NCP4308: Synchronous Rectifier Controller _ BDTIC a Leading Distributor in China

NCP4308: 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
Precise True Secondary Zero Current Detection
Rugged Current Sense Pin (up to 150 V)
Adjustable Minimum ON−Time
Adjustable Minimum OFF-Time with Ringing Detection
Adjustable Maximum ON−Time for CCM Controlling of Primary QR Controller
Operating Voltage Range up to VCC = 35 V
8 A / 4 A Peak Current Sink / Source Drive Capability
GaN Transistor Driving Capability (options A and C)
Low Startup Current Consumption
Maximum Operation Frequency up to 1 MHz
Improved Robust Self Synchronization Capability
SOIC-8 and DFN−8 (4x4) and WDFN8 (2x2) Packages
These are Pb−Free Devices

Benefits

Robust design during power excurtion
Provides negligible switching losses and prolongs FET life
Robustness
Improves efficiency and design flexibility
Improves efficiency and design flexibility
Improves efficiency and design flexibility
Advantage with multiple Vout such as smart charging or USB-PD
higher drive strenght provides higher efficiency
GaN FET further improve efficiency and solution size
Improves standby power consumption
Provides higher OFF-ON time accuracy, thus improving efficiency

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

Data Sheets (1)

Document Title	Document ID/Size	Revision	Revision Date
Synchronous Rectifier Controller	NCP4308/D (365kB)	0	Feb, 2016

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

Order Information

Product	Status	Compliance	Package		MSL*	Container		Budgetary Price/Unit
NCP4308ADR2G	Active	Pb-free Halide free	SOIC-8	751-07	3	Tape and Reel	2500	$0.3
NCP4308AMTTWG	Active	Pb-free Halide free	WDFN-8	511AT	1	Tape and Reel	3000	$0.31
NCP4308DDR2G	Active	Pb-free Halide free	SOIC-8	751-07	3	Tape and Reel	2500	$0.3
NCP4308DMNTWG	Active	Pb-free Halide free	DFN-8	488AF	1	Tape and Reel	4000	$0.35
NCP4308DMTTWG	Active	Pb-free Halide free	WDFN-8	511AT	1	Tape and Reel	3000	$0.31
NCP4308QDR2G	Active	Pb-free Halide free	SOIC-8	751-07	3	Tape and Reel	2500	$0.3

Specifications

Product	VCC Max (V)	Vref Typ (V)	ICC Max (A)	TA Min (°C)	TA Max (°C)
NCP4308ADR2G	37	N/A	0.0056	-40	125
NCP4308AMTTWG	37	N/A	0.0056	-40	125
NCP4308DDR2G	37	N/A	0.0056	-40	125
NCP4308DMNTWG	37	N/A	0.0056	-40	125
NCP4308DMTTWG	37	N/A	0.0056	-40	125
NCP4308QDR2G	37	N/A	0.0056	-40	125