NCP4303: Secondary Side Controller, Synchronous Rectification, for High Efficiency SMPS

Datasheet: Secondary Side Synchronous Rectification Driver for High Efficiency SMPS Topologies
Rev. 5 (1136kB)
Product Overview
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Product Change Notification
The NCP4303A/B is a full featured controller and driver tailored to control synchronous rectifier circuitry in switch mode power supplies. Because of its versatility, it can be used in various topologies such as flyback, forward and half bridge resonant LLC.
The combination of externally adjustable minimum on and off times helps to fight the ringing induced by the PCB layout and other parasitic elements. Therefore, a reliable and noise less operation of the SR system is insured.
The extremely low turn off delay time, high sink current capability of the driver and automatic package parasitic inductance compensation system allow to maximize synchronous rectification MOSFET conduction time that enables further increase of SMPS efficiency.
Finally, a wide operating VCC range combined with two versions of driver voltage clamp eases implementation of the SR system in 24 V output applications.

NCP4304 is recommended for new designs. NCP4303 will continue to be supported in production. NCP4304 was introduced to enhance the performance of LLC designs which use the Trigger input. Other performance and applications are the same.
Features   Benefits
     
  • Automatic parasitic inductance compensation input
 
  • Maximizes the conduction time to get the full efficiency benefit of synchronous rectification
  • 40 ns turn off delay from current sense input to driver output
 
  • Fast switching response to current sense inputs
  • Wide Vcc operating range up to 30 V
 
  • Allows direct connection of the Vcc to the output in 24 V output applications
  • Externally adjustable minimum on and minimum off times
 
  • Prevents false switching due to ringing and dropouts induced by the PCB
  • Trigger input for interfacing with primary side switching signal
 
  • Allows the NCP4303 to be used in CCM topologies
  • Disable input for standby mode
 
  • Enters the device into a low consumption state
  • 5 A / 2.5 A peak sink / source drive capability
 
  • High sink capability allows for quick turn-off of the synchronous rectification MOSFET
  • True secondary ZCD with adjustable threshold
 
  • Accurate detection of secondary side current
  • Gate drive clamp of either 12 V (A version) or 6 V (B version)
 
  • Gate drive voltages tailored to the synchronous rectification MOSFET of choice
  • Maximum frequency of operation up to 500 kHz
 
  • Design flexibility
Applications   End Products
  • ATX power supplies
  • High Power AC/DC adapters
  • Flat TV power supplies
 
  • All-in-one PCs
  • Gaming Consoles
  • Notebook Adapters
Technical Documentation & Design Resources
Application Notes (1) Package Drawings (2)
Data Sheets (1) FAQ (1)
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
NCP4303ADR2G Active, Not Rec 
Pb-free
Halide free
NCP4303 SOIC-8 751-07 1 260 Tape and Reel 2500 $0.4267
NCP4303AMNTWG Obsolete
Pb-free
Halide free
NCP4303 DFN-8 488AF 1 260 Tape and Reel 4000  
NCP4303BDR2G Obsolete
Pb-free
Halide free
NCP4303 SOIC-8 751-07 1 260 Tape and Reel 2500  
NCP4303BMNTWG Obsolete
Pb-free
Halide free
NCP4303 DFN-8 488AF 1 260 Tape and Reel 4000  
Market Leadtime (weeks) : Contact Factory
PandS   (2020-09-14 00:00) : >1K
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : Contact Factory
PandS   (2020-09-14 00:00) : >1K
Market Leadtime (weeks) : Contact Factory
Case Outlines
751-07    488AF   
Packages
NCP4303: Secondary Side Controller, Synchronous Rectification, for High Efficiency SMPS
NCP4303: Secondary Side Controller, Synchronous Rectification, for High Efficiency SMPS
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