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NCP4308: Synchronous Rectifier Controller

Datasheet: Synchronous Rectifier Controller
Rev. 1 (376kB)
Product Overview
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» Product Change Notification
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   Benefits
     
  • Self−Contained Control of Synchronous Rectifier in CCM, DCM and QR for Flyback or LLC Applications
 
  • Robust design during power excurtion
  • Precise True Secondary Zero Current Detection
 
  • Provides negligible switching losses and prolongs FET life
  • Rugged Current Sense Pin (up to 150 V)
 
  • Robustness
  • Adjustable Minimum ON−Time
 
  • Improves efficiency and design flexibility
  • Adjustable Minimum OFF-Time with Ringing Detection
 
  • Improves efficiency and design flexibility
  • Adjustable Maximum ON−Time for CCM Controlling of Primary QR Controller
 
  • Improves efficiency and design flexibility
  • Operating Voltage Range up to VCC = 35 V
 
  • Advantage with multiple Vout such as smart charging or USB-PD
  • 8 A / 4 A Peak Current Sink / Source Drive Capability
 
  • higher drive strenght provides higher efficiency
  • GaN Transistor Driving Capability (options A and C)
 
  • GaN FET further improve efficiency and solution size
  • Low Startup Current Consumption
 
  • Improves standby power consumption
  • Maximum Operation Frequency up to 1 MHz
 
  • Provides higher OFF-ON time accuracy, thus improving efficiency
  • Improved Robust Self Synchronization Capability
   
  • SOIC-8 and DFN−8 (4x4) and WDFN8 (2x2) Packages
   
  • These are Pb−Free Devices
   
Applications   End Products
  • Notebook Adapters
  • High Power Density AC/DC Power Supplies (Cell Phone Chargers)
  • LCD TVs
  • All SMPS with High Efficiency Requirements
 
  • Notebook Adapters
  • Smartphone Adapters
  • Tablet Adapters
  • AC-DC Power Adapters
  • LCD TVs
Technical Documentation & Design Resources
Data Sheets (1) Package Drawings (3)
Availability & Samples
Specifications
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
NCP4308ADR2G Lifetime
Pb-free
Halide free
NCP4308 SOIC-8 751-07 3 260 Tape and Reel 2500 $0.4
NCP4308AMTTWG Lifetime
Pb-free
Halide free
NCP4308 WDFN-8 511AT 1 260 Tape and Reel 3000 $0.4133
NCP4308DDR2G Active
Pb-free
Halide free
NCP4308 SOIC-8 751-07 3 260 Tape and Reel 2500 $0.4
NCP4308DMNTWG Lifetime
Pb-free
Halide free
NCP4308 DFN-8 488AF 1 260 Tape and Reel 4000 $0.4667
NCP4308DMTTWG Active
Pb-free
Halide free
NCP4308 WDFN-8 511AT 1 260 Tape and Reel 3000 $0.4133
NCP4308QDR2G Lifetime
Pb-free
Halide free
NCP4308 SOIC-8 751-07 3 260 Tape and Reel 2500 $0.4
Market Leadtime (weeks) : Contact Factory
ON Semiconductor   (2020-09-02 00:00) : 2,500
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : 4 to 8
ON Semiconductor   (2020-09-02 00:00) : 20,000
Market Leadtime (weeks) : Contact Factory
ON Semiconductor   (2020-09-02 00:00) : 17,455
Market Leadtime (weeks) : 4 to 8
Market Leadtime (weeks) : Contact Factory

Product
Description
Pricing ($/Unit)
Compliance
Status
VCC Max (V)
Vref Typ (V)
ICC Max (A)
TA Min (°C)
TA Max (°C)
Package Type
NCP4308DDR2G  
 $0.4 
Pb
H
 Active   
37
N/A
0.0056
-40
125
SOIC-8
NCP4308DMTTWG  
 $0.4133 
Pb
H
 Active   
37
N/A
0.0056
-40
125
WDFN-8
Case Outlines
751-07    488AF    511AT   
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