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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.

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

Current, Output	2.5 (Source), 5 (Sink) A
Dimensions	5.00 x 4.00 x 1.50 mm
Fall Time	50 ns
Frequency, Switching	500 kHz
Height	0.059" (1.5mm)
Length	0.196" (5mm)
Mounting Type	Surface Mount
Number of Pins	8
Package Type	SOIC
Primary Type	Controllers
Supply Voltage	9.5-30 V
Temperature, Operating	-40 to 125 °C
Temperature, Operating, Maximum	+160 °C
Temperature, Operating, Range	Maximum of +160 °C
Time, Rise	120 ns
Topology	Flyback, Forward
Type	Switchmode
Voltage, Operating	10.4 to 28 V
Width	0.157" (4mm)
关键词

Current, Output 2.5 (Source), 5 (Sink) A  ON Semiconductor Current, Output 2.5 (Source), 5 (Sink) A  PWM Current Mode Controllers Current, Output 2.5 (Source), 5 (Sink) A  ON Semiconductor PWM Current Mode Controllers Current, Output 2.5 (Source), 5 (Sink) A   Dimensions 5.00 x 4.00 x 1.50 mm  ON Semiconductor Dimensions 5.00 x 4.00 x 1.50 mm  PWM Current Mode Controllers Dimensions 5.00 x 4.00 x 1.50 mm  ON Semiconductor PWM Current Mode Controllers Dimensions 5.00 x 4.00 x 1.50 mm   Fall Time 50 ns  ON Semiconductor Fall Time 50 ns  PWM Current Mode Controllers Fall Time 50 ns  ON Semiconductor PWM Current Mode Controllers Fall Time 50 ns   Frequency, Switching 500 kHz  ON Semiconductor Frequency, Switching 500 kHz  PWM Current Mode Controllers Frequency, Switching 500 kHz  ON Semiconductor PWM Current Mode Controllers Frequency, Switching 500 kHz   Height 0.059" (1.5mm)  ON Semiconductor Height 0.059" (1.5mm)  PWM Current Mode Controllers Height 0.059" (1.5mm)  ON Semiconductor PWM Current Mode Controllers Height 0.059" (1.5mm)   Length 0.196" (5mm)  ON Semiconductor Length 0.196" (5mm)  PWM Current Mode Controllers Length 0.196" (5mm)  ON Semiconductor PWM Current Mode Controllers Length 0.196" (5mm)   Mounting Type Surface Mount  ON Semiconductor Mounting Type Surface Mount  PWM Current Mode Controllers Mounting Type Surface Mount  ON Semiconductor PWM Current Mode Controllers Mounting Type Surface Mount   Number of Pins 8  ON Semiconductor Number of Pins 8  PWM Current Mode Controllers Number of Pins 8  ON Semiconductor PWM Current Mode Controllers Number of Pins 8   Package Type SOIC  ON Semiconductor Package Type SOIC  PWM Current Mode Controllers Package Type SOIC  ON Semiconductor PWM Current Mode Controllers Package Type SOIC   Primary Type Controllers  ON Semiconductor Primary Type Controllers  PWM Current Mode Controllers Primary Type Controllers  ON Semiconductor PWM Current Mode Controllers Primary Type Controllers   Supply Voltage 9.5-30 V  ON Semiconductor Supply Voltage 9.5-30 V  PWM Current Mode Controllers Supply Voltage 9.5-30 V  ON Semiconductor PWM Current Mode Controllers Supply Voltage 9.5-30 V   Temperature, Operating -40 to 125 °C  ON Semiconductor Temperature, Operating -40 to 125 °C  PWM Current Mode Controllers Temperature, Operating -40 to 125 °C  ON Semiconductor PWM Current Mode Controllers Temperature, Operating -40 to 125 °C   Temperature, Operating, Maximum +160 °C  ON Semiconductor Temperature, Operating, Maximum +160 °C  PWM Current Mode Controllers Temperature, Operating, Maximum +160 °C  ON Semiconductor PWM Current Mode Controllers Temperature, Operating, Maximum +160 °C   Temperature, Operating, Range Maximum of +160 °C  ON Semiconductor Temperature, Operating, Range Maximum of +160 °C  PWM Current Mode Controllers Temperature, Operating, Range Maximum of +160 °C  ON Semiconductor PWM Current Mode Controllers Temperature, Operating, Range Maximum of +160 °C   Time, Rise 120 ns  ON Semiconductor Time, Rise 120 ns  PWM Current Mode Controllers Time, Rise 120 ns  ON Semiconductor PWM Current Mode Controllers Time, Rise 120 ns   Topology Flyback, Forward  ON Semiconductor Topology Flyback, Forward  PWM Current Mode Controllers Topology Flyback, Forward  ON Semiconductor PWM Current Mode Controllers Topology Flyback, Forward   Type Switchmode  ON Semiconductor Type Switchmode  PWM Current Mode Controllers Type Switchmode  ON Semiconductor PWM Current Mode Controllers Type Switchmode   Voltage, Operating 10.4 to 28 V  ON Semiconductor Voltage, Operating 10.4 to 28 V  PWM Current Mode Controllers Voltage, Operating 10.4 to 28 V  ON Semiconductor PWM Current Mode Controllers Voltage, Operating 10.4 to 28 V   Width 0.157" (4mm)  ON Semiconductor Width 0.157" (4mm)  PWM Current Mode Controllers Width 0.157" (4mm)  ON Semiconductor PWM Current Mode Controllers Width 0.157" (4mm)