NCP4303A Datasheet, PDF (1/26 Pages) ON Semiconductor – Secondary Side Synchronous Rectification Driver for High Efficiency SMPS Topologies

NCP4303A/B
Secondary Side
Synchronous Rectification
Driver for High Efficiency
SMPS Topologies
The NCP4303A/B is a full featured controller and driver tailored to
control synchronous rectification circuitry in switch mode power
supplies. Thanks 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 V_CC 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
• Ultrafast Trigger Interface to External Signal for CCM operation
• Disable Input to Enter Standby or Low Consumption Mode
• Adjustable Minimum On Time Independent of V_CC Level
• Adjustable Minimum Off Time Independent of V_CC 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 (NCP4303A) or 6 V (NCP4303B)
• Low Startup and Standby Current Consumption
• Maximum Frequency of Operation up to 500 kHz
• SOIC−8 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
MARKING
DIAGRAM
8
1
SOIC−8
D SUFFIX
CASE 751
8
XXXXX
ALYWX
G
1
xx
= Specific Device Code
A
= Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
G or G = Pb−Free Package
PINOUT INFORMATION
V_CC
Min_Toff
Min_Ton
Trig/Disable
18
27
36
45
DRV
GND
COMP
CS
ORDERING INFORMATION
Device
Package
Shipping^†
NCP4303ADR2G
NCP4303BDR2G
SOIC−8
(Pb−Free)
SOIC−8
(Pb−Free)
2500 /
Tape & Reel
2500 /
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, 2010
1
April, 2010 − Rev. 1
Publication Order Number:
NCP4303/D