NCP4318ALCDR2G

NCP4318 is an advanced synchronous rectification (SR) controller for LLC resonant converter with minimum external components. It has two gate driver stages for driving the SR MOSFETs which are rectifying the outputs of the secondary transformer windings. The two gate driver stages have their own Drain and Source sensing inputs and operate independently of each other. The advanced adaptive dead time control compensates a 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 – NCP4318AXX, NCP4318BXX.

Applications

• High Power Density Adapters
• Large Screen LED−TV and OLED−TV Power Supplies
• High Efficiency Desktop and Server Power Supplies
• Networking and Telecom Power Supplies
• High Power LED Lighting

Key features

• Mixed Mode SR Turn−off Control
• Anti Shoot−through Control for Reliable SR Operation
• Separate 200 V Rated Sense Pins for the Drain and Dedicated Source Sense 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 Control (10 V,6 V)
• Low Operating Current (100 μA) in Green Mode
• Soft Start for 512 Switching Cycle with 0 V/6 V Gate Output Voltage
• Very Fast Turn−on and Turn−off Delay Time (30 ns/30 ns)
• Large 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 kHz to 500 kHz)
• SOIC−8 Package
• These Devices are Pb−Free and are RoHS Compliant