The NCP4305 is high performance driver tailored to control asynchronous rectification MOSFET in switch mode power supplies.Thanks to its high performance drivers and versatility, it can be used invarious topologies such as DCM or CCM flyback, quasi resonantflyback, forward and half bridge resonant LLC.
The combination of externally adjustable minimum off-time andon-time blanking periods helps to fight the ringing induced by the PCBlayout and other parasitic elements. A reliable and noise less operationof the SR system is insured due to the Self Synchronization feature.The NCP4305 also utilizes Kelvin connection of the driver to theMOSFET to achieve high efficiency operation at full load and utilizesa light load detection architecture to achieve high efficiency at lightload.
The precise turn−off threshold, extremely low turn−off delay timeand high sink current capability of the driver allow the maximumsynchronous rectification MOSFET conduction time and enablesmaximum SMPS efficiency. The high accuracy driver and 5 V gateclamp enables the use of GaN MOSFETs.

• Precise True Secondary Zero Current Detection with Adjustable Threshold
• Typically 20 ns Turn off Delay from Current Sense Input to Driver
• Zero Current Detection Pin Capability up to 200 V
• Optional Ultrafast (7ns) Trigger Input
• Disable Input
• Adjustable Minimum ON Time and Minimum OFF Time
• Self Synchronization
• 8 A Sink, 4 A Source Drive capability
• Light Load Detection with Modulated Gate Drive
• 4.5 V & 9 V UVLO Options and 36 V(Max)