AC/DC and DC/DC Power Supplies - PWM Power Supply Controllers - UC2843A

Most Popular Links

Samples
Pricing/Packaging
Technical Documents

Features
Related Products
Tools & Software

Inventory
Symbols/Footprints
Quality & Pb-Free Data

Application Notes
Reference Designs
Support & Community

Datasheet

Current Mode PWM Controller (Rev. B) (PDF 3638 KB)
04 Sep 2009

Functional Block Diagram

Enlarge

	UC1843A	UC2843A	UC3843A
Topology	Boost, Flyback, Forward	Boost, Flyback, Forward	Boost, Buck, Flyback, Forward
Control Method	Current Mode	Current Mode	Current Mode
Duty Cycle(Max)(%)	100	100	100
PWM Outputs(#)	1	1	1
Frequency(Max)(kHz)	450	450	450
UVLO Thresholds On/Off(V)	8.4/7.6	8.4/7.6	8.4/7.6
Pin/Package	20LCCC, 8CDIP	14SOIC, 20PLCC, 8PDIP, 8SOIC	14SOIC, 8PDIP, 8SOIC
Regulated Outputs(#)	1	1	1
	Samples	Samples	Samples
	Inventory	Inventory	Inventory

Other qualified versions of UC2843A

Version	Part Number	Definition
Automotive	UC2843A-Q1	Q100 devices qualified for high-reliability automotive applications targeting zero defects

Customers Who Evaluated This Product Also Evaluated

UC2843: Current-Mode PWM Controller
TL2844B: High-Performance Current-Mode PWM Controller
TPS3809K33: 3-Pin Supply Voltage Supervisor
TPS5430: 5.5V to 36V, 3A, 500kHz Step Down SWIFT™ Converter
TPS2331: 3-13V Single Hot-Swap IC w/ Power Good Report, Act-High Enable

Product Information

Features

Optimized for Off-line and DC to DC Converters
Low Start Up Current (<0.5mA)
Trimmed Oscillator Discharge Current
Automatic Feed Forward Compensation
Pulse-by-Pulse Current Limiting
Enhanced Load Response Characteristics
Under-Voltage Lockout With Hysteresis
Double Pulse Suppression
High Current Totem Pole Output
Internally Trimmed Bandgap Reference
500kHz Operation
Low RO Error Amp

Description

The UC1842A/3A/4A/5A family of control ICs is a pin for pin compatible improved version of the UC3842/3/4/5 family. Providing the necessary features to control current mode switched mode power supplies, this family has the following improved features. Start up current is guaranteed to be less than 0.5mA. Oscillator discharge is trimmed to 8.3mA. During under voltage lockout, the output stage can sink at least 10mA at less than 1.2V for V_CC over 5V.

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
UC2843AD	ACTIVE	-40 to 85	1.00 \| 1ku	SOIC (D) \| 14	View	50 \| TUBE
UC2843AD8	ACTIVE	-40 to 85	1.00 \| 1ku	SOIC (D) \| 8	View	75 \| TUBE
UC2843AD8G4	ACTIVE	-40 to 85	1.00 \| 1ku	SOIC (D) \| 8	View	75 \| TUBE
UC2843AD8TR	ACTIVE	-40 to 85	0.99 \| 1ku	SOIC (D) \| 8	View	2500 \| LARGE T&R	Purchase Samples
UC2843AD8TRG4	ACTIVE	-40 to 85	0.99 \| 1ku	SOIC (D) \| 8	View	2500 \| LARGE T&R	Purchase Samples
UC2843ADG4	ACTIVE	-40 to 85	1.00 \| 1ku	SOIC (D) \| 14	View	50 \| TUBE
UC2843ADTR	ACTIVE	-40 to 85	0.99 \| 1ku	SOIC (D) \| 14	View	2500 \| LARGE T&R	Purchase Samples
UC2843ADTRG4	ACTIVE	-40 to 85	0.99 \| 1ku	SOIC (D) \| 14	View	2500 \| LARGE T&R	Purchase Samples
UC2843AJ	OBSOLETE	-40 to 85		CDIP (JG) \| 8	View				Not Available
UC2843AN	ACTIVE	-40 to 85	1.00 \| 1ku	PDIP (P) \| 8	View	50 \| TUBE
UC2843ANG4	ACTIVE	-40 to 85	1.00 \| 1ku	PDIP (P) \| 8	View	50 \| TUBE
UC2843AQ	ACTIVE	-40 to 85	1.15 \| 1ku	PLCC (FN) \| 20	View	46 \| TUBE	Purchase Samples
UC2843AQG3	ACTIVE	-40 to 85	1.15 \| 1ku	PLCC (FN) \| 20	View	46 \| TUBE	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 9:54 AM GMT, 20 Nov 2009
Region	Company	In Stock	Purchase
TI Lead Time*: 20 WeeksUC2843AD
Americas	Arrow	550
Americas	Rochester Electronics	610
Asia	Farnell Asia	50
Europe	EBV Elektronik	9
Europe	Farnell	35
Worldwide	Mouser Electronics	67
TI Lead Time*: 20 WeeksUC2843AD8
Americas	Arrow	>1k
	Avnet	206
	Newark	>1k
	Rochester Electronics	>1k
Worldwide	DigiKey	>1k
TI Lead Time*: 20 WeeksUC2843AD8G4
Europe	EBV Elektronik	>1k
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksUC2843AD8TR
Americas	Arrow	>1k
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksUC2843AD8TRG4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksUC2843ADG4
Europe	Compel	803
Europe	EBV Elektronik	4
Worldwide	Mouser Electronics	281
TI Lead Time*: 20 WeeksUC2843ADTR
Americas	Rochester Electronics	>1k
TI Lead Time*: 20 WeeksUC2843ADTRG4
None Reported View Distributors
Call**UC2843AJ
Americas	Rochester Electronics	231
TI Lead Time*: 20 WeeksUC2843AN
Americas	Rochester Electronics	>1k
Asia	WPI	13
Europe	Abacus Polar	250
Europe	Avnet-SILICA	250
Worldwide	DigiKey	113
TI Lead Time*: 20 WeeksUC2843ANG4
Americas	Rochester Electronics	200
Asia	Farnell Asia	400
Europe	EBV Elektronik	>1k
Europe	Farnell	380
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksUC2843AQ
Americas	Arrow	31
Americas	Rochester Electronics	414
TI Lead Time*: 20 WeeksUC2843AQG3
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
UC2843AD	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC2843AD8	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC2843AD8G4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC2843AD8TR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC2843AD8TRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC2843ADG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC2843ADTR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC2843ADTRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC2843AN	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type	View	View
UC2843ANG4	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type	View	View
UC2843AQ	Green (RoHS & no Sb/Br)	CU SN	Level-2-260C-1 YEAR	View	View
UC2843AQG3	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 UC2843A

Datasheet

Current Mode PWM Controller (Rev. B) (PDF, 3638 KB)
04 Sep 2009

Application Notes

Conditioning a Switch-mode Power Supply Current Signal Using TI Op Amps (HTM, 8 KB) 6704 views
23 Mar 2000 Read Abstract
Understanding Buck-Boost Power Stages in Switchmode Power Supplies (Rev. A) (HTM, 8 KB) 23186 views
28 May 2002 Read Abstract
UCC38C42 Family of High-Speed BiCMOS Current-Mode PWM Controllers (HTM, 8 KB) 11083 views
07 Feb 2002 Read Abstract
U-111, Practical Considerations in Current Mode Power Supplies (HTM, 8 KB) 11926 views
05 Sep 1999 Read Abstract
DN-40 The Effects of Oscillator Discharge Current Variations on Maximum Duty (HTM, 8 KB) 3179 views
05 Sep 1999 Read Abstract
DN-26 UC3842A Low-Cost Start-up and Fault Protection Circuit (HTM, 8 KB) 7362 views
05 Sep 1999 Read Abstract
DN-27 UC1842/UC1842A Family - Summary of Functional Differences (HTM, 8 KB) 3777 views
05 Sep 1999 Read Abstract
DN-29 UC3842A Family - Frequency Foldback Technique Provides Protection (HTM, 8 KB) 3567 views
05 Sep 1999 Read Abstract
DN-30 Programmable Electronic Circuit Breaker (HTM, 8 KB) 3068 views
05 Sep 1999 Read Abstract
DN-42A Design Considerations for Transitioning from UC3842 to the New UCC3802 (HTM, 8 KB) 5710 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
UC2843	Current-Mode PWM Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
TL2844B	High-Performance Current-Mode PWM Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
TPS3809K33	3-Pin Supply Voltage Supervisor	POWER MANAGEMENT-SUPERVISORY CIRCUITS(VOLTAGE SUPERVISORS)	TI customers also evaluated this product.
TPS5430	5.5V to 36V, 3A, 500kHz Step Down SWIFT™ Converter	DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-DOWN REGULATORS	TI customers also evaluated this product.
TPS2331	3-13V Single Hot-Swap IC w/ Power Good Report, Act-High Enable	HOT SWAP POWER MANAGEMENT-HOT-SWAP CONTROLLERS (EXTERNAL FET)	TI customers also evaluated this product.
TPS51116	DDR1, DDR2, DDR3 Switcher and LDO	NON-ISOLATED SWITCHING DC/DC REGULATORS-DC/DC CONTROLLERS (EXTERNAL SWITCH)	TI customers also evaluated this product.
TPS650240	Power Management ICs for Li-Ion Powered Systems	POWER MANAGEMENT MULTI-CHANNEL IC (PMIC) SOLUTIONS-PMIC SOLUTIONS WITH AND WITHOUT BATTERY CHARGER	TI customers also evaluated this product.
TLV431B	Low-Voltage Adjustable Precision Shunt Regulator	VOLTAGE REFERENCE-SHUNT VOLTAGE REFERENCE	TI customers also evaluated this product.
BQ24070	Li-Ion Charger with Dynamic Power-Path Management, Output regulated to 4.4V	BATTERY MANAGEMENT-BATTERY CHARGE MANAGEMENT	TI customers also evaluated this product.
TPS54232	2A, 28V Input, 1 MHz Step Down SWIFT™ DC/DC Converter with Eco-Mode™	DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-DOWN REGULATORS	TI customers also evaluated this product.
TL780-12	3 Pin 1.5A Fixed 12V Positive Voltage Regulator	LINEAR REGULATORS-STANDARD VOLTAGE REGULATORS	TI customers also evaluated this product.
TL780-05	3 Pin 1.5A Fixed 5V Positive Voltage Regulator	LINEAR REGULATORS-STANDARD VOLTAGE REGULATORS	TI customers also evaluated this product.

UC2843A Status: ACTIVE

Current Mode PWM Controller

Most Popular Links

Datasheet

Functional Block Diagram

Other qualified versions of UC2843A

Customers Who Evaluated This Product Also Evaluated

Product Information

Features

Description

Pricing / Packaging / CAD Design Tools / Samples

Inventory

Quality & Lead (Pb)-Free Data

Technical Documents

Datasheet

Application Notes

Support and Community

Customer Tags

Other Support

UC2843A Status: ACTIVE

Current Mode PWM Controller

Most Popular Links

Datasheet

Functional Block Diagram

Other qualified versions of UC2843A

Customers Who Evaluated This Product Also Evaluated

Product Information

Features

Description

Pricing / Packaging / CAD Design Tools / Samples

Inventory

Quality & Lead (Pb)-Free Data

Technical Documents

Datasheet

Application Notes

Related Products

Support and Community

Customer Tags

Other Support