Date: 29/11/2012

Secondary-side synchronous rectifier controller from Fairchild Semiconductor

Fairchild Semiconductor has developed the FAN6224 secondary-side synchronous rectifier (SR) controller to provide design flexibility and improve overall system efficiency.

The FAN6224 is the first SR high- and low-side controller device in Fairchild’s mWSaver technology series. Equipped with an internal, adjustable load-level Green Mode operation, the device stops all SR switching operation and provides lower no-load power consumption.

Utilizing a linear-predict timing-control technique, the device employs a simple control method without current-sense circuitry for noise immunity, making it ideally suited for high- and low-side flyback converters in continuous or discontinuous conduction mode (CCM and DCM) and quasi-resonant (QR) systems. For maximum design flexibility, the FAN6224 provides PWM frequency tracking and secondary-side winding voltage and is able to operate in both fixed- and variable-frequency systems up to 140kHz.

Features and Benefits:
300µA ultra-low Green Mode operating current
12V gate driver clamp
Integration of rich protections: OVP, OTP, SCP
Open/short protection of LPC-pin and RES-pin

Samples available upon request - Delivery 8-12 weeks ARO
Available in a SO 8L NB package the FAN6224 is priced at $.71