FAN6208 − Secondary Synchronous Rectifier Controller for LLC Topology

FAN6208 is a synchronous rectification (SR) controller for isolated LLC or LC resonant converters that can drive two individual SR MOSFETs emulating the behavior of rectifier diodes. FAN6208 measures the SR conduction time of each switching cycle by monitoring the drain-to-source voltage of each SR and determines the optimal timing of the SR gate drive. FAN6208 uses the change of opto-coupler diode current to adaptively shrink the duration of SR gate drive signals during load transients to prevent shoot-through. To improve lightload efficiency, Green-Mode operation is employed, which disables the SR drive signals, minimizing gate drive power consumption at light-load condition.Optimal timing circuits and protection functions are integrated in an 8-pin SOP package, which allows highefficiency power supply design with fewer components.

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Product Status/Pricing/Packaging

Index	Product	Product & Eco Status	*Pricing	Packaging & Packing Info	**Package Marking Convention	Qualification Support	Compliance Certificates
0	FAN6208MY	Full Production Green as of May 2010	$1.09	SO 8L NB Details SO 8L NB Drawing  TAPE REEL	Line 1:$Y (Fairchild logo) &Z (Plant Code) &2 (2-Digit Date Code) &K Line 2:6208 Line 3:MYB	FIT :  1   ESD (CDM) :  2000  V ESD (HBM) :  6000  V Show more... Moisture Sensitivity Level (MSL) :  1   Max Reflow Temp :  260	RoHS IPC1752 RoHS/REACH/JIG RoHS/REACH/JIG

• Fairchild 1,000 piece Budgetary Pricing. *
• If there is no sample button displayed at the top of the page, please contact one of the Fairchild distributors or your local sales office to obtain samples.
• Top mark packaging information for product FAN6208 is available. **

Features

• Specialized SR Controller for LLC or LC Resonant Converters
• Secondary-Side Timing Detection with Timing Estimator
• Gate-Shrink Function to Prevent Shoot-Through During Load and Line Transient
• Green-Mode Function for Higher Efficiency at Light-Load Condition
• Programmable Dead Time between Primary-Side Gate Drive Signal and SR Drive Signal
• Advanced Output-Short / Overload Protection Based on the Feedback Information
• Internal Over-Temperature Protection (OTP)
• V_DD Pin Over-Voltage Protection (OVP)

Applications

Desktop PC Server Workstation Video Game Console

Application Notes

Evaluation Boards

Fairchild offers the following evaluation board(s) for this product.

Evaluation Board	Description
FEBFAN6208_CP433v1	Evaluation Board featuring the FAN6208, Secondary-Side Synchronous Rectifier. This board has a full-load output power of 192W minimum.