DACD Solution Simplifies Smart LED Lighting Design: Page 2 of 4

July 12, 2016 //By John Wiggenhorn, Fairchild Semiconductor
DACD Solution Simplifies Smart LED Lighting Design
Smart LED lighting systems in various fields - from home to commercial to public applications – are taking off at great speed. The U.S. market researcher IHS projects over 160 Million smart lighting systems to be sold in commercial applications this year, with a CAGR of over 40 percent through 2018. This is due to their inherent advantages, such as low power consumption, dimmability and choice of color, flexibility in size and easiness of combining to form LED strips. These capabilities are key for creating attractive lighting solutions according to the customers' architectural guidelines and preferences. One frequent problem that industrial lighting designers have when they are developing smart LED solutions is not having the necessary power supply expertise, which was not a key competency before LED lighting took off.
waveform. This impacts the power factor (PF) and total harmonic distortion (THD) performance of those LED lighting systems.

This is a particular problem in those industrial and commercial lighting products that have to meet the accepted guidelines for PF and THD performance. Typical specifications require a PF of 0.9 or greater. THD typically needs to be less than 20 percent. There are currently no standards governing flicker. Most manufacturers and customers accept the US ENERGY STAR recommended spec for calculating the flicker index. It suggests a figure of 0.15 or lower to be optimal since values below 0.15 are considered imperceptible. As a consequence, lighting manufacturers typically aim to achieve or improve on this limit.


Direct AC Driver for Superior Performance

All these problems are now being addressed, as Fairchild, a leading global supplier of high-performance semiconductor solutions, recently introduced its new FL77944 LED Direct AC Drive family of solid-state LED lighting solutions. The FL77944 and the IP provided by Fairchild enable a tunable flicker index below 0.10 while maintaining PF > 0.9 and THD < 20%.  LED lighting manufacturers can use these integrated driver circuits to easily scale power conditions. This will enable them to create smart and scalable LED systems that are smaller, have higher performance and reliability, offer size advantages and a lower component count as well as longer lifetimes compared to the traditional SMPS approach. 

Figure 1. Simplified Block Diagram of the FL77944 LED Driver.

The FL77944 is a cost-effective integrated circuit with everything manufacturers need for smart LED lighting products so they can accelerate time-to-market and focus on differentiating features, rather than spending precious time cobbling together disparate components.


The new Fairchild FL77944 DACD solution offers:


  • Comprehensive dimming capabilities . It enables all the dimming capabilities required for smart lighting products, including phase-cut dimming as well as analog and PWM dimming, which is key for wirelessly connected lighting.


  • Scaling for higher power
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