NCP4308: Synchronous Rectifier Controller

Description: The NCP4308 is a synchronous rectifier controller ...
  • 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 - 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
  • Notebook Adapters
  • High Power Density AC/DC Power Supplies (Cell Phone Chargers)
  • LCD TVs
  • All SMPS with High Efficiency Requirements
  • End Products
  • Notebook Adapters
  • Smartphone Adapters
  • Tablet Adapters
  • AC-DC Power Adapters
  • LCD TVs
  • Technical Documentation & Design Resources
    Availability and Samples
    NCP4308ADR2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Synchronous Rectifier Controller
  • Package Type: SOIC-8
  • Package Case Outline: 751-07
  • MSL: 3
  • Container Type: REEL
  • Container Qty: 2500
  • Inventory

  • Market Leadtime (weeks):8 to 12
  • Arrow:0
  • Digikey:>1K
  • Mouser:>1K
  • NCP4308AMTTWG
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Synchronous Rectifier Controller
  • Package Type: WDFN-8
  • Package Case Outline: 511AT
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 3000
  • NCP4308DDR2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Synchronous Rectifier Controller
  • Package Type: SOIC-8
  • Package Case Outline: 751-07
  • MSL: 3
  • Container Type: REEL
  • Container Qty: 2500
  • Inventory

  • Market Leadtime (weeks):2 to 4
  • Arrow:0
  • Digikey:>1K
  • Mouser:>1K
  • ON Semiconductor:32,500
  • NCP4308DMNTWG
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Synchronous Rectifier Controller
  • Package Type: DFN-8
  • Package Case Outline: 488AF
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 4000
  • Inventory

  • Market Leadtime (weeks):2 to 4
  • Arrow:0
  • ON Semiconductor:16,000
  • NCP4308DMTTWG
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Synchronous Rectifier Controller
  • Package Type: WDFN-8
  • Package Case Outline: 511AT
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 3000
  • Inventory

  • Market Leadtime (weeks):13 to 16
  • Arrow:0
  • ON Semiconductor:3,000
  • NCP4308QDR2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Synchronous Rectifier Controller
  • Package Type: SOIC-8
  • Package Case Outline: 751-07
  • MSL: 3
  • Container Type: REEL
  • Container Qty: 2500
  • Inventory

  • Market Leadtime (weeks):2 to 4
  • Arrow:0
  • Digikey:>1K
  • Mouser:>1K
  • ON Semiconductor:12,500
  • Specifications
  • VCC Max (V): 37 
  • Vref Typ (V): N/A 
  • ICC Max (A): 0.0056 
  • TA Min (°C): -40 
  • TA Max (°C): 125 
  • Package Type: SOIC-8  WDFN-8  DFN-8 
  • ON Semiconductor Full Web Site