Synchronous rectification controller is compatible to flyback and forward topologies

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Using a proprietary, innovative linear prediction timing-control technique, not limited to the RDS(ON) of the SR MOSFET, the FAN6204 is suitable for fixed frequency or quasi-resonant (QR) flyback converters and discontinuous or continuous conduction mode (DCM and CCM) operation. This technique includes a simple control method without current-sense circuitry, which provides better noise immunity.

With PWM frequency tracking and secondary-side winding voltage detection, the device can operate in both fixed- and variable-frequency systems, making it adaptable to flyback and forward free-wheeling topologies.

The FAN6204 also features an ultra-low green mode operating current (1.1 mA typical). This internal green mode provides lower no-load power consumption and higher light-load efficiency. In green mode, the SR MOSFET stops switching and the controller stops major internal IC block operations to further reduce the operating current. In light-load conditions, power consumption is maintained at minimum levels.

The FAN6204 is ideal for adapters and chargers, AIO computers, LCD TVs and monitors, LED street lights, notebook adapters (Slim Pack), as well as DVD players and set-top boxes.

Other features of the FAN6204 include an ultra-low V DD operating voltage (5 V-28.5 V), V DD pin over-voltage protection (OVP) and a 12 V (typical) gate drive clamp. The device is available in an 8-pin SOP package.

Availability and Pricing

Samples of the FAN6204 are available now.  The devices are priced $0.57 in 1,000 quantity pieces.

More information about the FAN6204 synchronous rectification controller at

Visit Fairchild Semiconductor at


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