UCC2897 Status: ACTIVE

Current Mode Active Clamp PWM Controller

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Datasheet

Advanced Current-Mode Active Clamp PWM Controller (Rev. F) (ucc2897.pdf, 958 KB)
17 Sep 2008 Download

	UCC2897
Control Method	Current Mode
PWM Outputs(#)	1
Frequency(Max)(kHz)	1000
UVLO Thresholds On/Off(V)	13.0/8.0
Pin/Package	20QFN,20TSSOP
	Samples
	Inventory

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Product Information

Features

Ideal for Active Clamp/Reset Forward, Flyback and Synchronous Rectifier Apps
Provides Complementary Auxiliary Driver with Programmable Deadtime (Turn-On Delay) between AUX and MAIN Switches
Peak Current-Mode Control with 0.5-V Cycle-by-Cycle Current Limiting
Hiccup Mode 0.75-V Current Limit
TrueDrive™ 2-A Sink, 2-A Source Outputs
110-V Input Startup Device
Trimmed Internal Bandgap Reference for Accurate Line UV and Line OV Threshold
Programmable Slope Compensation
High-Performance 1.0-MHz Synchronizable Oscillator with Internal Timing Capacitor
Precise Programmable Maximum Duty Cycle
PB-Free Lead Finish Package
APPLICATIONS
- High-Efficiency DC/DC Power Supplies
- Server Power, 48-V Telecom, Datacom, and 42-V Automotive Applications

Description

The UCC2897 PWM controller simplifies implementation of the various active clamp/reset and synchronous rectifier switching power topologies.

Based on the UCC2891 active-clamp controller the UCC2897 is a peak current-mode, fixedfrequency, high-performance pulse width modulator. It includes the logic and the drive capability for the P-channel auxiliary switch along with a simple method of programming the critical delays for proper active clamp operation.

Features include an internal programmable slope compensation circuit, precise D_MAX limit, and a synchronizable oscillator with an internal timing capacitor. An accurate line monitoring function also programs the converter's ON and OFF transitions with regard to the bulk input voltage.

The UCC2897 adds a second level hiccup mode current sense threshold, bi-directional synchronization and the input overvoltage protection functionalities that are not available on the 16-pin UCC2891. The UCC2897 is offered in 20-pin TSSOP (PW) and 20-pin QFN (RTJ) package.

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
UCC2897PW	ACTIVE	-40 to 105	1.50 \| 100u	TSSOP (PW) \| 20	View	70 \| TUBE
UCC2897PWG4	ACTIVE	-40 to 105	1.50 \| 100u	TSSOP (PW) \| 20	View	70 \| TUBE
UCC2897PWR	ACTIVE	-40 to 105	1.50 \| 100u	TSSOP (PW) \| 20	View	2000 \| LARGE T&R	Purchase Samples
UCC2897PWRG4	ACTIVE	-40 to 105	1.50 \| 100u	TSSOP (PW) \| 20	View	2000 \| LARGE T&R	Purchase Samples
UCC2897RTJR	ACTIVE	-40 to 105	1.50 \| 100u	QFN (RTJ) \| 20	View	3000 \| LARGE T&R		Purchase Samples
UCC2897RTJRG4	ACTIVE	-40 to 105	1.50 \| 100u	QFN (RTJ) \| 20	View	3000 \| LARGE T&R		Purchase Samples
UCC2897RTJT	ACTIVE	-40 to 105	1.65 \| 100u	QFN (RTJ) \| 20	View	250 \| SMALL T&R
UCC2897RTJTG4	ACTIVE	-40 to 105	1.65 \| 100u	QFN (RTJ) \| 20	View	250 \| SMALL T&R

* 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

	TI Inventory Status			Reported Distributor Inventory
UCC2897PW	As of 7:48 AM GMT, 10 Oct 2008			As of 7:48 AM GMT, 10 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	>10k \| 7 Nov	4 Weeks	Americas	DigiKey	251
					Newark	150
					Rochester Electronics	653
				Asia	WPI	87
				Europe	Avnet-SILICA	210
UCC2897PWG4	As of 7:48 AM GMT, 10 Oct 2008			As of 7:48 AM GMT, 10 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	>10k \| 7 Nov	4 Weeks	Americas	Avnet	35
UCC2897PWR	As of 7:48 AM GMT, 10 Oct 2008			As of 7:48 AM GMT, 10 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	6127 \| 11 Nov	6 Weeks	None Reported View Distributors
	0*	6889 \| 19 Nov	6 Weeks
UCC2897PWRG4	As of 7:48 AM GMT, 10 Oct 2008			As of 7:48 AM GMT, 10 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	6127 \| 11 Nov	6 Weeks	None Reported View Distributors
	0*	6889 \| 19 Nov	6 Weeks
UCC2897RTJR	As of 7:48 AM GMT, 10 Oct 2008			As of 7:48 AM GMT, 10 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	>10k*	>10k \| 18 Nov	6 Weeks	None Reported View Distributors
UCC2897RTJRG4	As of 7:48 AM GMT, 10 Oct 2008			As of 7:48 AM GMT, 10 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	>10k*	>10k \| 18 Nov	6 Weeks	None Reported View Distributors
UCC2897RTJT	As of 7:48 AM GMT, 10 Oct 2008			As of 7:48 AM GMT, 10 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	1939*	>10k \| 1 Dec	6 Weeks	Americas	DigiKey	243
	1939*		6 Weeks	Americas	Mouser Electronics	240
UCC2897RTJTG4	As of 7:48 AM GMT, 10 Oct 2008			As of 7:48 AM GMT, 10 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	1939*	>10k \| 1 Dec	6 Weeks	None Reported View Distributors
View all Distributors

* Our information is updated daily, so please check back with us soon if this does not meet your needs. You may also contact your TI Authorized Distributor , including those listed above, for real time stock information.

** 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
UCC2897PW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UCC2897PWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UCC2897PWR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UCC2897PWRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UCC2897RTJR	Green (RoHS & no Sb/Br)	Cu NiPdAu	Level-2-260C-1 YEAR	View	View
UCC2897RTJRG4	Green (RoHS & no Sb/Br)	Cu NiPdAu	Level-2-260C-1 YEAR	View	View
UCC2897RTJT	Green (RoHS & no Sb/Br)	Cu NiPdAu	Level-2-260C-1 YEAR	View	View
UCC2897RTJTG4	Green (RoHS & no Sb/Br)	Cu NiPdAu	Level-2-260C-1 YEAR	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

Datasheets

Advanced Current-Mode Active Clamp PWM Controller (Rev. F) (ucc2897.pdf, 958 KB)
17 Sep 2008 Download

Application Notes

UCC2891 Active Clamp (slua303.htm, 8 KB)
22 Dec 2003 Abstract

View Application Notes for PWM Power Supply Controllers

User Guides

Reference Design PR265A (Rev. A) (sluu192a.pdf, 397 KB)
01 Apr 2004 Download

View User Guides for PWM Power Supply Controllers

More Literature

Reference Design Cookbook 2 - Power Management (slub012.pdf, 3733 KB)
27 Feb 2006 Download

Complementary Products - Can be used with UCC2897
Part #	Name	Product Family	Comments
TPS2390	Simple -48V Hot Swap Controller	HOT SWAP POWER MANAGEMENT- HOT-SWAP CONTROLLERS (EXTERNAL FET)
TPS2391	Simple -48V Hot Swap Controller	HOT SWAP POWER MANAGEMENT- HOT-SWAP CONTROLLERS (EXTERNAL FET)
TPS2392	Full Featured -48V Hot Swap Power Manager, Industrial Temp.	HOT SWAP POWER MANAGEMENT- HOT-SWAP CONTROLLERS (EXTERNAL FET)
TPS2393	Full Featured -48V Hot Swap Power Manager, Industrial Temp.	HOT SWAP POWER MANAGEMENT- HOT-SWAP CONTROLLERS (EXTERNAL FET)
TPS2393A	-48V Hot Swap with Insertion and Removal Detection Delay	HOT SWAP POWER MANAGEMENT- HOT-SWAP CONTROLLERS (EXTERNAL FET)
TPS2398	-48V Hot Swap Controller	HOT SWAP POWER MANAGEMENT- HOT-SWAP CONTROLLERS (EXTERNAL FET)
TPS2399	Simple -48V Hot Swap Controller with Enable	HOT SWAP POWER MANAGEMENT- HOT-SWAP CONTROLLERS (EXTERNAL FET)
TPS2350	Hot Swap Power Manager For Redundant -48V Supplies	HOT SWAP POWER MANAGEMENT- HOT-SWAP CONTROLLERS (EXTERNAL FET)
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UCC2897 Status: ACTIVE

Current Mode Active Clamp PWM Controller

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