TL3842B Status: ACTIVE

High-Performance Current-Mode PWM Controller

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Datasheet

High Performance Current-Mode PWM Controllers (Rev. B) (PDF 541 KB)
02 Jul 2007

	TL3842B	TL3843B	TL3844B	TL3845B
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, 8SOIC, 8PDIP
Regulated Outputs(#)	1	1	1	1
	Samples	Samples	Samples	Samples
	Inventory	Inventory	Inventory	Inventory

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TL3842: Current-Mode PWM Controller

Product Information

Features

Low Start-Up Current (<0.5 mA)
Trimmed Oscillator Discharge Current
Current Mode Operation to 500 kHz
Automatic Feed-Forward Compensation
Latching PWM for Cycle-by-Cycle Current Limiting
Internally Trimmed Reference With Undervoltage Lockout
High-Current Totem-Pole Output Undervoltage Lockout With Hysteresis
Double-Pulse Suppression

DESCRIPTION/ORDERING INFORMATION

The TL284xB and TL384xB 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. Internally implemented circuits include an undervoltage lockout (UVLO) and a precision reference that is 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.

The TL284xB and TL384xB series are pin compatible with the standard TL284x and TL384x with the following improvements. The start-up current is specified to be 0.5 mA (max), while the oscillator discharge current is trimmed to 8.3 mA (typ). In addition, during undervoltage lockout conditions, the output has a maximum saturation voltage of 1.2 V while sinking 10 mA (V_CC = 5 V).

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 TLx842B and TLx844B devices make them ideally suited to off-line applications. The corresponding typical thresholds for the TLx843B and TLx845B devices are 8.4 V (on) and 7.6 V (off). The TLx842B and TLx843B devices can operate to duty cycles approaching 100%. A duty-cycle range of 0% to 50% is obtained by the TLx844B and TLx845B by the addition of an internal toggle flip-flop, which blanks the output off every other clock cycle.The TL284xB-series devices are characterized for operation from -40°C to 85°C. The TL384xB-series devices are characterized for operation from 0°C 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
TL3842BD	ACTIVE	0 to 70	0.60 \| 1ku	SOIC (D) \| 14	View	50 \| TUBE
TL3842BD-8	ACTIVE	0 to 70	0.60 \| 1ku	SOIC (D) \| 8	View	75 \| TUBE	Purchase Samples
TL3842BDG4	ACTIVE	0 to 70	0.60 \| 1ku	SOIC (D) \| 14	View	50 \| TUBE
TL3842BDG4-8	ACTIVE	0 to 70	0.60 \| 1ku	SOIC (D) \| 8	View	75 \| TUBE	Purchase Samples
TL3842BDR	ACTIVE	0 to 70	0.55 \| 1ku	SOIC (D) \| 14	View	2500 \| LARGE T&R	Purchase Samples
TL3842BDR-8	ACTIVE	0 to 70	0.55 \| 1ku	SOIC (D) \| 8	View	2500 \| LARGE T&R	Purchase Samples
TL3842BDRG4	ACTIVE	0 to 70	0.55 \| 1ku	SOIC (D) \| 14	View	2500 \| LARGE T&R	Purchase Samples
TL3842BDRG4-8	ACTIVE	0 to 70	0.55 \| 1ku	SOIC (D) \| 8	View	2500 \| LARGE T&R	Purchase Samples
TL3842BP	ACTIVE	0 to 70	0.55 \| 1ku	PDIP (P) \| 8	View	50 \| TUBE	Purchase Samples
TL3842BPE4	ACTIVE	0 to 70	0.55 \| 1ku	PDIP (P) \| 8	View	50 \| 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 10:29 AM GMT, 06 Nov 2009
Region	Company	In Stock	Purchase
TI Lead Time*: 11 WeeksTL3842BD
Americas	Rochester Electronics	>1k
Asia	WPI	114
Worldwide	DigiKey	132
TI Lead Time*: 11 WeeksTL3842BD-8
Americas	Arrow	>1k
	Newark	663
	Rochester Electronics	>1k
Asia	Farnell Asia	663
Asia	WPI	60
Worldwide	Mouser Electronics	144
TI Lead Time*: 11 WeeksTL3842BDG4
Worldwide	DigiKey	Available
TI Lead Time*: 11 WeeksTL3842BDG4-8
None Reported View Distributors
TI Lead Time*: 11 WeeksTL3842BDR
Americas	Arrow	>1k
Europe	Avnet-SILICA	>1k
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksTL3842BDR-8
Europe	Avnet-SILICA	>1k
TI Lead Time*: 11 WeeksTL3842BDRG4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksTL3842BDRG4-8
None Reported View Distributors
TI Lead Time*: 15 WeeksTL3842BP
Americas	Arrow	850
	Newark	49
	Rochester Electronics	850
Asia	Farnell Asia	49
Asia	WPI	115
Worldwide	Mouser Electronics	1
TI Lead Time*: 15 WeeksTL3842BPE4
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
TL3842BD	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL3842BD-8	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL3842BDG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL3842BDG4-8	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL3842BDR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL3842BDR-8	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL3842BDRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL3842BDRG4-8	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL3842BP	Pb-Free (RoHS)	CU NIPDAU	N/A for Pkg Type	View	View
TL3842BPE4	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 TL3842B

Datasheet

High Performance Current-Mode PWM Controllers (Rev. B) (PDF, 541 KB)
02 Jul 2007

Application Notes

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07 Feb 2002 Read Abstract
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View Application Notes for PWM Power Supply Controllers

Customers Who Evaluated This Product Also Evaluated...
Part #	Name	Product Family	Comments
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TL3842B Status: ACTIVE

High-Performance Current-Mode PWM Controller

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