NCP4305DDR2G

The NCP4305 is high performance driver tailored to control a synchronous rectification MOSFET in switch mode power supplies. Thanks to its high performance drivers and versatility, it can be used in various topologies such as DCM or CCM flyback, quasi resonant flyback, forward and half bridge resonant LLC. The combination of externally adjustable minimum off-time and on-time blanking periods helps to fight the ringing induced by the PCB layout and other parasitic elements. A reliable and noise less operation of the SR system is insured due to the Self Synchronization feature. The NCP4305 also utilizes Kelvin connection of the driver to the MOSFET to achieve high efficiency operation at full load and utilizes a light load detection architecture to achieve high efficiency at light 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 and enables maximum SMPS efficiency. The high accuracy driver and 5 V gate clamp enables the use of GaN FETs.

Applications

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

Key features

• Self−Contained Control of Synchronous Rectifier in CCM, DCM an QR for Flyback, Forward or LLC Applications
• Precise True Secondary Zero Current Detection
• Typically 12 ns Turn off Delay from Current Sense Input to Driver
• Rugged Current Sense Pin (up to 200 V)
• Ultrafast Turn−off Trigger Interface/Disable Input (7.5 ns)
• 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
• Automatic Light−load & Disable Mode
• Adaptive Gate Drive Clamp
• GaN Transistor Driving Capability (options A and C)
• Low Startup and Disable Current Consumption
• Maximum Operation Frequency up to 1 MHz
• SOIC-8 and DFN−8 (4x4) and WDFN8 (2x2) Packages
• These are Pb−Free Devices