NCP4305 Datasheet, PDF (1/52 Pages) ON Semiconductor – Secondary Side Synchronous Rectification Driver

NCP4305
Secondary Side
Synchronous Rectification
Driver for High Efficiency
SMPS Topologies
The NCP4305 is high performance driver tailored to control a
www.onsemi.com
synchronous rectification MOSFET in switch mode power supplies.
Thanks to its high performance drivers and versatility, it can be used in
MARKING
DIAGRAMS
various topologies such as DCM or CCM flyback, quasi resonant
flyback, forward and half bridge resonant LLC.
The combination of externally adjustable minimum off-time and
on-time blanking periods helps to fight the ringing induced by the PCB
layout and other parasitic elements. A reliable and noise less operation
of the SR system is insured due to the Self Synchronization feature. The
8
1
SOIC−8
D SUFFIX
CASE 751
8
NCP4305x
ALYW G
G
1
NCP4305 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.
1
4305x
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
DFN8
MN SUFFIX
CASE 488AF
ALYWG
G
maximum SMPS efficiency. The high accuracy driver and 5 V gate
clamp enables the use of GaN FETs.
Features
• Self−Contained Control of Synchronous Rectifier in CCM, DCM and
QR for Flyback, Forward or LLC Applications
• Precise True Secondary Zero Current Detection
• Typically 12 ns Turn off Delay from Current Sense Input to Driver
• Rugged Current Sense Pin (up to 200 V)
WDFN8
MT SUFFIX
CASE 511AT
1
5xMG
G
4305x = Specific Device Code
x = A, B, C, D or Q
A
= Assembly Location
• Ultrafast Turn−off Trigger Interface/Disable Input (7.5 ns)
• Adjustable Minimum ON−Time
• Adjustable Minimum OFF-Time with Ringing Detection
• Adjustable Maximum ON−Time for CCM Controlling of Primary
QR Controller
L
= Wafer Lot
Y
= Year
W
= Work Week
M
= Date Code
G
= Pb−Free Package
(Note: Microdot may be in either location)
• Improved Robust Self Synchronization Capability
• 8 A / 4 A Peak Current Sink / Source Drive Capability
• Operating Voltage Range up to V_CC = 35 V
• Automatic Light−load & Disable Mode
ORDERING INFORMATION
See detailed ordering and shipping information on page 49 of
this data sheet.
• Adaptive Gate Drive Clamp
• GaN Transistor Driving Capability (options A and C)
• Low Startup and Disable Current Consumption
• Maximum Operation Frequency up to 1 MHz
• SOIC-8 and DFN−8 (4x4) and WDFN8 (2x2) Packages
• 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
© Semiconductor Components Industries, LLC, 2015
1
June, 2015 − Rev. 1
Publication Order Number:
NCP4305/D