TL494 Status: ACTIVE

PWM Control Circuit

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Datasheet

TL494 (Rev. E) (PDF 656 KB)
31 Jan 2005

	TL494
Topology	Boost, Buck, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull
Control Method	Voltage Mode
Duty Cycle(Max)(%)	45
PWM Outputs(#)	2
Frequency(Max)(kHz)	300
Pin/Package	16PDIP, 16SO, 16SOIC, 16SSOP, 16TSSOP
Regulated Outputs(#)	2
	Samples
	Inventory

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TPS51100: 3A Source/Sink DDR terminator Regulator
LM317: 3/4 Pin 1.5A Adjustable Positive Voltage Regulator

Product Information

Features

Complete PWM Power-Control Circuitry
Uncommitted Outputs for 200-mA Sink or Source Current
Output Control Selects Single-Ended or Push-Pull Operation
Internal Circuitry Prohibits Double Pulse at Either Output
Variable Dead Time Provides Control Over Total Range
Internal Regulator Provides a Stable 5-V Reference Supply With 5% Tolerance
Circuit Architecture Allows Easy Synchronization

Description

The TL494 incorporates all the functions required in the construction of a pulse-width-modulation (PWM) control circuit on a single chip. Designed primarily for power-supply control, this device offers the flexibility to tailor the power-supply control circuitry to a specific application.

The TL494 contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, a 5-V, 5%-precision regulator, and output-control circuits.

The error amplifiers exhibit a common-mode voltage range from –0.3 V to V_CC–2 V. The dead-time control comparator has a fixed offset that provides approximately 5% dead time. The on-chip oscillator can be bypassed by terminating RT to the reference output and providing a sawtooth input to CT, or it can drive the common circuits in synchronous multiple-rail power supplies.

The uncommitted output transistors provide either common-emitter or emitter-follower output capability. The TL494 provides for push-pull or single-ended output operation, which can be selected through the output-control function. The architecture of this device prohibits the possibility of either output being pulsed twice during push-pull operation.

The TL494C is characterized for operation from 0°C to 70°. The TL494I is characterized for operation from –40°C to 85°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
TL494CD	ACTIVE	0 to 70	0.25 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE	Purchase Samples
TL494CDBR	ACTIVE	0 to 70	0.23 \| 1ku	SSOP (DB) \| 16	View	2000 \| LARGE T&R	Purchase Samples
TL494CDBRE4	ACTIVE	0 to 70	0.23 \| 1ku	SSOP (DB) \| 16	View	2000 \| LARGE T&R	Purchase Samples
TL494CDBRG4	ACTIVE	0 to 70	0.23 \| 1ku	SSOP (DB) \| 16	View	2000 \| LARGE T&R	Purchase Samples
TL494CDE4	ACTIVE	0 to 70	0.25 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE	Purchase Samples
TL494CDG4	ACTIVE	0 to 70	0.25 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE	Purchase Samples
TL494CDR	ACTIVE	0 to 70	0.23 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
TL494CDRE4	ACTIVE	0 to 70	0.23 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
TL494CDRG4	ACTIVE	0 to 70	0.23 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
TL494CJ	OBSOLETE			CDIP (J) \| 16				Not Available
TL494CN	ACTIVE	0 to 70	0.23 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE	Contact TI Distributor or Sales Office
TL494CNE4	ACTIVE	0 to 70	0.23 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE	Contact TI Distributor or Sales Office
TL494CNSR	ACTIVE	0 to 70	0.23 \| 1ku	SO (NS) \| 16	View	2000 \| LARGE T&R	Contact TI Distributor or Sales Office
TL494CNSRG4	ACTIVE	0 to 70	0.23 \| 1ku	SO (NS) \| 16	View	2000 \| LARGE T&R	Contact TI Distributor or Sales Office
TL494CPW	ACTIVE	0 to 70	0.23 \| 1ku	TSSOP (PW) \| 16	View	90 \| TUBE	Purchase Samples
TL494CPWE4	ACTIVE	0 to 70	0.23 \| 1ku	TSSOP (PW) \| 16	View	90 \| TUBE	Purchase Samples
TL494CPWG4	ACTIVE	0 to 70	0.23 \| 1ku	TSSOP (PW) \| 16	View	90 \| TUBE	Purchase Samples
TL494CPWLE	OBSOLETE			TSSOP (PW) \| 16	View			Not Available
TL494CPWR	ACTIVE	0 to 70	0.27 \| 1ku	TSSOP (PW) \| 16	View	2000 \| LARGE T&R	Contact TI Distributor or Sales Office
TL494CPWRE4	ACTIVE	0 to 70	0.27 \| 1ku	TSSOP (PW) \| 16	View	2000 \| LARGE T&R	Contact TI Distributor or Sales Office
TL494CPWRG4	ACTIVE	0 to 70	0.27 \| 1ku	TSSOP (PW) \| 16	View	2000 \| LARGE T&R	Contact TI Distributor or Sales Office
TL494ID	ACTIVE	-40 to 85	0.38 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE	Contact TI Distributor or Sales Office
TL494IDE4	ACTIVE	-40 to 85	0.38 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE	Contact TI Distributor or Sales Office
TL494IDG4	ACTIVE	-40 to 85	0.38 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE	Contact TI Distributor or Sales Office
TL494IDR	ACTIVE	-40 to 85	0.34 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
TL494IDRE4	ACTIVE	-40 to 85	0.34 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R
TL494IDRG4	ACTIVE	-40 to 85	0.34 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R
TL494IN	ACTIVE	-40 to 85	0.34 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE	Contact TI Distributor or Sales Office
TL494INE4	ACTIVE	-40 to 85	0.34 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE	Contact TI Distributor or Sales Office
TL494MJ	OBSOLETE	-55 to 125		CDIP (J) \| 16				Not Available
TL494MJB	OBSOLETE	-55 to 125		CDIP (J) \| 16				Not Available

* 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*: 15 WeeksTL494CD
Americas	Newark	558
Americas	Rochester Electronics	>1k
Asia	Farnell Asia	>1k
Europe	Arrow Southern Europe	29
	EBV Elektronik	>1k
	Farnell	363
	Spoerle	>1k
Worldwide	Mouser Electronics	>1k
TI Lead Time*: 15 WeeksTL494CDBR
Americas	Rochester Electronics	>1k
TI Lead Time*: 15 WeeksTL494CDBRE4
None Reported View Distributors
TI Lead Time*: 15 WeeksTL494CDBRG4
None Reported View Distributors
TI Lead Time*: 15 WeeksTL494CDE4
None Reported View Distributors
TI Lead Time*: 15 WeeksTL494CDG4
Asia	Farnell Asia	945
Europe	Farnell	872
TI Lead Time*: 15 WeeksTL494CDR
Americas	Avnet	>1k
Americas	Rochester Electronics	>1k
Asia	WPI	>1k
Europe	Avnet-SILICA	>1k
TI Lead Time*: 15 WeeksTL494CDRE4
None Reported View Distributors
TI Lead Time*: 15 WeeksTL494CDRG4
None Reported View Distributors
TI Lead Time*: 18 WeeksTL494CN
Americas	Arrow	25
Americas	Rochester Electronics	>1k
Asia	Farnell Asia	639
Europe	Arrow Northern Europe	18
	EBV Elektronik	>1k
	Farnell	473
	Spoerle	600
TI Lead Time*: 18 WeeksTL494CNE4
None Reported View Distributors
TI Lead Time*: 15 WeeksTL494CNSR
Asia	Farnell Asia	315
Asia	WPI	>1k
Europe	Farnell	210
Worldwide	Mouser Electronics	15
TI Lead Time*: 15 WeeksTL494CNSRG4
Worldwide	Mouser Electronics	693
TI Lead Time*: 20 WeeksTL494CPW
Americas	Avnet	>1k
TI Lead Time*: 20 WeeksTL494CPWE4
None Reported View Distributors
TI Lead Time*: 20 WeeksTL494CPWG4
None Reported View Distributors
TI Lead Time*: 20 WeeksTL494CPWR
Asia	WPI	>1k
TI Lead Time*: 20 WeeksTL494CPWRE4
None Reported View Distributors
TI Lead Time*: 20 WeeksTL494CPWRG4
None Reported View Distributors
TI Lead Time*: 15 WeeksTL494ID
Americas	Arrow	>1k
	Avnet	124
	Newark	764
Asia	Farnell Asia	809
Europe	Arrow Northern Europe	200
	Arrow Southern Europe	>1k
	Avnet-SILICA	800
	Spoerle	>1k
Worldwide	DigiKey	323
Worldwide	Mouser Electronics	331
TI Lead Time*: 15 WeeksTL494IDE4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksTL494IDG4
Asia	Farnell Asia	923
Europe	EBV Elektronik	>1k
Europe	Farnell	850
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksTL494IDR
Americas	Rochester Electronics	>1k
Europe	Arrow Southern Europe	>1k
Europe	Compel	>1k
Worldwide	DigiKey	Available
Worldwide	Mouser Electronics	>1k
TI Lead Time*: 15 WeeksTL494IDRE4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksTL494IDRG4
Worldwide	DigiKey	Available
TI Lead Time*: 18 WeeksTL494IN
Americas	Rochester Electronics	215
Asia	Farnell Asia	45
Europe	Abacus Polar	125
	Arrow Southern Europe	25
	Avnet-SILICA	>1k
	Compel	>1k
	Spoerle	>1k
Worldwide	Mouser Electronics	14
TI Lead Time*: 18 WeeksTL494INE4
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
TL494CD	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL494CDBR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL494CDBRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL494CDBRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL494CDE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL494CDG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL494CDR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL494CDRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL494CDRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL494CN	Pb-Free (RoHS)	CU NIPDAU	N/A for Pkg Type	View	View
TL494CNE4	Pb-Free (RoHS)	CU NIPDAU	N/A for Pkg Type	View	View
TL494CNSR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL494CNSRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL494CPW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL494CPWE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL494CPWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL494CPWR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL494CPWRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL494CPWRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL494ID	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL494IDE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL494IDG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL494IDR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL494IDRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL494IDRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
TL494IN	Pb-Free (RoHS)	CU NIPDAU	N/A for Pkg Type	View	View
TL494INE4	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 TL494

Datasheet

TL494 (Rev. E) (PDF, 656 KB)
31 Jan 2005

Application Notes

Understanding Buck-Boost Power Stages in Switchmode Power Supplies (Rev. A) (HTM, 8 KB) 22870 views
28 May 2002 Read Abstract
Understanding Boost Power Stages In Switchmode Power Supplies (HTM, 8 KB) 15237 views
04 Mar 1999 Read Abstract
Understanding Buck Power Stages In Switchmode Power Supplies (HTM, 8 KB) 15940 views
04 Mar 1999 Read Abstract
Off-Line SMPS Failure Modes PWM Switchers and DC-DC Converters (HTM, 8 KB) 7549 views
22 Mar 2000 Read Abstract
Designing Switching Voltage Regulators With the TL494 (Rev. D) (HTM, 8 KB) 26064 views
31 Jan 2005 Read Abstract

View Application Notes for PWM Power Supply Controllers

Selection Guides

Standard Linear Products Cross-Reference (Rev. D) (PDF, 1169 KB) 32764 views
05 May 2006

Part #	Name	Product Family	Comments
TL594	Pulse-Width-Modulation (PWM) Control Circuit	AC/DC AND DC/DC POWER SUPPLIES - PWM POWER SUPPLY CONTROLLERS	TL594 is similar to the TL494, however, the TL594 features an undervoltage lockout control circuit.
TL3845B	High-Performance Current-Mode PWM Controller	AC/DC AND DC/DC POWER SUPPLIES - PWM POWER SUPPLY CONTROLLERS	The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device. TL384xB include an undervoltage lockout
SG3524	Regulating Pulse-Width Modulators	AC/DC AND DC/DC POWER SUPPLIES - PWM POWER SUPPLY CONTROLLERS	The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.
TL598	Pulse-Width-Modulation (Pwm) Control Circuit	AC/DC AND DC/DC POWER SUPPLIES - PWM POWER SUPPLY CONTROLLERS	The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.
SG2524	Regulating Pulse-Width Modulator	AC/DC AND DC/DC POWER SUPPLIES - PWM POWER SUPPLY CONTROLLERS	The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.
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TL494 Status: ACTIVE

PWM Control Circuit

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