UC1846 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 UC1846

Version	Part Number	Definition
Catalog	UC3846	TI's standard catalog product
Enhanced Product	UC1846-EP	Supports Defense, Aerospace and Medical Applications
Space	UC1846-SP	Radiation tolerant, ceramic packaging and qualified for use in Space-based application

Customers Who Evaluated This Product Also Evaluated

UC3846: Current Mode PWM Controller
TL494: PWM Control Circuit
UC1846-SP: Current-Mode PWM Controller

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)	DSCC #	Price \| Quantity	Package \| Pins	Package QTY \| Package Carrier	Symbols	Footprints	Samples
5962-86806012A	ACTIVE	-55 to 125		20.79 \| 100u	LCCC (FK) \| 20	1 \| TUBE	Purchase Samples
5962-8680601EA	ACTIVE	-55 to 125		9.85 \| 100u	CDIP (J) \| 16	1 \| TUBE	Purchase Samples
UC1846J	ACTIVE	-55 to 125		5.91 \| 100u	CDIP (J) \| 16	1 \| TUBE	Contact TI Distributor or Sales Office
UC1846J/80257	OBSOLETE	-55 to 125			CDIP (J) \| 16			Not Available
UC1846J/80364	OBSOLETE	-55 to 125			CDIP (J) \| 16			Not Available
UC1846J/80619	OBSOLETE	-55 to 125			CDIP (J) \| 16			Not Available
UC1846J883B	ACTIVE	-55 to 125	5962-8680601EA	9.85 \| 100u	CDIP (J) \| 16	1 \| TUBE	Contact TI Distributor or Sales Office
UC1846L883B	ACTIVE	-55 to 125	5962-86806012A	20.79 \| 100u	LCCC (FK) \| 20	1 \| TUBE	Contact TI Distributor or Sales Office

* 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 9:51 AM GMT, 08 Nov 2009
Region	Company	In Stock	Purchase
TI Lead Time*: 8 Weeks5962-86806012A
Americas	Arrow	102
Americas	Avnet	78
TI Lead Time*: 8 Weeks5962-8680601EA
Americas	Arrow	433
Europe	Arrow Northern Europe	10
TI Lead Time*: 8 WeeksUC1846J
Americas	Arrow	115
Americas	Avnet	78
Asia	WPI	10
Europe	Arrow Northern Europe	3
	Arrow Southern Europe	21
	Avnet-SILICA	351
	EBV Elektronik	104
Call**UC1846J/80257
Americas	Rochester Electronics	33
Call**UC1846J/80364
Americas	Rochester Electronics	22
TI Lead Time*: 8 WeeksUC1846J883B
Americas	Arrow	42
Europe	Abacus Polar	50
Europe	EBV Elektronik	1
TI Lead Time*: 8 WeeksUC1846L883B
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
5962-86806012A	TBD	POST-PLATE	N/A for Pkg Type	View	View
5962-8680601EA	TBD	A42	N/A for Pkg Type	View	View
UC1846J	TBD	A42	N/A for Pkg Type	View	View
UC1846J883B	TBD	A42	N/A for Pkg Type	View	View
UC1846L883B	TBD	POST-PLATE	N/A for Pkg Type	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 UC1846

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) 5513 views
05 Sep 1999 Read Abstract
DN-62 Switching Power Supply Topology Voltage Mode vs. Current Mode (HTM, 8 KB) 19863 views
05 Sep 1999 Read Abstract
Modeling, Analysis and Compensation of the Current-Mode Converter (HTM, 8 KB) 6490 views
05 Sep 1999 Read Abstract
DN-45 UC3846, UC3856 and UCC3806 Push Pull PWM Current Mode Control ICs (HTM, 8 KB) 8086 views
05 Sep 1999 Read Abstract

View Application Notes for PWM Power Supply Controllers

Customers Who Evaluated This Product Also Evaluated...
Part #	Name	Product Family	Comments
UC3846	Current Mode PWM Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
TL494	PWM Control Circuit	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
UC1846-SP	Current-Mode PWM Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.

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UC1846 Status: ACTIVE

Current-Mode PWM Controller

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