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NCP4305: Secondary Side Synchronous Rectification Driver for High Efficiency SMPS Topologies

Datasheet: Secondary Side Synchronous Rectifiation Driver for High Efficiency SMPS Topologies
Rev. 3 (692kB)
Product Overview
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The NCP4305 is high performance driver tailored to control a synchronous rectification MOSFET in switch mode power supplies. Thanks to its high performance drivers and versatility, it can be used in 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 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.

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 maximum SMPS efficiency. The high accuracy driver and 5 V gate clamp enables the use of GaN MOSFETs.

Features   Benefits
     
  • Precise True Secondary Zero Current Detection with Adjustable Threshold
 
  • Allows for proper timing of SR MOSFET turn on and turn off
  • Typically 20 ns Turn off Delay from Current Sense Input to Driver
 
  • Maximizes conduction time of the MOSFET to increase efficiency
  • Zero Current Detection Pin Capability up to 200 V
 
  • Allows direct connection of CS input to MOSFET drain in flyback applications
  • Optional Ultrafast (7ns) Trigger Input
 
  • Improves performance for applications working in deep CCM
  • Disable Input
 
  • Enters the IC into a low consumption standby mode
  • Adjustable Minimum ON Time and Minimum OFF Time
 
  • Prevents accidental MOSFET turn on or turn off due to ringing
  • Self Synchronization
 
  • Ensures proper DRV pulses during operation
  • 8 A Sink, 4 A Source Drive capability
 
  • Fast turn off of MOSFET for optimized conduction period
  • Light Load Detection with Modulated Gate Drive
 
  • Increased stability coming in and out of Light Load
  • 4.5 V & 9 V UVLO Options and 36 V(Max)
 
  • Wide output operating voltages
Applications   End Products
  • High Power Density AC/DC Power Supplies
 
  • Notebook Adapters
  • Server Power Supplies
  • ATX & All-in-one Power Supplies
  • High Density USB Adapters
Evaluation/Development Tool Information
Product Status Compliance Short Description Action
NCP1568PD60WGEVB Active
Pb-free
NCP1568 USB-PD 60W Evaluation board
NCP4305FLY40GEVB Active
Pb-free
A high efficiency synchronous rectification evaluation board
Availability & Samples
Specifications
Interactive Block Diagram
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
NCP4305ADR2G Active
Pb-free
Halide free
NCP4305 SOIC-8 751-07 3 260 Tape and Reel 2500 $0.5067
NCP4305AMTTWG Active
Pb-free
Halide free
NCP4305 WDFN-8 511AT 1 260 Tape and Reel 3000 $0.5333
NCP4305DDR2G Active
Pb-free
Halide free
NCP4305 SOIC-8 751-07 3 260 Tape and Reel 2500 $0.5067
NCP4305DMNTWG Active
Pb-free
Halide free
NCP4305 DFN-8 488AF 1 260 Tape and Reel 4000 $0.56
NCP4305DMTTWG Active
Pb-free
Halide free
NCP4305 WDFN-8 511AT 1 260 Tape and Reel 3000 $0.5333
NCP4305QDR2G Active
Pb-free
Halide free
NCP4305 SOIC-8 751-07 3 260 Tape and Reel 2500 $0.5067
Market Leadtime (weeks) : Contact Factory
ON Semiconductor   (2020-09-02 00:00) : 27,500
Market Leadtime (weeks) : 4 to 8
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : 8 to 12
Market Leadtime (weeks) : 8 to 12

Product
Description
Pricing ($/Unit)
Compliance
Status
VCC Max (V)
Vref Typ (V)
ICC Max (A)
TA Min (°C)
TA Max (°C)
Package Type
NCP4305ADR2G  
 $0.5067 
Pb
H
 Active   
37
N/A
0.0056
-40
125
SOIC-8
NCP4305AMTTWG  
 $0.5333 
Pb
H
 Active   
37
N/A
0.0056
-40
125
WDFN-8
NCP4305DDR2G  
 $0.5067 
Pb
H
 Active   
37
N/A
0.006
-40
125
SOIC-8
NCP4305DMNTWG  
 $0.56 
Pb
H
 Active   
37
N/A
0.006
-40
125
DFN-8
NCP4305DMTTWG  
 $0.5333 
Pb
H
 Active   
37
N/A
0.006
-40
125
WDFN-8
NCP4305QDR2G  
 $0.5067 
Pb
H
 Active   
37
N/A
0.006
-40
125
SOIC-8
Case Outlines
751-07    488AF    511AT   
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