Is Now Part of To learn more about ON Semiconductor, please visit our website at www.onsemi.com ON Semiconductor and the ON Semiconductor logo are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductors product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. Typical parameters which may be provided in ON Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including Typicals must be validated for each customer application by customers technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.FAN6208 Secondary-Side Synchronous Rectifier Controller for LLC Topology October 2014 FAN6208 Secondary-Side Synchronous Rectifier Controller for LLC Topology Features Description Specialized SR Controller for LLC or LC Resonant FAN6208 is a synchronous rectification (SR) controller Converters for isolated LLC or LC resonant converters that can drive two individual SR MOSFETs emulating the Secondary-Side Timing Detection with Timing behavior of rectifier diodes. FAN6208 measures the SR Estimator conduction time of each switching cycle by monitoring Gate-Shrink Function to Prevent Shoot-Through the drain-to-source voltage of each SR and determines During Load and Line Transient the optimal timing of the SR gate drive. FAN6208 uses the change of opto-coupler diode current to adaptively Green-Mode Function for Higher Efficiency at Light- shrink the duration of SR gate drive signals during load Load Condition transients to prevent shoot-through. To improve light- Programmable Dead Time between Primary-Side load efficiency, Green-Mode operation is employed, Gate Drive Signal and SR Drive Signal which disables the SR drive signals, minimizing gate drive power consumption at light-load condition. Advanced Output-Short / Overload Protection Based on the Feedback Information Optimal timing circuits and protection functions are integrated in an 8-pin SOP package, which allows high- Internal Over-Temperature Protection (OTP) efficiency power supply design with fewer components. V Pin Over-Voltage Protection (OVP) DD Related Resources Applications FAN6208 Product Folder LCD TV PC Power Open-Frame SMPS Ordering Information Part Number Operating Temperature Range Package Packing Method FAN6208MY -40C to +105C 8-Pin Small Outline Package (SOP) Tape & Reel 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN6208 Rev. 1.0.5