Simple, Yet Versatile Flybacks Present Low-Cost Driver Solutions For LED Lighting

by Peter B. Green, International Rectifier, El Segundo, Calif., How2Power Today, Jan 18 2013

Focus:
Most LED light fixtures continue to drive the LEDs with current-regulated dc by means of an LED driver circuit consisting of an ac-dc switching converter. The simple, single-stage flyback converter is a basic platform used in many LED drivers because of its simplicity and low component count. It meets many of the common application requirements for isolation, input voltage range, power factor, THD and operating life. And with the addition of a few components, the LED driver becomes dimmable using an analog control voltage. This article describes two isolated LED driver designs based on the one-stage flyback converter. The first design is non-dimmable; the second is dimmable. Both designs are built around the IRS2500 PFC controller IC. The operation of these LED driver designs, their typical performance capabilities and ranges of operation, and important design considerations are explained.

What you’ll learn:

• How to build a low-cost, isolated offline driver circuit with or without dimmability for powering LED light fixtures
• How to build one-stage flyback converters based on the IRS2500 PFC controller IC for driving LEDs in LED lighting applications

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