UC3846 Status: ACTIVE

Current Mode PWM Controller

Alert me about changes<br/>to this product

Alert me about changes
to this product

Datasheet

Current Mode PWM Controller (Rev. A) (uc3846.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
	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

UC3843: Current-Mode PWM Controller
UC3856: Improved Current Mode PWM Controller
UCC3895: BiCMOS Advanced Phase Shift PWM Controller
TPS62000: Adjustable, 600-mA, 95% Efficient Step-Down Converter, CSP-12 and MSOP-10
TPS75003: Integrated Triple Supply Power Management IC for Xilinx(R) Spartan(TM)-3 FPGAs
UCC28051: PFC Controller for low to medium power applications requiring compliance with IEC 1000-3-2

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
UC3846DW	ACTIVE	0 to 70	2.00 \| 100u	SOIC (DW) \| 16	View	40 \| TUBE
UC3846DWG4	ACTIVE	0 to 70	2.00 \| 100u	SOIC (DW) \| 16	View	40 \| TUBE
UC3846DWTR	ACTIVE	0 to 70	2.10 \| 100u	SOIC (DW) \| 16	View	2000 \| LARGE T&R	Purchase Samples
UC3846DWTRG4	ACTIVE	0 to 70	2.10 \| 100u	SOIC (DW) \| 16	View	2000 \| LARGE T&R	Purchase Samples
UC3846N	ACTIVE	0 to 70	2.00 \| 100u	PDIP (N) \| 16	View	25 \| TUBE
UC3846NG4	ACTIVE	0 to 70	2.00 \| 100u	PDIP (N) \| 16	View	25 \| TUBE
UC3846Q	ACTIVE	0 to 70	2.00 \| 100u	PLCC (FN) \| 20	View	46 \| TUBE	Purchase Samples
UC3846QG3	ACTIVE	0 to 70	2.00 \| 100u	PLCC (FN) \| 20	View	46 \| TUBE	Purchase Samples
UC3846QTR	ACTIVE	0 to 70	2.10 \| 100u	PLCC (FN) \| 20	View	1000 \| LARGE T&R	Purchase Samples
UC3846QTRG3	ACTIVE	0 to 70	2.10 \| 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
UC3846DW	As of 7:50 AM GMT, 05 Oct 2008			As of 7:50 AM GMT, 05 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	2600 \| 3 Nov	4 Weeks	Americas	Arrow	586
					Avnet	>1k
					DigiKey	>1k
					Newark	703
					Rochester Electronics	>1k
				Europe	Arrow Southern Europe	40
				Europe	Farnell	356
UC3846DWG4	As of 7:50 AM GMT, 05 Oct 2008			As of 7:50 AM GMT, 05 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	2600 \| 3 Nov	4 Weeks	Europe	EBV Elektronik	280
UC3846DWTR	As of 7:50 AM GMT, 05 Oct 2008			As of 7:50 AM GMT, 05 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	3373 \| 3 Nov	6 Weeks	Americas	Arrow	>1k
		>10k \| 18 Nov		Americas	Avnet	>1k
				Asia	WPI	>1k
UC3846DWTRG4	As of 7:50 AM GMT, 05 Oct 2008			As of 7:50 AM GMT, 05 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	3373 \| 3 Nov	6 Weeks	None Reported View Distributors
	0*	>10k \| 18 Nov	6 Weeks
UC3846N	As of 7:50 AM GMT, 05 Oct 2008			As of 7:50 AM GMT, 05 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	101*	>10k \| 17 Nov	6 Weeks	Americas	Arrow	805
					Avnet	>1k
					DigiKey	>1k
					Mouser Electronics	363
					Newark	12
					Rochester Electronics	>1k
				Asia	WPI	15
				Europe	Abacus Polar	10
					Arrow Northern Europe	50
					Arrow Southern Europe	625
					Avnet-SILICA	250
					EBV Elektronik	2
					Farnell	776
UC3846NG4	As of 7:50 AM GMT, 05 Oct 2008			As of 7:50 AM GMT, 05 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	101*	>10k \| 17 Nov	6 Weeks	Americas	Mouser Electronics	130
	101*		6 Weeks	Europe	EBV Elektronik	>1k
UC3846Q	As of 7:50 AM GMT, 05 Oct 2008			As of 7:50 AM GMT, 05 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	506*	3078 \| 1 Dec	6 Weeks	Americas	Mouser Electronics	134
	506*	>10k \| 8 Dec	6 Weeks	Americas	Rochester Electronics	>1k
UC3846QG3	As of 7:50 AM GMT, 05 Oct 2008			As of 7:50 AM GMT, 05 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	506*	3078 \| 1 Dec	6 Weeks	None Reported View Distributors
	506*	>10k \| 8 Dec	6 Weeks
UC3846QTR	As of 7:50 AM GMT, 05 Oct 2008			As of 7:50 AM GMT, 05 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	840 \| 13 Oct	6 Weeks	None Reported View Distributors
		82 \| 27 Oct
		3096 \| 22 Dec
		>10k \| 29 Dec
UC3846QTRG3	As of 7:50 AM GMT, 05 Oct 2008			As of 7:50 AM GMT, 05 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	840 \| 13 Oct	6 Weeks	None Reported View Distributors
		82 \| 27 Oct
		3096 \| 22 Dec
		>10k \| 29 Dec
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
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

Datasheets

Current Mode PWM Controller (Rev. A) (uc3846.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
U-100A UC3842/3/4/5 Provides Low-Cost Current-Mode Control (slua143.htm, 9 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

Alternative Products - Are similar to UC3846
Customers Who Evaluated This Product Also Evaluated...
Part #	Name	Comments
UC3843	Current-Mode PWM Controller	TI customers also evaluated this product.
UC3856	Improved Current Mode PWM Controller	TI customers also evaluated this product.
UCC3895	BiCMOS Advanced Phase Shift PWM Controller	TI customers also evaluated this product.

Complementary Products - Can be used with UC3846
Customers Who Evaluated This Product Also Evaluated...
Part #	Name	Product Family	Comments
TPS62000	Adjustable, 600-mA, 95% Efficient Step-Down Converter, CSP-12 and MSOP-10	DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-DOWN REGULATORS	TI customers also evaluated this product.
TPS75003	Integrated Triple Supply Power Management IC for Xilinx(R) Spartan(TM)-3 FPGAs	POWER MANAGEMENT MULTI-CHANNEL IC (PMIC) SOLUTIONS-PMIC SOLUTIONS FOR ASICs AND FPGAs	TI customers also evaluated this product.
UCC28051	PFC Controller for low to medium power applications requiring compliance with IEC 1000-3-2	AC/DC AND DC/DC POWER SUPPLIES-POWER FACTOR CORRECTION ICS	TI customers also evaluated this product.
TPS28225	8-Pin High Frequency 4-Amp Sink Synchronous MOSFET Driver	AC/DC AND DC/DC POWER SUPPLIES-MOSFET DRIVERS	TI customers also evaluated this product.
TPS54610	Low Input Voltage 6A Synchronous Buck Converter with Adjustable Output Voltage	DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-DOWN REGULATORS	TI customers also evaluated this product.
UCC28060	Natural Interleaved Dual-Phase Transition-Mode PFC Controller	AC/DC AND DC/DC POWER SUPPLIES-POWER FACTOR CORRECTION ICS	TI customers also evaluated this product.
TPS54550	4.5 to 20V Input, 6A Step Down Converter with Adjustable Output Voltage	DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-DOWN REGULATORS	TI customers also evaluated this product.
BQ24032A	Dual Input Li-Ion Charger with Dynamic Power Path, Output regulated to 4.4V, Vbat 4.2V	BATTERY MANAGEMENT-BATTERY CHARGE MANAGEMENT	TI customers also evaluated this product.
TPS73601	Single Output LDO, 400mA, Adj.(1.2 to 5.5V), Cap free, Low Noise, Reverse Current Protection	LINEAR REGULATORS-SINGLE CHANNEL LDO	TI customers also evaluated this product.
BQ24080	Low-Cost 1-cell Li-Ion Charger w/ 1-A FET, AC Present and Charge Enable in QFN-10	BATTERY MANAGEMENT-BATTERY CHARGE MANAGEMENT	TI customers also evaluated this product.

Support and Community

Videos

Laptop-Like Performance at Handheld Power Levels

Added: 7 months ago
Views:202
Duration:00:26
Rating:

Sign in to rate this video

Customer Tags

No Tags are Available for this Part Number

UC3846 Status: ACTIVE

Current Mode PWM Controller

Most Popular Links