The market for LED-based lighting continues to grow as government-mandated bans on incandescent bulbs have started in earnest, however challenges remain in finding ways to effectively design the power electronics system to drive the LEDs into the tight form factors. Needs such as triac dimming control, handling varying quality of power line regulation globally, lower cost, higher efficiency, and supporting wide output power ranges only add to the design complexity. Fairchild addresses these needs with the recently released FL7733A and FL7734 primary-side regulated (PSR) LED driver products and 800V SuperFET® II MOSFETS.

A not so trivial challenge remains for an LED lighting designer engineer – putting all of the components together to form a working power electronics system as shown in Figure 1. With these engineers in mind, Fairchild has enhanced the Power Supply WebDesignerTM online design and simulation tools to include these high-performance PSR Flyback/ Buck-Boost LED drivers for both non-dimming and phase-cut dimming lighting applications.


Figure 1. 10W – 100W LED power supply system using buck-boost topology


Leveraging the engineer’s specific design requirements, Power Supply WebDesigner tools provide quick, accurate estimates on design performance and the ability to refine design choices. The tools also allow users to perform detailed simulation analysis (Figure 2) and gain insights on how their design and its hardware prototype will work with a higher degree of confidence, all within minutes. For additional collaboration, users can save their design for future reference or easily share the design with other engineers for review.

Screen Shot 2016-02-19 at 9.55.04 AM

Figure 2. Power Train Simulation

The Power Supply WebDesigner tool provides novice designers a quick and guided design experience, while allowing experienced designers to further customize critical design factors. The tool provides all of the recommended power system components, including Fairchild’s 800V SuperFET II MOSFETs, LED driver ICs and power rectifiers including schematics. Designers can predict critical system Power Factor and THD results by having the tool directly recommend or fine-tune the inductor, EMI filter designs. The ability to visualize major component power loss and system efficiency over different line and load conditions (Figure 3) allows experienced designers to refine component selection to squeeze the last bit of efficiency out of the design.


updated loss analysis

Figure 3. Detailed loss analysis over line and load conditions

Power Supply WebDesigner offers a suite of time-saving LED Driver design tools for designing and optimizing the LED driver power electronics. The online tool experience ranges from device to system analysis and simulation within minutes. Regardless of the experience level, the tools can increase effectiveness, efficiency, and confidence when designing, even the most challenging triac-dimmable LED drivers.

Get started on your design today by visiting the LED lighting design tools page.

Additional resources:
For additional blogs on LED lighting, please read the Fairchild blog. Go to the Fairchild website to learn more about Fairchild’s LED lighting solutions and SuperFET® II MOSFET products.

This post is also available in: Chinese (Simplified)