TL2842 Status: ACTIVE

Current-Mode PWM Controller

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Datasheet

Current-Mode PWM Controller (Rev. G) (PDF 533 KB)
28 Feb 2008

	TL2842	TL2843	TL2844	TL2845
Topology	Boost, Flyback, Forward	Boost, Flyback, Forward	Boost, Flyback, Forward	Boost, Flyback, Forward
Control Method	Current Mode	Current Mode	Current Mode	Current Mode
Duty Cycle(Max)(%)	100	100	50	50
PWM Outputs(#)	1	1	1	1
Frequency(Max)(kHz)	500	500	500	500
UVLO Thresholds On/Off(V)	16/10	8.4/7.6	16/10	8.4/7.6
Pin/Package	14SOIC, 8PDIP, 8SOIC	14SOIC, 8PDIP, 8SOIC	14SOIC, 8PDIP, 8SOIC	14SOIC, 8PDIP, 8SOIC
Regulated Outputs(#)	1	1	1	1
	Samples	Samples	Samples	Samples
	Inventory	Inventory	Inventory	Inventory

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UC2842A: Current Mode PWM Controller
UCC28610: 12-65W Green-mode Flyback Power Supply Controller
TPS5430-Q1: Automotive Catalog 3-A Wide-Input-Range Step-Down SWIFT™ Converter

Product Information

Features

Optimized for Off-Line and dc-to-dc Converters
Low Start-Up Current (<1 mA)
Automatic Feed-Forward Compensation
Pulse-by-Pulse Current Limiting
Enhanced Load-Response Characteristics
Undervoltage Lockout With Hysteresis
Double-Pulse Suppression
High-Current Totem-Pole Output
Internally Trimmed Bandgap Reference
500-kHz Operation
Error Amplifier With Low Output Resistance
Designed to Be Interchangeable With UC2842 and UC3842 Series

Description

The TL284x and TL384x series of control integrated circuits provide the features that are necessary to implement off-line or dc-to-dc fixed-frequency current-mode control schemes, with a minimum number of external components. Some of the internally implemented circuits are an undervoltage lockout (UVLO), featuring a start-up current of less than 1 mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator (that also provides current-limit control), and a totem-pole output stage designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.

Major differences between members of these series are the UVLO thresholds and maximum duty-cycle ranges. Typical UVLO thresholds of 16 V (on) and 10 V (off) on the TLx842 and TLx844 devices make them ideally suited to off-line applications. The corresponding typical thresholds for the TLx843 and TLx845 devices are 8.4 V (on) and 7.6 V (off). The TLx842 and TLx843 devices can operate to duty cycles approaching 100%. A duty-cycle range of 0 to 50% is obtained by the TLx844 and TLx845 by the addition of an internal toggle flip-flop, which blanks the output off every other clock cycle.

The TL284x-series devices are characterized for operation from –40°C to 85°C. The TL384x devices are characterized for operation from 0° to 70°C.

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
TL2842D	ACTIVE	-40 to 85	0.45 \| 1ku	SOIC (D) \| 14	View	50 \| TUBE	Purchase Samples
TL2842D-8	ACTIVE	-40 to 85	0.49 \| 1ku	SOIC (D) \| 8	View	75 \| TUBE	Purchase Samples
TL2842DE4	ACTIVE	-40 to 85	0.45 \| 1ku	SOIC (D) \| 14	View	50 \| TUBE	Purchase Samples
TL2842DE4-8	ACTIVE	-40 to 85	0.49 \| 1ku	SOIC (D) \| 8	View	75 \| TUBE	Purchase Samples
TL2842DG4	ACTIVE	-40 to 85	0.45 \| 1ku	SOIC (D) \| 14	View	50 \| TUBE	Purchase Samples
TL2842DG4-8	ACTIVE	-40 to 85	0.49 \| 1ku	SOIC (D) \| 8	View	75 \| TUBE	Purchase Samples
TL2842DR	ACTIVE	-40 to 85	0.45 \| 1ku	SOIC (D) \| 14	View	2500 \| LARGE T&R	Purchase Samples
TL2842DR-8	ACTIVE	-40 to 85	0.45 \| 1ku	SOIC (D) \| 8	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
TL2842DRE4	ACTIVE	-40 to 85	0.45 \| 1ku	SOIC (D) \| 14	View	2500 \| LARGE T&R	Purchase Samples
TL2842DRE4-8	ACTIVE	-40 to 85	0.45 \| 1ku	SOIC (D) \| 8	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
TL2842DRG4	ACTIVE	-40 to 85	0.45 \| 1ku	SOIC (D) \| 14	View	2500 \| LARGE T&R	Purchase Samples
TL2842DRG4-8	ACTIVE	-40 to 85	0.45 \| 1ku	SOIC (D) \| 8	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
TL2842P	ACTIVE	-40 to 85	0.45 \| 1ku	PDIP (P) \| 8	View	50 \| TUBE	Contact TI Distributor or Sales Office
TL2842PE4	ACTIVE	-40 to 85	0.45 \| 1ku	PDIP (P) \| 8	View	50 \| 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 10:36 AM GMT, 08 Nov 2009
Region	Company	In Stock	Purchase
TI Lead Time*: 14 WeeksTL2842D
Europe	Spoerle	550
TI Lead Time*: 15 WeeksTL2842D-8
Americas	Rochester Electronics	>1k
Worldwide	DigiKey	Available
Worldwide	Mouser Electronics	>1k
TI Lead Time*: 14 WeeksTL2842DE4
None Reported View Distributors
TI Lead Time*: 15 WeeksTL2842DE4-8
Worldwide	DigiKey	Available
Worldwide	Mouser Electronics	338
TI Lead Time*: 14 WeeksTL2842DG4
None Reported View Distributors
TI Lead Time*: 15 WeeksTL2842DG4-8
Worldwide	DigiKey	Available
TI Lead Time*: 18 WeeksTL2842DR
Americas	Rochester Electronics	>1k
TI Lead Time*: 15 WeeksTL2842DR-8
Worldwide	DigiKey	>1k
TI Lead Time*: 18 WeeksTL2842DRE4
None Reported View Distributors
TI Lead Time*: 15 WeeksTL2842DRE4-8
Worldwide	DigiKey	Available
TI Lead Time*: 18 WeeksTL2842DRG4
None Reported View Distributors
TI Lead Time*: 15 WeeksTL2842DRG4-8
Worldwide	DigiKey	Available
TI Lead Time*: 18 WeeksTL2842P
Americas	Newark	933
Americas	Rochester Electronics	>1k
Asia	WPI	500
Europe	Avnet-SILICA	250
Europe	EBV Elektronik	400
Worldwide	DigiKey	117
Worldwide	Mouser Electronics	150
TI Lead Time*: 18 WeeksTL2842PE4
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
TL2842D	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
TL2842D-8	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
TL2842DE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
TL2842DE4-8	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
TL2842DG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
TL2842DG4-8	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
TL2842DR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
TL2842DR-8	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
TL2842DRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
TL2842DRE4-8	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
TL2842DRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
TL2842DRG4-8	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
TL2842P	Pb-Free (RoHS)	CU NIPDAU	N/A for Pkg Type	View	View
TL2842PE4	Pb-Free (RoHS)	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

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Customers Who Evaluated This Product Also Evaluated...
Part #	Name	Product Family	Comments
UC2842A	Current Mode PWM Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
UCC28610	12-65W Green-mode Flyback Power Supply Controller	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
TPS5430-Q1	Automotive Catalog 3-A Wide-Input-Range Step-Down SWIFT™ Converter	DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-DOWN REGULATORS	TI customers also evaluated this product.

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TL2842 Status: ACTIVE

Current-Mode PWM Controller

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