UC2846 Status: ACTIVE

Current Mode PWM Controller

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Datasheet

Current Mode PWM Controller (Rev. A) (uc2846.pdf, 637 KB)
11 Feb 2002 Download

	UC1846	UC2846	UC3846
Topology	Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull	Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull	Boost, Buck, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull
Control Method	Current Mode	Current Mode	Current Mode
Duty Cycle(Max)(%)	50	50	50
PWM Outputs(#)	2	2	2
Frequency(Max)(kHz)	450	450	450
UVLO Thresholds On/Off(V)	7.7/6.95	7.7/6.95	7.7/6.95
Pin/Package	16CDIP,20LCCC	16PDIP,16SOIC,20PLCC	16PDIP,16SOIC,20PLCC
Regulated Outputs(#)	2	2	2
	Samples	Samples	Samples
	Inventory	Inventory	Inventory

Other qualified versions of UC2846

Version	Part Number	Definition
Military	UC2846M	QML certified for Military and Defense Applications

Customers Who Evaluated This Product Also Evaluated

TL3842: Current-Mode PWM Controller
UC3846: Current Mode PWM Controller
UCC28C44: BiCMOS Low-Power Current Mode PWM Controller
UC2854B: Enhanced High Power Factor Preregulator
LM4040C50: 5-V Precision Micropower Shunt Voltage Reference, 0.5% accuracy
TL431A: Adjustable Precision Shunt Regulator

More Related Products

Product Information

Features

Automatic Feed Forward Compensation
Programmable Pulse-by-Pulse Current Limiting
Automatic Symmetry Correction in Push-pull Configuration
Enhanced Load Response Characteristics
Parallel Operation Capability for Modular Power Systems
Differential Current Sense Amplifier with Wide Common Mode Range
Double Pulse Suppression
500mA (Peak) Totem-pole Outputs
±1% Bandgap Reference
Under-voltage Lockout
Soft Start Capability
Shutdown Terminal
500kHZ Operation

Description

The UC1846/7 family of control ICs provides all of the necessary features to implement fixed frequency, current mode control schemes while maintaining a minimum external parts count. The superior performance of this technique can be measured in improved line regulation, enhanced load response characteristics, and a simpler, easier-to-design control loop. Topological advantages include inherent pulse-by-pulse current limiting capability, automatic symmetry correction for push-pull converters, and the ability to parallel "power modules" while maintaining equal current sharing.

Protection circuitry includes built-in under-voltage lockout and programmable current limit in addition to soft start capability. A shut-down function is also available which can initiate either a complete shutdown with automatic restart or latch the supply off.

Other features include fully latched operation, double pulse suppression, deadline adjust capability, and a ±1% trimmed bandgap reference.

The UC1846 features low outputs in the OFF state, while the UC1847 features high outputs in the OFF state.

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
UC2846DW	ACTIVE	-40 to 85	2.10 \| 100u	SOIC (DW) \| 16	View	40 \| TUBE
UC2846DWG4	ACTIVE	-40 to 85	2.10 \| 100u	SOIC (DW) \| 16	View	40 \| TUBE
UC2846DWTR	ACTIVE	-40 to 85	2.20 \| 100u	SOIC (DW) \| 16	View	2000 \| LARGE T&R	Purchase Samples
UC2846DWTR/81265	OBSOLETE			SOIC (DW) \| 16	View				Not Available
UC2846DWTR/81265G4	OBSOLETE			SOIC (DW) \| 16	View				Not Available
UC2846DWTRG4	ACTIVE	-40 to 85	2.20 \| 100u	SOIC (DW) \| 16	View	2000 \| LARGE T&R	Purchase Samples
UC2846N	ACTIVE	-40 to 85	2.10 \| 100u	PDIP (N) \| 16	View	25 \| TUBE
UC2846NG4	ACTIVE	-40 to 85	2.10 \| 100u	PDIP (N) \| 16	View	25 \| TUBE
UC2846QTR	ACTIVE	-40 to 85	2.20 \| 100u	PLCC (FN) \| 20	View	1000 \| LARGE T&R	Purchase Samples
UC2846QTRG3	ACTIVE	-40 to 85	2.20 \| 100u	PLCC (FN) \| 20	View	1000 \| 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

	TI Inventory Status			Reported Distributor Inventory
UC2846DW	As of 8:49 AM GMT, 20 Nov 2008			As of 8:49 AM GMT, 20 Nov 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	2894 \| 18 Dec	4 Weeks	Americas	Arrow	644
		>10k \| 2 Jan			Avnet	>1k
					DigiKey	655
					Mouser Electronics	280
					Newark	528
					Rochester Electronics	>1k
				Europe	Arrow Southern Europe	240
					Avnet-SILICA	389
					Spoerle	200
UC2846DWG4	As of 8:49 AM GMT, 20 Nov 2008			As of 8:49 AM GMT, 20 Nov 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	2894 \| 18 Dec	4 Weeks	Europe	EBV Elektronik	>1k
	0*	>10k \| 2 Jan	4 Weeks	Europe	Farnell	9
UC2846DWTR	As of 8:49 AM GMT, 20 Nov 2008			As of 8:49 AM GMT, 20 Nov 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	>10k \| 18 Dec	4 Weeks	Europe	Spoerle	>1k
UC2846DWTR/81265	As of 8:49 AM GMT, 20 Nov 2008			As of 8:49 AM GMT, 20 Nov 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*		Call**	Americas	Rochester Electronics	>1k
UC2846DWTRG4	As of 8:49 AM GMT, 20 Nov 2008			As of 8:49 AM GMT, 20 Nov 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	>10k \| 18 Dec	4 Weeks	None Reported View Distributors
UC2846N	As of 8:49 AM GMT, 20 Nov 2008			As of 8:49 AM GMT, 20 Nov 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	>10k \| 2 Jan	8 Weeks	Americas	Arrow	373
					Avnet	657
					DigiKey	>1k
					Mouser Electronics	117
					Newark	322
					Rochester Electronics	>1k
				Asia	WPI	11
				Europe	Avnet-SILICA	>1k
				Europe	Spoerle	800
UC2846NG4	As of 8:49 AM GMT, 20 Nov 2008			As of 8:49 AM GMT, 20 Nov 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	>10k \| 2 Jan	8 Weeks	Europe	EBV Elektronik	>1k
	0*		8 Weeks	Europe	Farnell	40
UC2846QTR	As of 8:49 AM GMT, 20 Nov 2008			As of 8:49 AM GMT, 20 Nov 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	>10k \| 3 Dec	4 Weeks	Americas	Rochester Electronics	>1k
UC2846QTRG3	As of 8:49 AM GMT, 20 Nov 2008			As of 8:49 AM GMT, 20 Nov 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	>10k \| 3 Dec	4 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
UC2846DW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC2846DWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC2846DWTR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC2846DWTRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC2846N	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type	View	View
UC2846NG4	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type	View	View
UC2846QTR	Green (RoHS & no Sb/Br)	CU SN	Level-2-260C-1 YEAR	View	View
UC2846QTRG3	Green (RoHS & no Sb/Br)	CU SN	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

Current Mode PWM Controller (Rev. A) (uc2846.pdf, 637 KB)
11 Feb 2002 Download

Application Notes

U-93 A New Integrated Circuit for Current Mode Control (slua075.htm, 8 KB)
05 Sep 1999 Abstract
DN-62 Switching Power Supply Topology Voltage Mode vs. Current Mode (slua119.htm, 8 KB)
05 Sep 1999 Abstract
Modeling, Analysis and Compensation of the Current-Mode Converter (slua101.htm, 8 KB)
05 Sep 1999 Abstract
DN-45 UC3846, UC3856 and UCC3806 Push Pull PWM Current Mode Control ICs (slua178.htm, 8 KB)
05 Sep 1999 Abstract

View Application Notes for PWM Power Supply Controllers

User Guides

View User Guides for PWM Power Supply Controllers

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