NCP4304A, NCP4304B
Secondary Side
Synchronous Rectification
Driver for High Efficiency
SMPS Topologies
http://onsemi.com
MARKING
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.
DIAGRAM
8
SOIC−8
D SUFFIX
CASE 751
4304x
8
ALYW G
1
G
1
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.
NCP
4304x
ALYWG
G
DFN8
CASE 488AF
1
Finally, a wide operating V range combined with two versions of
CC
driver voltage clamp eases implementation of the SR system in 24 V
output applications.
4304x = Specific Device Code
x = A or B
A
L
= Assembly Location
= Wafer Lot
Features
Y
W
G
= Year
= Work Week
= Pb−Free Package
• Self-Contained Control of Synchronous Rectifier in CCM, DCM, and
QR Flyback Applications
• Precise True Secondary Zero Current Detection with Adjustable
Threshold
(*Note: Microdot may be in either location)
• Automatic Parasitic Inductance Compensation Input
PINOUT INFORMATION
• Typically 40 ns Turn off Delay from Current Sense Input to Driver
• Zero Current Detection Pin Capability up to 200 V
DRV
GND
COMP
CS
V
1
2
3
4
8
7
6
5
CC
Min_Toff
Min_Ton
Trig/Disable
• Optional Ultrafast Trigger Interface for Further Improved
Performance in Applications that Work in Deep CCM
• Disable Input to Enter Standby or Low Consumption Mode
(NOTE: For DFN the exposed pad must be either
unconnected or preferably connected to ground.
The GND pin must be always connected to ground.)
• Adjustable Minimum On Time Independent of V Level
CC
• Adjustable Minimum Off Time Independent of V Level
CC
ORDERING INFORMATION
• 5 A/2.5 A Peak Current Sink/Source Drive Capability
• Operating Voltage Range up to 30 V
†
Device
Package
Shipping
• 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
• SOIC−8 Package
NCP4304ADR2G
SOIC−8
2500 /
(Pb−Free)
Tape & Reel
NCP4304BDR2G
SOIC−8
2500 /
(Pb−Free)
Tape & Reel
NCP4304AMNTWG
DFN8
4000 /
• These are Pb-Free Devices
(Pb−Free)
Tape & Reel
Typical Applications
NCP4304BMNTWG
DFN8
4000 /
(Pb−Free)
Tape & Reel
• Notebook Adapters
• High Power Density AC/DC Power Supplies
• Gaming Consoles
†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.
• All SMPS with High Efficiency Requirements
© Semiconductor Components Industries, LLC, 2013
1
Publication Order Number:
March, 2013 − Rev. 1
NCP4304/D