Product Overview NCP4304: Secondary Side Controller, Synchronous Rectification, for High Efficiency SMPS Topologies For complete documentation, see the data sheet Product Description The NCP4304A/B is a full featured controller and driver tailored to control synchronous rectification circuitry in switch mode power supplies. Due to its versatility, it 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. The extremely low turn off delay time, high sink current capability of the driver and automatic package parasitic inductance compensation system allow to maximize synchronous rectification MOSFET conduction time that enables further increase of SMPS efficiency. Finally, a wide operating VCC range combined with two versions of driver voltage clamp eases implementation of the SR system in 24 V output applications. Features Benefits • Precise True Secondary Zero Current Detection with Adjustable Threshold • Automatic Parasitic Inductance Compensation • Allows for proper timing of SR MOSFET turn on and turn off • Typically 40 ns Turn off Delay from Current Sense Input to Driver • Zero Current Detection Pin Capability up to 200 V • Optional Ultrafast Trigger Input • Disable Input • Adjustable Minimum ON Time and Minimum OFF Time • 5 A/2.5 A Peak Current Sink/Source Drive Capability • Operating Voltage Range up to 30V Applications • Compensates for the parasitic inducatance effects of TO-220 MOSFETS to optimize conduction time • Maximizes conduction time of the MOSFET to increase efficiency • Allows direct connection of CS input to MOSFET drain in flyback applications • Improves performance for applications working in deep CCM • Enters the IC into a low consumption standby mode • Prevents accidental MOSFET turn on or turn off due to ringing • Fast turn off of MOSFET for optimized conduction period • Allows for direct supply from the power supply output voltage in a wide range of applications End Products • High Power Density AC/DC Power Supplies • Notebook Adapters • Server Power Supplies • ATX Power Supplies Part Electrical Specifications Product NCP4304ADR2G Compliance Status VCC Max (V) Vref Typ (V) ICC Max (A) TA Min (°C) TA Max (°C) Package Type Pb-free Active 30 N/A 0.0066 -40 125 SOIC-8 Active 30 N/A 0.0066 -40 125 DFN-8 Active 30 N/A 0.0062 -40 125 SOIC-8 Active 30 N/A 0.0062 -40 125 DFN-8 Halide free NCP4304AMNTWG Pb-free Halide free NCP4304BDR2G Pb-free Halide free NCP4304BMNTWG Pb-free Halide free Application Diagram For more information please contact your local sales support at www.onsemi.com Created on: 6/30/2016