25 November 2015
Power Electronics / Power Management
Fairchild 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 features and high efficiency of the device enables manufacturers to improve the reliability and efficiency of the power supplies for server, telecom, industrial, PC and TV applications.
The chip incorporates Fairchild’s innovative Charge Current Control technology, which enables it to utilise current mode control, as opposed to voltage mode control which is traditionally used in other LLC solutions. As the industry’s first 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, adaptive, dual edge secondary-side synchronous rectifier control ensures high reliability and stable SR operation of both load and line transients.
The IC’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 softstart allows a monotonic rising of the output voltage regardless of load condition, while dual edge tracking adaptive dead time control minimises the body diode conduction time, thus maximising efficiency.
The FAN7688 incorporates multiple features to ensure high efficiency in power supply applications – typically 97% for 400 V input and 12 V output applications. Its efficiency is also enhanced through a comprehensive set of protection functions, including overload, over-current, output-short and over-voltage protection.
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