The NCP4303A/B is a full featured controller and driver tailored to
control synchronous rectification circuitry in switch mode power
supplies. Thanks 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
• Self-Contained Control of Synchronous Rectifier in CCM, DCM, and
QR Flyback Applications
• Precise True Secondary Zero Current Detection with Adjustable
Threshold
• Automatic Parasitic Inductance Compensation Input
• Typically 40 ns Turn off Delay from Current Sense Input to Driver
• Zero Current Detection Pin Capability up to 200 V
• Optional Ultrafast Trigger Interface for Further Improved
Performance in Applications that Work in Deep CCM
• Disable Input to Enter Standby or Low Consumption Mode
• Adjustable Minimum On Time Independent of VCC Level
• Adjustable Minimum Off Time Independent of VCC Level
• 5 A/2.5 A Peak Current Sink/Source Drive Capability
• Operating Voltage Range up to 30 V
• Gate Drive Clamp of Either 12 V (NCP4303A) or 6 V (NCP4303B)
• Low Startup and Standby Current Consumption
• Maximum Frequency of Operation up to 500 kHz
• SOIC−8 Package
• These are Pb-Free Devices
Typical Applications
• Notebook Adapters
• High Power Density AC/DC Power Supplies
• Gaming Consoles
• All SMPS with High Efficiency Requirements