UCC2894 Status: ACTIVE

Current Mode Active Clamp PWM Controller

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Datasheet

UCC289x Current Mode Active Clamp PWM Controller (Rev. F) (PDF 923 KB)
01 Jul 2009

Functional Block Diagram

Enlarge

	UCC2891	UCC2892	UCC2893	UCC2894
Topology	Flyback, Forward	Flyback, Forward	Flyback, Forward	Flyback, Forward
Control Method	Current Mode	Current Mode	Current Mode	Current Mode
PWM Outputs(#)	1	1	1	1
Frequency(Max)(kHz)	1000	1000	1000	1000
UVLO Thresholds On/Off(V)	13.0/8.0	13.0/8.0	13.0/8.0	13.0/8.0
Pin/Package	16SOIC, 16TSSOP	16SOIC, 16TSSOP	16SOIC, 16TSSOP	16SOIC, 16TSSOP
Regulated Outputs(#)	1	1	1	1
	Samples	Samples	Samples	Samples
	Inventory	Inventory	Inventory	Inventory

Customers Who Evaluated This Product Also Evaluated

UCC2891: Current Mode Active Clamp PWM Controller
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TPS62240: 2.25MHz 300mA Step-Down Converter in 2x2mm SON/TSOT23 Package
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Product Information

Features

Low Output Jitter
Soft-Stop Shutdown of MAIN and AUX
Ideal for Active Clamp/Reset Forward, Flyback Converters
Provides Complementary Auxiliary Driver with Programmable Deadtime (Turn-On Delay) between AUX and MAIN Switches
Peak Current-Mode Control with Cycle-by-Cycle Current Limiting
110-V Input Startup Regulator on UCC2891/3
TrueDrive™ 2-A Sink, 2-A Source Outputs
Accurate Line UV and Line OV Threshold
Programmable Slope Compensation
1.0-MHz Synchronizable Oscillator
Precise Programmable Maximum Duty Cycle
Programmable Soft Start
APPLICATIONS
- 150-W to 700-W SMPS
- High-Efficiency, Low EMI/RFI Off-Line or DC/DC Converters
- Server, 48-V Telecom, Datacom
- High Power Adapter, LCD-TV and PDP-TV

Description

The UCC2891/2/3/4 family of PWM controllers is designed to simplify implementation of the various active clamp/reset switching power topologies.

The UCC289x is a peak current-mode, fixedfrequency, high-performance pulse width modulator. It includes the logic and the drive capability for the auxiliary switch with a simple method of programming the critical delays for proper active clamp operation.

The UCC2891/3 includes a 110-V start-up regulator for initial start-up and to provide keep-alive power during stand-by.

Additional features include an internal programmable slope compensation circuit, precise D_MAX limit, and a single resistor programmable synchronizable oscillator. An accurate line monitoring function also programs the converter\x92s ON and OFF transitions with regard to the bulk input voltage.

View All Description in Datasheet

Pricing / Packaging / CAD Design Tools / Samples

			Price	Packaging			CAD Design Tools		Samples
Device	Status	Temp (^oC)	Price \| Quantity	Package \| Pins	Top Side Marking	Package QTY \| Package Carrier	Symbols	Footprints	Samples
UCC2894D	ACTIVE	-40 to 85	1.55 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE
UCC2894DG4	ACTIVE	-40 to 85	1.55 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE
UCC2894DR	ACTIVE	-40 to 85	1.20 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R	Purchase Samples
UCC2894DRG4	ACTIVE	-40 to 85	1.20 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R	Purchase Samples
UCC2894PW	ACTIVE	-40 to 85	1.30 \| 1ku	TSSOP (PW) \| 16	View	90 \| TUBE	Purchase Samples
UCC2894PWG4	ACTIVE	-40 to 85	1.30 \| 1ku	TSSOP (PW) \| 16	View	90 \| TUBE	Purchase Samples
UCC2894PWR	ACTIVE	-40 to 85	1.20 \| 1ku	TSSOP (PW) \| 16	View	2000 \| LARGE T&R	Purchase Samples
UCC2894PWRG4	ACTIVE	-40 to 85	1.20 \| 1ku	TSSOP (PW) \| 16	View	2000 \| LARGE T&R	Purchase Samples

* Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For higher volume price quotes,prices in local currency or delivery quotes, please contact your local Texas Instruments Sales Office or Authorized Distributor.

Inventory

Reported Distributor Inventory as of 9:50 AM GMT, 20 Nov 2009
Region	Company	In Stock	Purchase
TI Lead Time*: 20 WeeksUCC2894D
Americas	Rochester Electronics	300
TI Lead Time*: 20 WeeksUCC2894DG4
None Reported View Distributors
TI Lead Time*: 20 WeeksUCC2894DR
None Reported View Distributors
TI Lead Time*: 20 WeeksUCC2894DRG4
None Reported View Distributors
TI Lead Time*: 20 WeeksUCC2894PW
Americas	Newark	179
Asia	WPI	170
TI Lead Time*: 20 WeeksUCC2894PWG4
None Reported View Distributors
TI Lead Time*: 20 WeeksUCC2894PWR
None Reported View Distributors
TI Lead Time*: 20 WeeksUCC2894PWRG4
None Reported View Distributors
View all Distributors

** Lead time information is not available at this time. However, our information is updated daily so please check back with us soon. Please contact your preferred TI Authorized Distributor for additional information.

Quality & Lead (Pb)-Free Data

	Product Content				DPPM / MTBF / FIT Rate
Device	Eco Plan*	Lead / Ball Finish	MSL Rating / Peak Reflow	Details	Details
UCC2894D	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UCC2894DG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UCC2894DR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UCC2894DRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UCC2894PW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UCC2894PWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UCC2894PWR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UCC2894PWRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View

* The planned eco-friendly classification: Pb-Free (RoHS) or Pb-Free (RoHS Exempt) or Green (RoHS & no Sb/Br) - please click on the Product Content Details "View" link in the table above for the latest availability information and additional product content details.

If the information you are requesting is not available online at this time, contact one of our Product Information Centers regarding the availability of this information.

Technical Documents

Most useful technical documents for UCC2894

Datasheet

UCC289x Current Mode Active Clamp PWM Controller (Rev. F) (PDF, 923 KB)
01 Jul 2009

Application Notes

UCC2891 Active Clamp (HTM, 8 KB) 5627 views
22 Dec 2003 Read Abstract

View Application Notes for PWM Power Supply Controllers

Tools & Software

Name	Part #	Company	Tool / Software Type
UCC2891 Evaluation Module	UCC2891EVM	Texas Instruments	Development Boards/EVMs

Simulation Models

PSpice Model
- UCC289x PSpice Average Model (ZIP, 353 KB) 311 views
  06 Oct 2008

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UCC2894 Status: ACTIVE

Current Mode Active Clamp PWM Controller

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Datasheet

Functional Block Diagram

Customers Who Evaluated This Product Also Evaluated

Product Information

Features

Description

Pricing / Packaging / CAD Design Tools / Samples

Inventory

Quality & Lead (Pb)-Free Data

Technical Documents

Datasheet

Application Notes

Tools & Software

Simulation Models

Support and Community

Customer Tags

Other Support

UCC2894 Status: ACTIVE

Current Mode Active Clamp PWM Controller

Most Popular Links

Datasheet

Functional Block Diagram

Customers Who Evaluated This Product Also Evaluated

Product Information

Features

Description

Pricing / Packaging / CAD Design Tools / Samples

Inventory

Quality & Lead (Pb)-Free Data

Technical Documents

Datasheet

Application Notes

Tools & Software

Simulation Models

Related Products

Related End Equipments

Support and Community

Customer Tags

Other Support