Product Overview

Product Overview
NCP4308: Synchronous Rectifier Controller
For complete documentation, see the data sheet
Product Description
The NCP4308 is a synchronous rectifier controller for switch mode
power supplies. The controller enables high efficiency designs for
flyback, quasi resonant flyback and LLC topologies.
Externally adjustable minimum off-time and on-time blanking
periods provides flexibility to drive various MOSFET package types
and PCB layout. A reliable and noise less operation of the SR system is
insured due to the Self Synchronization feature. The NCP4308 also
utilizes Kelvin connection of the driver to the MOSFET to achieve high
efficiency operation at full load.
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. The high
accuracy driver and 5 V gate clamp make it ideally suited for directly
driving GaN devices.
To provide more flexibility in PCB layout there are two versions of this product.
NCP4308 does NOT have LLD function
NCP43080 has LLD function
Features
• Self-Contained Control of Synchronous Rectifier in CCM,
DCM and QR for Flyback or LLC Applications
• Precise True Secondary Zero Current Detection
• Rugged Current Sense Pin (up to 150 V)
• Adjustable Minimum ON-Time
• Adjustable Minimum OFF-Time with Ringing Detection
• Adjustable Maximum ON-Time for CCM Controlling of
Primary QR Controller
• Operating Voltage Range up to VCC = 35 V
• 8 A / 4 A Peak Current Sink / Source Drive Capability
• GaN Transistor Driving Capability (options A and C)
• Low Startup Current Consumption
For more features, see the data sheet
Applications
• Notebook Adapters
• High Power Density AC/DC Power Supplies (Cell Phone
Chargers)
• LCD TVs
• All SMPS with High Efficiency Requirements
Benefits
• Robust design during power excurtion
•
•
•
•
•
Provides negligible switching losses and prolongs FET life
Robustness
Improves efficiency and design flexibility
Improves efficiency and design flexibility
Improves efficiency and design flexibility
• Advantage with multiple Vout such as smart charging or
USB-PD
• higher drive strenght provides higher efficiency
• GaN FET further improve efficiency and solution size
• Improves standby power consumption
End Products
• Notebook Adapters
• Smartphone Adapters
• Tablet Adapters
• AC-DC Power Adapters
• LCD TVs
Part Electrical Specifications
Product
NCP4308ADR2G
Compliance
Status
VCC Max (V)
Vref Typ (V)
ICC Max (A)
TA Min (°C)
TA Max (°C)
Package Type
Pb-free
NEW
37
N/A
0.0056
-40
125
SOIC-8
ProductPre
view
37
N/A
0.0056
-40
125
WDFN-8
NEW
37
N/A
0.0056
-40
125
SOIC-8
ProductPre
view
37
N/A
0.0056
-40
125
DFN-8
ProductPre
view
37
N/A
0.0056
-40
125
WDFN-8
NEW
37
N/A
0.0056
-40
125
SOIC-8
Halide free
NCP4308AMTTWG
Pb-free
Halide free
NCP4308DDR2G
Pb-free
Halide free
NCP4308DMNTWG
Pb-free
Halide free
NCP4308DMTTWG
Pb-free
Halide free
NCP4308QDR2G
Pb-free
Halide free
For more information please contact your local sales support at www.onsemi.com
Created on: 6/30/2016