UC3846 Status: ACTIVE

Current Mode PWM Controller

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Datasheet

Current Mode PWM Controller (Rev. A) (PDF 637 KB)
11 Feb 2002

	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 UC3846

Version	Part Number	Definition
Catalog	UC3846M	TI's standard catalog product
Enhanced Product	UC1846-EP	Supports Defense, Aerospace and Medical Applications
Military	UC1846	QML certified for Military and Defense Applications
Space	UC1846-SP	Radiation tolerant, ceramic packaging and qualified for use in Space-based application

Customers Who Evaluated This Product Also Evaluated

UC3856: Improved Current Mode PWM Controller
UC3825: High Speed PWM Controller
UC2846: Current Mode PWM Controller
TPS61165: High Brightness White LED Driver in 2mm x 2mm QFN Package
TPS3809K33: 3-Pin Supply Voltage Supervisor
TPS2553: Adjustable, Active High, Constant-Current, Current-Limited Power-Distribution Switch

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.

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
UC3846DW	ACTIVE	0 to 70	1.75 \| 1ku	SOIC (DW) \| 16	View	40 \| TUBE
UC3846DWG4	ACTIVE	0 to 70	1.75 \| 1ku	SOIC (DW) \| 16	View	40 \| TUBE
UC3846DWTR	ACTIVE	0 to 70	1.70 \| 1ku	SOIC (DW) \| 16	View	2000 \| LARGE T&R	Purchase Samples
UC3846DWTRG4	ACTIVE	0 to 70	1.70 \| 1ku	SOIC (DW) \| 16	View	2000 \| LARGE T&R	Purchase Samples
UC3846N	ACTIVE	0 to 70	1.75 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE
UC3846NG4	ACTIVE	0 to 70	1.75 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE
UC3846Q	ACTIVE	0 to 70	2.10 \| 1ku	PLCC (FN) \| 20	View	46 \| TUBE	Purchase Samples
UC3846QG3	ACTIVE	0 to 70	2.10 \| 1ku	PLCC (FN) \| 20	View	46 \| TUBE	Purchase Samples
UC3846QTR	ACTIVE	0 to 70	1.70 \| 1ku	PLCC (FN) \| 20	View	1000 \| LARGE T&R	Purchase Samples
UC3846QTRG3	ACTIVE	0 to 70	1.70 \| 1ku	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

Reported Distributor Inventory as of 9:52 AM GMT, 20 Nov 2009
Region	Company	In Stock	Purchase
TI Lead Time*: 20 WeeksUC3846DW
Americas	Arrow	3
	Avnet	40
	Rochester Electronics	>1k
Asia	WPI	182
Europe	Avnet-SILICA	600
Worldwide	DigiKey	82
TI Lead Time*: 20 WeeksUC3846DWG4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksUC3846DWTR
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksUC3846DWTRG4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksUC3846N
Americas	Arrow	859
	Newark	982
	Rochester Electronics	>1k
Asia	Farnell Asia	123
Asia	WPI	28
Europe	Avnet-SILICA	>1k
Europe	Farnell	108
Worldwide	Mouser Electronics	346
TI Lead Time*: 20 WeeksUC3846NG4
Worldwide	Mouser Electronics	64
TI Lead Time*: 4 WeeksUC3846Q
Americas	Rochester Electronics	>1k
Worldwide	Mouser Electronics	31
TI Lead Time*: 4 WeeksUC3846QG3
None Reported View Distributors
TI Lead Time*: 4 WeeksUC3846QTR
None Reported View Distributors
TI Lead Time*: 4 WeeksUC3846QTRG3
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
UC3846DW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC3846DWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC3846DWTR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC3846DWTRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC3846N	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type	View	View
UC3846NG4	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type	View	View
UC3846Q	Green (RoHS & no Sb/Br)	CU SN	Level-2-260C-1 YEAR	View	View
UC3846QG3	Green (RoHS & no Sb/Br)	CU SN	Level-2-260C-1 YEAR	View	View
UC3846QTR	Green (RoHS & no Sb/Br)	CU SN	Level-2-260C-1 YEAR	View	View
UC3846QTRG3	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

Most useful technical documents for UC3846

Datasheet

Current Mode PWM Controller (Rev. A) (PDF, 637 KB)
11 Feb 2002

Application Notes

U-93 A New Integrated Circuit for Current Mode Control (HTM, 8 KB) 5580 views
05 Sep 1999 Read Abstract
DN-62 Switching Power Supply Topology Voltage Mode vs. Current Mode (HTM, 8 KB) 20123 views
05 Sep 1999 Read Abstract
Modeling, Analysis and Compensation of the Current-Mode Converter (HTM, 8 KB) 6574 views
05 Sep 1999 Read Abstract
DN-45 UC3846, UC3856 and UCC3806 Push Pull PWM Current Mode Control ICs (HTM, 8 KB) 8189 views
05 Sep 1999 Read Abstract
U-100A UC3842/3/4/5 Provides Low-Cost Current-Mode Control (HTM, 9 KB) 21371 views
05 Sep 1999 Read Abstract

View Application Notes for PWM Power Supply Controllers

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UC3846 Status: ACTIVE

Current Mode PWM Controller

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