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Fairchild Launches Industry's First LLC Controller with Current Mode Control and Synchronous Rectification for More Efficient and Reliable Power Supplies
[October 05, 2015]

Fairchild Launches Industry's First LLC Controller with Current Mode Control and Synchronous Rectification for More Efficient and Reliable Power Supplies


Fairchild (NASDAQ: FCS), a leading global supplier of high-performance semiconductor solutions, today launched its new FAN7688, an advanced LLC resonant controller with Synchronous Rectification (SR) that provides best-in-class efficiency for isolated DC-DC converters. The unique features and superior efficiency of the FAN7688 enables manufacturers to improve the reliability and efficiency of the power supplies for server, telecom, industrial, PC and TV applications.

The FAN7688 incorporates Fairchild's innovative Charge Current Control Technology, which uniquely enables it to utilize current mode control, as opposed to voltage mode control, which is traditionally used in other LLC solutions. As the industry's first and only LLC resonant controller with current mode control and SR, the FAN7688 allows for tighter and faster output regulation against load transients and also simplifies the control loop, which makes designing it into power supplies easier than traditional LLC resonant controllers. Additionally, the FAN7688's Adaptive Dual Edge Secondary Side Synchronous Rectifier Control ensures high reliability and stable SR operation of both load and line transients.

"Our new FAN7688 is another industry first from Fairchild and an ideal solution for manufacturers requiring offline solutions that improve the efficiency of the power supplies within their products while enabling highly reliable and robust control of secondary and primary MOSFETs," said Gaurang Shah, Senior Vice President, Analog Power Group at Fairchild. "The best-in-class protection features of the FAN7668 are complemented by its outstanding robustness, much of which comes from the direct drive of the secondary side rectification MOSFETs."

The FAN7688's current mode control is a technique based on a charge control providing a better control-to-output transfer function of the power stage simplifying the feedback loop design while allowing true input power limit capability. Closed-loop soft-start allows a monotonic rising of the output voltage regardless of load condition. The dual edge tracking adaptive dead time control minimizes the body diode conduction time, thus maximizing efficiency.

The FAN7688 incorporates multiple features to ensure high efficiency in power supply applications - typically 97 percent for 400V input and 12V output applications. The efficincy of the FAN7688 is also enhanced by its comprehensive set of protection functions, including over-load protection, over-current protection, output-short protection and over-voltage protection.



Availability

The new FAN7688 is available today in distribution and two evaluation boards can also be ordered, the 306W FEBFAN7668 and the 250W FEBFAN7688A, which is recommended for designers who want to evaluate the LLC in detail. Watch the FAN7688 video, read the FAN7688 blog and visit the website for more detailed product information about Fairchild's offline power solutions.


About Fairchild:

Fairchild has a rich history as a pioneer in the semiconductor industry and that pioneering spirit endures today in our vision for making the world a cleaner and smarter place. We specialize in the development and manufacturing of a complete portfolio of low- to high-power solutions and deliver an amazing design experience to the engineers and system architects who build systems for the mobile, industrial, cloud, automotive, lighting, and computing industries. Our foundation is our guiding principles, which recognizes the inseparability of engaged employees and delighted customers, and encourages our employees to simplify, challenge, explore, play, excel, respect, go fast, and be direct. If you use a smart phone, drive a car, own a modern appliance, live and work in comfortable connected buildings, or enjoy film animation, you have experienced Fairchild's Power to Amaze. Please visit us on the web at www.fairchild.com.

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