AC/DC and DC/DC Power Supplies - PWM Power Supply Controllers - UC3842A

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Datasheet

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

Functional Block Diagram

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	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

Other qualified versions of UC3842A

Version	Part Number	Definition
Enhanced Product	UC1842A-EP	Supports Defense, Aerospace and Medical Applications
Military	UC1842A	QML certified for Military and Defense Applications
Space	UC1842A-SP	Radiation tolerant, ceramic packaging and qualified for use in Space-based application

Customers Who Evaluated This Product Also Evaluated

TL494: PWM Control Circuit
UCC2895: BiCMOS Advanced Phase Shift Resonant Controller
UCC28C45: BiCMOS Low-Power Current Mode PWM Controller
UCD7100: Digital Control Compatible Single Low-Side +/- 4Amp MOSFET Driver with Current Sense
UCC28019A: 8-Pin Continuous Conduction Mode (CCM) PFC Controller
TPS63000: 96% Buck-Boost Converter with 1.8A Current Switches in 3x3 QFN

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
UC3842AD	ACTIVE	0 to 70	0.85 \| 1ku	SOIC (D) \| 14	View	50 \| TUBE
UC3842AD8	ACTIVE	0 to 70	0.85 \| 1ku	SOIC (D) \| 8	View	75 \| TUBE
UC3842AD8G4	ACTIVE	0 to 70	0.85 \| 1ku	SOIC (D) \| 8	View	75 \| TUBE
UC3842AD8TR	ACTIVE	0 to 70	0.90 \| 1ku	SOIC (D) \| 8	View	2500 \| LARGE T&R	Purchase Samples
UC3842AD8TRG4	ACTIVE	0 to 70	0.90 \| 1ku	SOIC (D) \| 8	View	2500 \| LARGE T&R	Purchase Samples
UC3842ADG4	ACTIVE	0 to 70	0.85 \| 1ku	SOIC (D) \| 14	View	50 \| TUBE
UC3842ADTR	ACTIVE	0 to 70	0.90 \| 1ku	SOIC (D) \| 14	View	2500 \| LARGE T&R	Purchase Samples
UC3842ADTRG4	ACTIVE	0 to 70	0.90 \| 1ku	SOIC (D) \| 14	View	2500 \| LARGE T&R	Purchase Samples
UC3842ADW	ACTIVE	0 to 70	1.05 \| 1ku	SOIC (DW) \| 16	View	40 \| TUBE
UC3842ADWG4	ACTIVE	0 to 70	1.05 \| 1ku	SOIC (DW) \| 16	View	40 \| TUBE
UC3842AN	ACTIVE	0 to 70	1.05 \| 1ku	PDIP (P) \| 8	View	50 \| TUBE
UC3842ANG4	ACTIVE	0 to 70	1.05 \| 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, 26 Nov 2009
Region	Company	In Stock	Purchase
TI Lead Time*: 20 WeeksUC3842AD
Americas	Newark	233
Americas	Rochester Electronics	>1k
Asia	Farnell Asia	150
Asia	WPI	37
Europe	EBV Elektronik	3
Europe	Farnell	111
Worldwide	DigiKey	35
TI Lead Time*: 20 WeeksUC3842AD8
Americas	Newark	>1k
Americas	Rochester Electronics	>1k
Asia	Farnell Asia	339
Asia	WPI	113
Europe	Avnet-SILICA	>1k
	EBV Elektronik	>1k
	Farnell	298
Worldwide	DigiKey	>1k
TI Lead Time*: 20 WeeksUC3842AD8G4
Worldwide	DigiKey	Available
Worldwide	Mouser Electronics	286
TI Lead Time*: 20 WeeksUC3842AD8TR
Americas	Rochester Electronics	>1k
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksUC3842AD8TRG4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksUC3842ADG4
Worldwide	DigiKey	Available
Worldwide	Mouser Electronics	103
TI Lead Time*: 20 WeeksUC3842ADTR
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksUC3842ADTRG4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksUC3842ADW
Americas	Rochester Electronics	>1k
Asia	WPI	411
Worldwide	DigiKey	134
TI Lead Time*: 20 WeeksUC3842ADWG4
Worldwide	DigiKey	Available
Worldwide	Mouser Electronics	346
TI Lead Time*: 20 WeeksUC3842AN
Americas	Arrow	950
	Avnet	459
	Newark	872
	Rochester Electronics	>1k
Asia	Farnell Asia	>1k
Asia	WPI	140
Europe	Abacus Polar	652
	Arrow Northern Europe	68
	Avnet-SILICA	400
	Farnell	170
Worldwide	DigiKey	658
Worldwide	Mouser Electronics	557
TI Lead Time*: 20 WeeksUC3842ANG4
Worldwide	DigiKey	Available
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
UC3842AD	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC3842AD8	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC3842AD8G4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC3842AD8TR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC3842AD8TRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC3842ADG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC3842ADTR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC3842ADTRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC3842ADW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC3842ADWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
UC3842AN	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type	View	View
UC3842ANG4	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 UC3842A

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) 6762 views
23 Mar 2000 Read Abstract
Understanding Buck-Boost Power Stages in Switchmode Power Supplies (Rev. A) (HTM, 8 KB) 23347 views
28 May 2002 Read Abstract
UCC38C42 Family of High-Speed BiCMOS Current-Mode PWM Controllers (HTM, 8 KB) 11143 views
07 Feb 2002 Read Abstract
U-111, Practical Considerations in Current Mode Power Supplies (HTM, 8 KB) 12002 views
05 Sep 1999 Read Abstract
DN-62 Switching Power Supply Topology Voltage Mode vs. Current Mode (HTM, 8 KB) 20246 views
05 Sep 1999 Read Abstract
DN-40 The Effects of Oscillator Discharge Current Variations on Maximum Duty (HTM, 8 KB) 3193 views
05 Sep 1999 Read Abstract
DN-26 UC3842A Low-Cost Start-up and Fault Protection Circuit (HTM, 8 KB) 7394 views
05 Sep 1999 Read Abstract
DN-27 UC1842/UC1842A Family - Summary of Functional Differences (HTM, 8 KB) 3798 views
05 Sep 1999 Read Abstract
DN-29 UC3842A Family - Frequency Foldback Technique Provides Protection (HTM, 8 KB) 3577 views
05 Sep 1999 Read Abstract
DN-30 Programmable Electronic Circuit Breaker (HTM, 8 KB) 3080 views
05 Sep 1999 Read Abstract
DN-42A Design Considerations for Transitioning from UC3842 to the New UCC3802 (HTM, 8 KB) 5776 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
TL494	PWM Control Circuit	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
UCC2895	BiCMOS Advanced Phase Shift Resonant Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
UCC28C45	BiCMOS Low-Power Current Mode PWM Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
UC3844	Current-Mode PWM Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
UCC3895	BiCMOS Advanced Phase Shift PWM Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
UC3843A	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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TPS63000	96% Buck-Boost Converter with 1.8A Current Switches in 3x3 QFN	DC/DC CONVERTERS (INTEGRATED SWITCH)-BUCK-BOOST REGULATORS	TI customers also evaluated this product.
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UC3842A Status: ACTIVE

Current Mode PWM Controller

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Datasheet

Functional Block Diagram

Other qualified versions of UC3842A

Customers Who Evaluated This Product Also Evaluated

Product Information

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Quality & Lead (Pb)-Free Data

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Datasheet

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UC3842A Status: ACTIVE

Current Mode PWM Controller

Most Popular Links

Datasheet

Functional Block Diagram

Other qualified versions of UC3842A

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

Related End Equipments

Support and Community

Customer Tags

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