The NCP4307 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 and forward.

Internal minimum off?time and on?time blanking periods help to

fight the ringing induced by the PCB layout and other parasitic

elements. A reliable and noise less operation of the SR system is

ensured due to the Self Synchronization feature. The NCP4307 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.

Self?supply capability allows to use NCP4307 in high side

configuration and/or in low output voltage SMPS without auxiliary

winding or other power source.

特性 Features

? Self?Contained Control of Synchronous Rectifier in CCM, DCM and

QR for Flyback Applications

? Precise True Secondary Zero Current Detection

? Typically 15 ns Turn off Delay from Current Sense Input to Driver

? Rugged Current Sense Pin (up to 200 V)

? Self?Supply Capability in Case of High Side Operation or Low

VOUT

? Ultrafast Turn?off Trigger Interface/Disable Input (10.5 ns)

? Internal Minimum ON?Time With Reverse Current Protection

? Internal Minimum OFF?Time with Ringing Detection

? Improved Robust Self Synchronization Capability

? 7 A / 2 A Peak Current Sink / Source Drive Capability

? Operating Voltage Range up to VCC = 35 V

? Automatic Light?Load Disable Mode

? High Side Operation Capability without External Components or

Auxiliary Winding

? Two VCC Pins Option Allows to Optimize Power Consumption in

Wide VOUT Range Applications

? Low Startup and Disable Current Consumption

? TSOP6 Package

? These are Pb?Free Devices

Typical Applications

? Notebook Adapters

? High Power Density AC/DC Power Supplies

(Cell Phone Chargers)

? LCD TVs

? All SMPS with High Efficiency

Requirements