NCP4318

Advanced Synchronous Rectifier Controller for LLC Resonant Converter NCP4318 NCP4318 is an advanced synchronous rectification (SR) controller for LLC resonant converter with minimum external components. It has two gate drivers for driving the SR MOSFETs rectifying the outputs of the secondary transformer windings. The two gate drivers have their own drain and source sensing pins and operate independently of each other. The advanced adaptive dead time control compensates the voltage across parasitic inductance to minimize the body diode conduction and maximize the system efficiency. The advanced turn−off control algorithm allows stable SR operation over entire load range. NCP4318 has two versions of pin assignment – NCP4318A, NCP4318B, and two types of package – SOIC−8 and SOIC−8 EP. Features Mixed Mode SR Turn−off Control Anti Shoot−through Control for Reliable SR Operation 200 V−rated Drain Sensing and Dedicated Source Sensing Pins Advanced Adaptive Dead Time Control SR Current Inversion Detection Adaptive Minimum Turn−on Time for Noise Immunity SR Conduction Time Increase Rate Limitation Multi−level Turn−off Threshold Voltage Adaptive Gate Voltage (10 V, 6 V) Low Operating Current (100 mA) in Green Mode Soft Start with 0 V / 6 V Gate Output Voltage Short Turn−on and Turn−off Delay Time (30 ns / 30 ns) High Gate Sourcing and Sinking Current (1.5 A / 4.5 A) Wide Operating Supply Voltage Range from 6.5 V to 35 V Wide Operating Frequency Range (22 ...