AC/DC and DC/DC Power Supplies - PWM Power Supply Controllers - UC2842A

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

	UC1842A	UC2842A	UC3842A
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)	16/10	16/10	16/10
Pin/Package	20LCCC, 8CDIP	14SOIC, 16SOIC, 8PDIP, 8SOIC	14SOIC, 16SOIC, 8PDIP, 8SOIC
Regulated Outputs(#)	1	1	1
	Samples	Samples	Samples
	Inventory	Inventory	Inventory

Customers Who Evaluated This Product Also Evaluated

UCC3895: BiCMOS Advanced Phase Shift PWM Controller
UC2846: Current Mode PWM Controller
UC2842: Current-Mode PWM Controller
TPS65150: 5V/2A(I/O), 4-CH Multi-Converter w/ VCOM Op-Amp & GPM for LCD Bias, 24 QFN/TSSOP
TPS2384: Quad Ethernet Power Sourcing Equipment Power Manager
TPS51116: DDR1, DDR2, DDR3 Switcher and LDO

More Related Products

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
UC2842AD	ACTIVE	-40 to 85	1.00 \| 1ku	SOIC (D) \| 14	View	50 \| TUBE
UC2842AD8	ACTIVE	-40 to 85	1.00 \| 1ku	SOIC (D) \| 8	View	75 \| TUBE
UC2842AD8G4	ACTIVE	-40 to 85	1.00 \| 1ku	SOIC (D) \| 8	View	75 \| TUBE
UC2842AD8TR	ACTIVE	-40 to 85	0.99 \| 1ku	SOIC (D) \| 8	View	2500 \| LARGE T&R	Purchase Samples
UC2842AD8TRG4	ACTIVE	-40 to 85	0.99 \| 1ku	SOIC (D) \| 8	View	2500 \| LARGE T&R	Purchase Samples
UC2842ADG4	ACTIVE	-40 to 85	1.00 \| 1ku	SOIC (D) \| 14	View	50 \| TUBE
UC2842ADTR	ACTIVE	-40 to 85	0.99 \| 1ku	SOIC (D) \| 14	View	2500 \| LARGE T&R	Purchase Samples
UC2842ADTRG4	ACTIVE	-40 to 85	0.99 \| 1ku	SOIC (D) \| 14	View	2500 \| LARGE T&R	Purchase Samples
UC2842ADW	ACTIVE	-40 to 85	1.15 \| 1ku	SOIC (DW) \| 16	View	40 \| TUBE	Purchase Samples
UC2842ADWG4	ACTIVE	-40 to 85	1.15 \| 1ku	SOIC (DW) \| 16	View	40 \| TUBE	Purchase Samples
UC2842ADWTR	ACTIVE	-40 to 85	0.99 \| 1ku	SOIC (DW) \| 16	View	2000 \| LARGE T&R	Purchase Samples
UC2842ADWTRG4	ACTIVE	-40 to 85	0.99 \| 1ku	SOIC (DW) \| 16	View	2000 \| LARGE T&R	Purchase Samples
UC2842AJ	OBSOLETE	-40 to 85		CDIP (JG) \| 8	View				Not Available
UC2842AN	ACTIVE	-40 to 85	1.00 \| 1ku	PDIP (P) \| 8	View	50 \| TUBE
UC2842ANG4	ACTIVE	-40 to 85	1.00 \| 1ku	PDIP (P) \| 8	View	50 \| TUBE

* 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 9:53 AM GMT, 22 Nov 2009
Region	Company	In Stock	Purchase
TI Lead Time*: 20 WeeksUC2842AD
Americas	Avnet	198
Americas	Rochester Electronics	>1k
Worldwide	DigiKey	75
TI Lead Time*: 20 WeeksUC2842AD8
Americas	Arrow	385
	Newark	198
	Rochester Electronics	>1k
Asia	Farnell Asia	188
Europe	Avnet-SILICA	300
Worldwide	DigiKey	68
Worldwide	Mouser Electronics	215
TI Lead Time*: 20 WeeksUC2842AD8G4
Asia	Farnell Asia	73
Europe	Farnell	23
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksUC2842AD8TR
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksUC2842AD8TRG4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksUC2842ADG4
Asia	Farnell Asia	152
Europe	Compel	3
Europe	Farnell	112
Worldwide	DigiKey	Available
Worldwide	Mouser Electronics	242
TI Lead Time*: 20 WeeksUC2842ADTR
Americas	Avnet	>1k
Europe	Avnet-SILICA	>1k
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksUC2842ADTRG4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksUC2842ADW
Americas	Rochester Electronics	>1k
Worldwide	Mouser Electronics	220
TI Lead Time*: 20 WeeksUC2842ADWG4
None Reported View Distributors
TI Lead Time*: 20 WeeksUC2842ADWTR
None Reported View Distributors
TI Lead Time*: 20 WeeksUC2842ADWTRG4
None Reported View Distributors
TI Lead Time*: 14 WeeksUC2842AN
Americas	Newark	303
Americas	Rochester Electronics	>1k
Asia	Farnell Asia	58
Europe	Farnell	46
TI Lead Time*: 14 WeeksUC2842ANG4
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
UC2842AD	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC2842AD8	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC2842AD8G4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC2842AD8TR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC2842AD8TRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC2842ADG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC2842ADTR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC2842ADTRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC2842ADW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC2842ADWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC2842ADWTR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC2842ADWTRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC2842AN	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type	View	View
UC2842ANG4	Green (RoHS & no Sb/Br)	CU NIPDAU	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 UC2842A

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) 6732 views
23 Mar 2000 Read Abstract
Understanding Buck-Boost Power Stages in Switchmode Power Supplies (Rev. A) (HTM, 8 KB) 23248 views
28 May 2002 Read Abstract
UCC38C42 Family of High-Speed BiCMOS Current-Mode PWM Controllers (HTM, 8 KB) 11113 views
07 Feb 2002 Read Abstract
U-111, Practical Considerations in Current Mode Power Supplies (HTM, 8 KB) 11960 views
05 Sep 1999 Read Abstract
DN-62 Switching Power Supply Topology Voltage Mode vs. Current Mode (HTM, 8 KB) 20171 views
05 Sep 1999 Read Abstract
DN-40 The Effects of Oscillator Discharge Current Variations on Maximum Duty (HTM, 8 KB) 3184 views
05 Sep 1999 Read Abstract
DN-26 UC3842A Low-Cost Start-up and Fault Protection Circuit (HTM, 8 KB) 7378 views
05 Sep 1999 Read Abstract
DN-27 UC1842/UC1842A Family - Summary of Functional Differences (HTM, 8 KB) 3785 views
05 Sep 1999 Read Abstract
DN-29 UC3842A Family - Frequency Foldback Technique Provides Protection (HTM, 8 KB) 3569 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) 5737 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
UCC3895	BiCMOS Advanced Phase Shift PWM Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
UC2846	Current Mode PWM Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
UC2842	Current-Mode PWM Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
UC3846	Current Mode PWM Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
UC2843A	Current Mode PWM Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
TPS65150	5V/2A(I/O), 4-CH Multi-Converter w/ VCOM Op-Amp & GPM for LCD Bias, 24 QFN/TSSOP	LIGHTING AND DISPLAY SOLUTIONS-LCD/OLED DISPLAY BIAS SOLUTIONS	TI customers also evaluated this product.
TPS2384	Quad Ethernet Power Sourcing Equipment Power Manager	POWER OVER ETHERNET/LAN SOLUTIONS-POWER SOURCING EQUIPMENT	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.
UCC27324	Dual 4 A Peak High Speed Low-Side Power MOSFET Drivers	AC/DC AND DC/DC POWER SUPPLIES-MOSFET DRIVERS	TI customers also evaluated this product.
TPS3823-33	Supply Voltage Supervisor w/Watchdog input and manual reset	POWER MANAGEMENT-SUPERVISORY CIRCUITS(VOLTAGE SUPERVISORS)	TI customers also evaluated this product.
UCC28019A	8-Pin Continuous Conduction Mode (CCM) PFC Controller	AC/DC AND DC/DC POWER SUPPLIES-POWER FACTOR CORRECTION ICS	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.
TPS2553	Adjustable, Active High, Constant-Current, Current-Limited Power-Distribution Switch	PCMCIA AND USB-USB POWER SWITCHES	TI customers also evaluated this product.
TPS54140	3.5V to 42V Input, 1.5 A Step Down SWIFT™ Converter with Eco-Mode (tm)	DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-DOWN REGULATORS	TI customers also evaluated this product.
TPS3809K33	3-Pin Supply Voltage Supervisor	POWER MANAGEMENT-SUPERVISORY CIRCUITS(VOLTAGE SUPERVISORS)	TI customers also evaluated this product.

Support and Community

Customer Tags

No Tags are Available for this Part Number

UC2842A Status: ACTIVE

Current Mode PWM Controller

Most Popular Links

Datasheet

Functional Block Diagram

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