AC/DC and DC/DC Power Supplies - PWM Power Supply Controllers - TL3845

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Datasheet

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

	TL3842	TL3843	TL3844	TL3845
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, 8SOIC, 8PDIP	14SOIC, 8PDIP, 8SOIC	14SOIC, 8PDIP, 8SOIC	14SOIC, 8PDIP, 8SOIC
Regulated Outputs(#)	1	1	1	1
	Samples	Samples	Samples	Samples
	Inventory	Inventory	Inventory	Inventory

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.

View All Description in Datasheet

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
TL3845D	ACTIVE	0 to 70	0.40 \| 1ku	SOIC (D) \| 14	View	50 \| TUBE	Purchase Samples
TL3845D-8	ACTIVE	0 to 70	0.40 \| 1ku	SOIC (D) \| 8	View	75 \| TUBE	Purchase Samples
TL3845DE4	ACTIVE	0 to 70	0.40 \| 1ku	SOIC (D) \| 14	View	50 \| TUBE	Purchase Samples
TL3845DE4-8	ACTIVE	0 to 70	0.40 \| 1ku	SOIC (D) \| 8	View	75 \| TUBE	Purchase Samples
TL3845DG4	ACTIVE	0 to 70	0.40 \| 1ku	SOIC (D) \| 14	View	50 \| TUBE	Purchase Samples
TL3845DG4-8	ACTIVE	0 to 70	0.40 \| 1ku	SOIC (D) \| 8	View	75 \| TUBE	Purchase Samples
TL3845DR	ACTIVE	0 to 70	0.40 \| 1ku	SOIC (D) \| 14	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
TL3845DR-8	ACTIVE	0 to 70	0.40 \| 1ku	SOIC (D) \| 8	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
TL3845DRE4	ACTIVE	0 to 70	0.40 \| 1ku	SOIC (D) \| 14	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
TL3845DRE4-8	ACTIVE	0 to 70	0.40 \| 1ku	SOIC (D) \| 8	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
TL3845DRG4	ACTIVE	0 to 70	0.40 \| 1ku	SOIC (D) \| 14	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
TL3845DRG4-8	ACTIVE	0 to 70	0.40 \| 1ku	SOIC (D) \| 8	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
TL3845P	ACTIVE	0 to 70	0.40 \| 1ku	PDIP (P) \| 8	View	50 \| TUBE	Contact TI Distributor or Sales Office
TL3845PE4	ACTIVE	0 to 70	0.40 \| 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 10:40 AM GMT, 22 Nov 2009
Region	Company	In Stock	Purchase
TI Lead Time*: 18 WeeksTL3845D
Europe	EBV Elektronik	50
Europe	Spoerle	>1k
TI Lead Time*: 15 WeeksTL3845D-8
Americas	Arrow	803
Americas	Rochester Electronics	>1k
Worldwide	DigiKey	Available
Worldwide	Mouser Electronics	33
TI Lead Time*: 18 WeeksTL3845DE4
None Reported View Distributors
TI Lead Time*: 15 WeeksTL3845DE4-8
Worldwide	DigiKey	Available
TI Lead Time*: 18 WeeksTL3845DG4
None Reported View Distributors
TI Lead Time*: 15 WeeksTL3845DG4-8
Worldwide	DigiKey	Available
TI Lead Time*: 18 WeeksTL3845DR
Americas	Rochester Electronics	>1k
Europe	Arrow Southern Europe	>1k
Worldwide	Mouser Electronics	>1k
TI Lead Time*: 15 WeeksTL3845DR-8
Americas	Rochester Electronics	>1k
Worldwide	DigiKey	84
Worldwide	Mouser Electronics	>1k
TI Lead Time*: 18 WeeksTL3845DRE4
None Reported View Distributors
TI Lead Time*: 15 WeeksTL3845DRE4-8
Worldwide	DigiKey	Available
TI Lead Time*: 18 WeeksTL3845DRG4
None Reported View Distributors
TI Lead Time*: 15 WeeksTL3845DRG4-8
Worldwide	DigiKey	Available
TI Lead Time*: 18 WeeksTL3845P
Americas	Newark	192
Americas	Rochester Electronics	>1k
Asia	Farnell Asia	96
Asia	Wintech	>1k
Europe	Avnet-SILICA	250
TI Lead Time*: 18 WeeksTL3845PE4
Americas	Avnet	>1k
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
TL3845D	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL3845D-8	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL3845DE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL3845DE4-8	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL3845DG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL3845DG4-8	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL3845DR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL3845DR-8	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL3845DRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL3845DRE4-8	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL3845DRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL3845DRG4-8	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL3845P	Pb-Free (RoHS)	CU NIPDAU	N/A for Pkg Type	View	View
TL3845PE4	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

Most useful technical documents for TL3845

Datasheet

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

Selection Guides

Standard Linear Products Cross-Reference (Rev. D) (PDF, 1169 KB) 33280 views
05 May 2006

Support and Community

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TL3845 Status: ACTIVE

Current-Mode PWM Controller

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