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 Title	Document ID/Size	Revision	Revision Date
Secondary Side Synchronous Rectifiation Driver for High Efficiency SMPS Topologies	NCP4305/D (692kB)	3	Jun, 2016

Evaluation Board Documents (25)

Document Title	Document ID/Size	Revision	Revision Date
Implementation High Power Notebook Adapter Evaluation Board User's Manual	EVBUM2341/D (1442kB)	1	Feb, 2016
Implementing All-in-One PC Power Supply Evaluation Board User's Manual	EVBUM2342/D (1827kB)	1	Dec, 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 Schematic	NCP1399ADPGEVB_SCHEMATIC.pdf (123kB)	0
NCP1399ADPGEVB Test Procedure	NCP1399ADPGEVB_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 Schematic	NCP1399AIOGEVB_SCHEMATIC.pdf (724kB)	1
NCP1399AIOGEVB Test Procedure	NCP1399AIOGEVB_TEST_PROCEDURE.pdf (61kB)	0
NCP4305 Synchronous Rectification Evaluation Board User's Manual	EVBUM2349/D (262kB)	1	Jan, 2016
NCP4305 Synchronous Rectification Evaluation Board User's Manual	EVBUM2350/D (272kB)	1	Jan, 2016
NCP4305FBDAP Evaluation Board User's Manual	EVBUM2340/D (1678kB)	0	Dec, 2015
NCP4305FBDAPGEVB Bill of Materials ROHS Compliant	NCP4305FBDAPGEVB_BOM_ROHS.pdf (218kB)	0
NCP4305FBDAPGEVB Gerber Layout Files (Zip Format)	NCP4305FBDAPGEVB_GERBER.zip (97kB)	0
NCP4305FBDAPGEVB Schematic	NCP4305FBDAPGEVB_SCHEMATIC.pdf (132kB)	0
NCP4305FBDAPGEVB Test Procedure	NCP4305FBDAPGEVB_TEST_PROCEDURE.pdf (351kB)	0
NCP4305FLY40GEVB Bill of Materials ROHS Compliant	NCP4305FLY40GEVB_BOM_ROHS.pdf (143kB)	0
NCP4305FLY40GEVB Gerber Layout Files (Zip Format)	NCP4305FLY40GEVB_GERBER.zip (23kB)	0
NCP4305FLY40GEVB Schematic	NCP4305FLY40GEVB_SCHEMATIC.pdf (17kB)	0
NCP4305FLY40GEVB Test Procedure	NCP4305FLY40GEVB_TEST_PROCEDURE.pdf (249kB)	1
NCP4305LLCGEVB Bill of Materials ROHS Compliant	NCP4305LLCGEVB_BOM_ROHS.pdf (137kB)	0
NCP4305LLCGEVB Gerber Layout Files (Zip Format)	NCP4305LLCGEVB_GERBER.zip (24kB)	0
NCP4305LLCGEVB Schematic	NCP4305LLCGEVB_SCHEMATIC.pdf (27kB)	0
NCP4305LLCGEVB Test Procedure	NCP4305LLCGEVB_TEST_PROCEDURES.pdf (302kB)	1

Package Drawings (3)

Document Title	Document ID/Size	Revision
8 PIN DFN, 4x4	488AF (61.3kB)	C
SOIC-8 Narrow Body	751-07 (62.6kB)	AK
WDFN8 2x2, 0.5P	511AT (61.2kB)	O

Evaluation/Development Tool Information

Product	Status	Compliance	Short Description
NCP1399ADPGEVB	Active	Pb-free	150W Adapter Power Supply Evaluation Board
NCP1399AIOGEVB	Active	Pb-free	240W All-in-One PC Power Supply Evaluation Board
NCP4305FBDAPGEVB	Active	Pb-free	65W Off-Line Adapter with Synchronous Rectification and Featuring Very Low No-Load Power Consumption Evaluation Board
NCP4305FLY40GEVB	Active	Pb-free	A high efficiency synchronous rectification evaluation board
NCP4305LLCGEVB	Active	Pb-free	A high efficiency synchronous rectification evaluation board

Order Information

Product	Status	Compliance	Package		MSL*	Container		Budgetary Price/Unit
NCP4305ADR2G	Active	Pb-free Halide free	SOIC-8	751-07	3	Tape and Reel	2500	$0.5867
NCP4305AMTTWG	Active	Pb-free Halide free	WDFN-8	511AT	1	Tape and Reel	3000	$0.56
NCP4305DDR2G	Active	Pb-free Halide free	SOIC-8	751-07	3	Tape and Reel	2500	$0.5867
NCP4305DMNTWG	Active	Pb-free Halide free	DFN-8	488AF	1	Tape and Reel	4000	$0.6267
NCP4305DMTTWG	Active	Pb-free Halide free	WDFN-8	511AT	1	Tape and Reel	3000	$0.6267
NCP4305QDR2G	Active	Pb-free Halide free	SOIC-8	751-07	3	Tape and Reel	2500	$0.5867

Specifications

Product	VCC Max (V)	Vref Typ (V)	ICC Max (A)	TA Min (°C)	TA Max (°C)
NCP4305ADR2G	37	N/A	0.0056	-40	125
NCP4305AMTTWG	37	N/A	0.0056	-40	125
NCP4305DDR2G	37	N/A	0.006	-40	125
NCP4305DMNTWG	37	N/A	0.006	-40	125
NCP4305DMTTWG	37	N/A	0.006	-40	125
NCP4305QDR2G	37	N/A	0.006	-40	125