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NCP4304B fiches techniques PDF

ON Semiconductor - Secondary Side Synchronous Rectification Driver

Numéro de référence NCP4304B
Description Secondary Side Synchronous Rectification Driver
Fabricant ON Semiconductor 
Logo ON Semiconductor 





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NCP4304B fiche technique
NCP4304A, NCP4304B
Secondary Side
Synchronous Rectification
Driver for High Efficiency
SMPS Topologies
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
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 (NCP4304A) or 6 V (NCP4304B)
Low Startup and Standby Current Consumption
Maximum Frequency of Operation up to 500 kHz
SOIC8 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
http://onsemi.com
8
1
SOIC8
D SUFFIX
CASE 751
MARKING
DIAGRAM
8
4304x
ALYW G
G
1
DFN8
CASE 488AF
NCP
4304x
ALYWG
1G
4304x = Specific Device Code
x = A or B
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = PbFree Package
(*Note: Microdot may be in either location)
PINOUT INFORMATION
VCC
Min_Toff
Min_Ton
Trig/Disable
18
27
36
45
DRV
GND
COMP
CS
(NOTE: For DFN the exposed pad must be either
unconnected or preferably connected to ground.
The GND pin must be always connected to ground.)
ORDERING INFORMATION
Device
NCP4304ADR2G
NCP4304BDR2G
Package
SOIC8
(PbFree)
SOIC8
(PbFree)
Shipping
2500 /
Tape & Reel
2500 /
Tape & Reel
NCP4304AMNTWG
DFN8
4000 /
(PbFree) Tape & Reel
NCP4304BMNTWG
DFN8
4000 /
(PbFree) Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2012
September, 2012 Rev. 0
1
Publication Order Number:
NCP4304/D
Free Datasheet http://www.datasheet4u.com/

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