Output Flyback Converter Design Using TL494".

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