NCP4304A Synchronous Rectification Driver onsemi NCP4304A Secondary Side Synchronous Rectification Driver is a full featured controller and driver tailored to control synchronous rectification circuitry in switch mode power supplies. Due to its versatility, this driver from onsemi can be used in various topologies such as flyback, forward and Half Bridge Resonant LLC. The combination of externally adjustable minimum on and off times helps to fight the ringing induced by the PCB layout and other parasitic elements. Therefore, a reliable and noise less operation of the SR system is insured.