High-Efficiency LED Lighting is Not a High-Cost Proposition…If You Use the Right Approach

Focus:

The conventional approach to powering LED light fixtures or luminaires has typically involved a two-stage approach providing ac-dc power conversion with power factor correction. The solutions based on this approach have suffered from the cost and reliability/lifetime problems. However, LED drivers based on single-stage designs have begun to address these challenges and in so doing are removing key barriers to the commercialization of highly efficient LED lighting. This article presents two examples of single-stage LED drivers based on Power Integrations’ LinkSwitch-PH controller ICs, explaining their operation and how they address performance, cost and lifetime issues. One design is a 15-W flyback LED driver made to be housed a PAR38 enclosure; the other is a 25-W buck-boost LED driver that fits in a T8 tube lamp.

What you’ll learn:

• How to design a low-cost, high-efficiency offline LED driver for LED replacement applications such as PAR38 and T8 lamps
• How to design an offline LED driver without electrolytic capacitors and optoisolators to improve operating life and reliability

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Author & Publication:

Andrew Smith, Engineering Training Manager, Power Integrations (San Jose, CA), Lighting Developer, Nov 15 2012

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