As increasingly stringent energy regulations are being implemented globally, achieving higher efficiency in complex AC-DC designs such as desktop PCs, servers, and workstations has become a challenging task. Typically, higher efficiency can be achieved by using a synchronous rectifier (SR) controller on the secondary side, but this approach increases standby power consumption and adds design complexity.

To enable designers to meet these stringent energy regulations, Fairchild Semiconductor (NYSE: FCS) has launched the FAN6224 secondary-side synchronous rectifier (SR) controller, enhancing design flexibility and improving overall system efficiency.

The FAN6224 is the first SR high-side and low-side controller device featuring Fairchild's mWSaver™ technology series. By integrating load-level adjustable Green Mode operation, this device can reduce no-load power consumption by disabling all SR switching operations.

Using linear predictive timing control techniques, this device employs a simple control method that does not require a current sensing circuit, making it insensitive to noise and ideally suited for use in high-side and low-side flyback converters operating in continuous or discontinuous conduction modes (CCM and DCM) and quasi-resonant operation. Additionally, the FAN6224 can operate as a fixed or variable frequency system up to a maximum of 140kHz, providing PWM frequency tracking by sensing secondary-side winding voltage as factors that maximize design flexibility.

Product Features and Benefits:
• Extremely low Green Mode operating current of 300µA
• 12V gate driver clamp
• Comprehensive integrated protection functions: OVP, OTP, SCP
• Open/short circuit protection for LPC pin and RES pin
Packaging and Price (unit price for quantity of 1,000)

Currently Available for Sampling – Delivery 8-12 weeks after order
• FAN6224 is provided in SO 8L NB package at a price of $0.71.
By using the FAN6224 with Fairchild's mWSaver technology PWM controller, excellent standby power consumption and superior system efficiency can be achieved. All devices in the mWSaver technology portfolio incorporate Fairchild's highly efficient process and circuit technology for use in power adapter designs.