NCP4305: Secondary Side Controller, Synchronous Rectification, for High Efficiency SMPS Topologies

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
  • Precise True Secondary Zero Current Detection with Adjustable Threshold
  • Typically 20 ns Turn off Delay from Current Sense Input to Driver
  • Zero Current Detection Pin Capability up to 200 V
  • Optional Ultrafast (7ns) Trigger Input
  • Disable Input
  • Adjustable Minimum ON Time and Minimum OFF Time
  • Self Synchronization
  • 8 A Sink, 4 A Source Drive capability
  • Light Load Detection with Modulated Gate Drive
  • 4.5 V & 9 V UVLO Options and 36 V(Max)
Benefits
  • Allows for proper timing of SR MOSFET turn on and turn off
  • Maximizes conduction time of the MOSFET to increase efficiency
  • Allows direct connection of CS input to MOSFET drain in flyback applications
  • Improves performance for applications working in deep CCM
  • Enters the IC into a low consumption standby mode
  • Prevents accidental MOSFET turn on or turn off due to ringing
  • Ensures proper DRV pulses during operation
  • Fast turn off of MOSFET for optimized conduction period
  • Increased stability coming in and out of Light Load
  • Wide output operating voltages
Applications
  • High Power Density AC/DC Power Supplies
End Products
  • Notebook Adapters
  • Server Power Supplies
  • ATX & All-in-one Power Supplies
  • High Density USB Adapters
Data Sheets (1)
Document TitleDocument ID/SizeRevisionRevision Date
Secondary Side Synchronous Rectifiation Driver for High Efficiency SMPS TopologiesNCP4305/D (692kB)3Jun, 2016
Evaluation Board Documents (25)
Document TitleDocument ID/SizeRevisionRevision Date
Implementation High Power Notebook Adapter Evaluation Board User's ManualEVBUM2341/D (1442kB)1Feb, 2016
Implementing All-in-One PC Power Supply Evaluation Board User's ManualEVBUM2342/D (1827kB)1Dec, 2015
NCP1399ADPGEVB Bill Of Materials (ROHS Compliant)NCP1399ADPGEVB_BOM_ROHS.pdf (117kB)0
NCP1399ADPGEVB Gerber Layout Files (Zip Format)NCP1399ADPGEVB_GERBER.rev0.zip (85kB)0
NCP1399ADPGEVB SchematicNCP1399ADPGEVB_SCHEMATIC.pdf (123kB)0
NCP1399ADPGEVB Test ProcedureNCP1399ADPGEVB_TEST_PROCEDURE.pdf (94kB)1
NCP1399AIOGEVB Bill Of Materials (ROHS Compliant)NCP1399AIOGEVB_BOM_ROHS.pdf (120kB)0
NCP1399AIOGEVB Gerber Layout Files (Zip Format)NCP1399AIOGEVB_GERBER.zip (232kB)0
NCP1399AIOGEVB SchematicNCP1399AIOGEVB_SCHEMATIC.pdf (724kB)1
NCP1399AIOGEVB Test ProcedureNCP1399AIOGEVB_TEST_PROCEDURE.pdf (61kB)0
NCP4305 Synchronous Rectification Evaluation Board User's ManualEVBUM2349/D (262kB)1Jan, 2016
NCP4305 Synchronous Rectification Evaluation Board User's ManualEVBUM2350/D (272kB)1Jan, 2016
NCP4305FBDAP Evaluation Board User's ManualEVBUM2340/D (1678kB)0Dec, 2015
NCP4305FBDAPGEVB Bill of Materials ROHS CompliantNCP4305FBDAPGEVB_BOM_ROHS.pdf (218kB)0
NCP4305FBDAPGEVB Gerber Layout Files (Zip Format)NCP4305FBDAPGEVB_GERBER.zip (97kB)0
NCP4305FBDAPGEVB SchematicNCP4305FBDAPGEVB_SCHEMATIC.pdf (132kB)0
NCP4305FBDAPGEVB Test ProcedureNCP4305FBDAPGEVB_TEST_PROCEDURE.pdf (351kB)0
NCP4305FLY40GEVB Bill of Materials ROHS CompliantNCP4305FLY40GEVB_BOM_ROHS.pdf (143kB)0
NCP4305FLY40GEVB Gerber Layout Files (Zip Format)NCP4305FLY40GEVB_GERBER.zip (23kB)0
NCP4305FLY40GEVB SchematicNCP4305FLY40GEVB_SCHEMATIC.pdf (17kB)0
NCP4305FLY40GEVB Test ProcedureNCP4305FLY40GEVB_TEST_PROCEDURE.pdf (249kB)1
NCP4305LLCGEVB Bill of Materials ROHS CompliantNCP4305LLCGEVB_BOM_ROHS.pdf (137kB)0
NCP4305LLCGEVB Gerber Layout Files (Zip Format)NCP4305LLCGEVB_GERBER.zip (24kB)0
NCP4305LLCGEVB SchematicNCP4305LLCGEVB_SCHEMATIC.pdf (27kB)0
NCP4305LLCGEVB Test ProcedureNCP4305LLCGEVB_TEST_PROCEDURES.pdf (302kB)1
Package Drawings (3)
Document TitleDocument ID/SizeRevision
8 PIN DFN, 4x4488AF (61.3kB)C
SOIC-8 Narrow Body751-07 (62.6kB)AK
WDFN8 2x2, 0.5P511AT (61.2kB)O
Evaluation/Development Tool Information
ProductStatusComplianceShort Description
NCP1399ADPGEVBActivePb-free150W Adapter Power Supply Evaluation Board
NCP1399AIOGEVBActivePb-free240W All-in-One PC Power Supply Evaluation Board
NCP4305FBDAPGEVBActivePb-free65W Off-Line Adapter with Synchronous Rectification and Featuring Very Low No-Load Power Consumption Evaluation Board
NCP4305FLY40GEVBActivePb-freeA high efficiency synchronous rectification evaluation board
NCP4305LLCGEVBActivePb-freeA high efficiency synchronous rectification evaluation board
Order Information
ProductStatusCompliancePackageMSL*ContainerBudgetary Price/Unit
NCP4305ADR2GActivePb-free Halide freeSOIC-8751-073Tape and Reel2500$0.5867
NCP4305AMTTWGActivePb-free Halide freeWDFN-8511AT1Tape and Reel3000$0.56
NCP4305DDR2GActivePb-free Halide freeSOIC-8751-073Tape and Reel2500$0.5867
NCP4305DMNTWGActivePb-free Halide freeDFN-8488AF1Tape and Reel4000$0.6267
NCP4305DMTTWGActivePb-free Halide freeWDFN-8511AT1Tape and Reel3000$0.6267
NCP4305QDR2GActivePb-free Halide freeSOIC-8751-073Tape and Reel2500$0.5867
Specifications
ProductVCC Max (V)Vref Typ (V)ICC Max (A)TA Min (°C)TA Max (°C)
NCP4305ADR2G37N/A0.0056-40125
NCP4305AMTTWG37N/A0.0056-40125
NCP4305DDR2G37N/A0.006-40125
NCP4305DMNTWG37N/A0.006-40125
NCP4305DMTTWG37N/A0.006-40125
NCP4305QDR2G37N/A0.006-40125
Secondary Side Synchronous Rectifiation Driver for High Efficiency SMPS Topologies (692kB) NCP4305
EVBUM2341/D - 1442 KB NCP1399ADPGEVB
EVBUM2342/D - 1827 KB NCP1399AIOGEVB
NCP1399ADPGEVB BOM ROHS NCP1399ADPGEVB
NCP1399ADPGEVB GERBER NCP1399ADPGEVB
NCP1399ADPGEVB SCHEMATIC NCP1399ADPGEVB
NCP1399ADPGEVB TEST PROCEDURE NCP1399ADPGEVB
NCP1399AIOGEVB BOM ROHS NCP1399AIOGEVB
NCP1399AIOGEVB GERBER NCP1399AIOGEVB
NCP1399AIOGEVB SCHEMATIC NCP1399AIOGEVB
NCP1399AIOGEVB TEST PROCEDURE NCP1399AIOGEVB
EVBUM2349/D - 262 KB NCP4305LLCGEVB
EVBUM2350/D - 272 KB NCP4305LLCGEVB
EVBUM2340/D - 1678 KB NCP4305FBDAPGEVB
NCP4305FBDAPGEVB BOM ROHS NCP4305FBDAPGEVB
NCP4305FBDAPGEVB GERBER NCP4305FBDAPGEVB
NCP4305FBDAPGEVB SCHEMATIC NCP4305FBDAPGEVB
NCP4305FBDAPGEVB TEST PROCEDURE NCP4305FBDAPGEVB
NCP4305FLY40GEVB BOM ROHS NCP4305FLY40GEVB
NCP4305FLY40GEVB GERBER NCP4305FLY40GEVB
NCP4305FLY40GEVB SCHEMATIC NCP4305FLY40GEVB
NCP4305FLY40GEVB TEST PROCEDURE NCP4305FLY40GEVB
NCP4305LLCGEVB BOM ROHS NCP4305LLCGEVB
NCP4305LLCGEVB GERBER NCP4305LLCGEVB
NCP4305LLCGEVB SCHEMATIC NCP4305LLCGEVB
NCP4305LLCGEVB TEST PROCEDURES NCP4305LLCGEVB
8 PIN DFN, 4x4 NCP43080
WDFN8 2x2, 0.5P NB3V60113G
SOIC-8 Narrow Body CM1216