NCP4304中文资料辅助侧控制器，同步整流，用于高能效 SMPS 拓扑结构数据手册ONSEMI规格书

描述 Description

The NCP4304A/B is a full featured controller and driver tailored to control synchronous rectification circuitry in switch mode power supplies. Due 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.

特性 Features

• Precise True Secondary Zero Current Detection with Adjustable Threshold
• Allows for proper timing of SR MOSFET turn on and turn off
• Automatic Parasitic Inductance Compensation
• Compensates for the parasitic inducatance effects of TO-220 MOSFETS to optimize conduction time
• Typically 40 ns Turn off Delay from Current Sense Input to Driver
• Maximizes conduction time of the MOSFET to increase efficiency
• Zero Current Detection Pin Capability up to 200 V
• Allows direct connection of CS input to MOSFET drain in flyback applications
• Optional Ultrafast Trigger Input
• Improves performance for applications working in deep CCM
• Disable Input
• Enters the IC into a low consumption standby mode
• Adjustable Minimum ON Time and Minimum OFF Time
• Prevents accidental MOSFET turn on or turn off due to ringing
• 5 A/2.5 A Peak Current Sink/Source Drive Capability
• Fast turn off of MOSFET for optimized conduction period
• Operating Voltage Range up to 30V
• Allows for direct supply from the power supply output voltage in a wide range of applications

应用 Application

• High Power Density AC/DC Power Supplies
• Notebook Adapters
• Server Power Supplies
• ATX Power Supplies