onsemi NCP4308DDR2G

The NCP4308 is a synchronous rectifier controller for switch mode power supplies. The controller enables high efficiency designs for flyback, quasi resonant flyback and LLC topologies. Externally adjustable minimum off−time and on−time blanking periods provides flexibility to drive various MOSFET package types and PCB layout. A reliable and noise less operation of the SR system is insured due to the Self Synchronization feature. The NCP4308 also utilizes Kelvin connection of the driver to the MOSFET to achieve high efficiency operation at full load. The precise turn−off threshold, extremely low turn−off delay time and high sink current capability of the driver allow the maximum synchronous rectification MOSFET conduction time. The high accuracy driver and 5 V gate clamp make it ideally suited for directly driving GaN devices.

• Self−Contained Control of Synchronous Rectifier in CCM, DCM and QR for Flyback or LLC Applications
• Precise True Secondary Zero Current Detection
• Rugged Current Sense Pin (up to 150 V)
• Adjustable Minimum ON−Time
• Adjustable Minimum OFF-Time with Ringing Detection
• Adjustable Maximum ON−Time for CCM Controlling of Primary QR Controller
• Improved Robust Self Synchronization Capability
• 8 A / 4 A Peak Current Sink / Source Drive Capability
• Operating Voltage Range up to VCC = 35 V
• GaN Transistor Driving Capability (options A and C)
• Low Startup Current Consumption
• Maximum Operation Frequency up to 1 MHz
• SOIC-8, DFN−8 (4x4) and WDFN8 (2x2) Packages
• These are Pb−Free Devices

• Notebook Adapters
• High Power Density AC/DC Power Supplies (Cell Phone Chargers)
• LCD TVs
• All SMPS with High Efficiency Requirements