TL494 Status: ACTIVE

PWM Control Circuit

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Datasheet

TL494 (Rev. E) (PDF 655 KB) 56890 views
31 Jan 2005

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

Customers Who Evaluated This Product Also Evaluated

TL594: Pulse-Width-Modulation (PWM) Control Circuit
UC3843A: Current Mode PWM Controller
SG3524: Regulating Pulse-Width Modulators
TL431A: Adjustable Precision Shunt Regulator
TPS65131: 800mA/1950mA Boost Current w/ Pos.& Neg.(Dual) output for OLED & CCD sensor, 24 QFN
TPS51120: Dual Current Mode, Synch Step-Down Controller With 100-mA Standby Reg For Notebook System Power

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

	TI Inventory Status		Reported Distributor Inventory
TL494CD	As of 9:20 AM GMT, 03 Jul 2009		As of 9:20 AM GMT, 03 Jul 2009
	Lead Time		Region	Company	In Stock	Purchase
	6 Weeks		Americas	Arrow	>1k
				Avnet	638
				DigiKey	Available
				Mouser Electronics	>1k
				Newark	>1k
				Rochester Electronics	>1k
			Europe	Arrow Southern Europe	29
				Avnet-SILICA	>1k
				EBV Elektronik	>1k
				Farnell	697
				Spoerle	>1k
TL494CDBR	As of 9:20 AM GMT, 03 Jul 2009		As of 9:20 AM GMT, 03 Jul 2009
	Lead Time		Region	Company	In Stock	Purchase
	8 Weeks		None Reported View Distributors
TL494CDBRE4	As of 9:20 AM GMT, 03 Jul 2009		As of 9:20 AM GMT, 03 Jul 2009
	Lead Time		Region	Company	In Stock	Purchase
	8 Weeks		None Reported View Distributors
TL494CDBRG4	As of 9:20 AM GMT, 03 Jul 2009		As of 9:20 AM GMT, 03 Jul 2009
	Lead Time		Region	Company	In Stock	Purchase
	8 Weeks		None Reported View Distributors
TL494CDE4	As of 9:20 AM GMT, 03 Jul 2009		As of 9:20 AM GMT, 03 Jul 2009
	Lead Time		Region	Company	In Stock	Purchase
	6 Weeks		Americas	DigiKey	Available
TL494CDG4	As of 9:20 AM GMT, 03 Jul 2009		As of 9:20 AM GMT, 03 Jul 2009
	Lead Time		Region	Company	In Stock	Purchase
	6 Weeks		Americas	DigiKey	Available
	6 Weeks		Europe	Farnell	>1k
TL494CDR	As of 9:20 AM GMT, 03 Jul 2009		As of 9:20 AM GMT, 03 Jul 2009
	Lead Time		Region	Company	In Stock	Purchase
	7 Weeks		Americas	Arrow	>1k
				Avnet	>1k
				DigiKey	>1k
				Mouser Electronics	>1k
				Rochester Electronics	>1k
			Asia	WPI	>1k
			Europe	Avnet-SILICA	>1k
			Europe	EBV Elektronik	>1k
TL494CDRE4	As of 9:20 AM GMT, 03 Jul 2009		As of 9:20 AM GMT, 03 Jul 2009
	Lead Time		Region	Company	In Stock	Purchase
	7 Weeks		Americas	DigiKey	Available
TL494CDRG4	As of 9:20 AM GMT, 03 Jul 2009		As of 9:20 AM GMT, 03 Jul 2009
	Lead Time		Region	Company	In Stock	Purchase
	7 Weeks		Americas	DigiKey	Available
TL494CN	As of 9:20 AM GMT, 03 Jul 2009		As of 9:20 AM GMT, 03 Jul 2009
	Lead Time		Region	Company	In Stock	Purchase
	9 Weeks		Americas	Arrow	>1k
				Avnet	>1k
				DigiKey	567
				Mouser Electronics	666
				Newark	756
				Rochester Electronics	>1k
			Asia	WPI	292
			Europe	Arrow Northern Europe	18
				EBV Elektronik	>1k
				Farnell	669
TL494CNE4	As of 9:20 AM GMT, 03 Jul 2009		As of 9:20 AM GMT, 03 Jul 2009
	Lead Time		Region	Company	In Stock	Purchase
	9 Weeks		Americas	DigiKey	Available
TL494CNSR	As of 9:20 AM GMT, 03 Jul 2009		As of 9:20 AM GMT, 03 Jul 2009
	Lead Time		Region	Company	In Stock	Purchase
	4 Weeks		Americas	DigiKey	>1k
		Mouser Electronics		>1k
		Rochester Electronics		>1k
		Asia	WPI	>1k
		Europe	Farnell	705
TL494CNSRG4	As of 9:20 AM GMT, 03 Jul 2009	As of 9:20 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	4 Weeks	Americas	DigiKey	Available
TL494CPW	As of 9:20 AM GMT, 03 Jul 2009	As of 9:20 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	4 Weeks	Americas	Avnet	>1k
			DigiKey	Available
			Mouser Electronics	>1k
		Europe	EBV Elektronik	810
TL494CPWE4	As of 9:20 AM GMT, 03 Jul 2009	As of 9:20 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	4 Weeks	Americas	DigiKey	Available
TL494CPWG4	As of 9:20 AM GMT, 03 Jul 2009	As of 9:20 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	4 Weeks	Americas	DigiKey	Available
	4 Weeks	Europe	Farnell	841
TL494CPWR	As of 9:20 AM GMT, 03 Jul 2009	As of 9:20 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	14 Weeks	Americas	DigiKey	168
	14 Weeks	Americas	Mouser Electronics	>1k
TL494CPWRE4	As of 9:20 AM GMT, 03 Jul 2009	As of 9:20 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	14 Weeks	Americas	DigiKey	Available
	14 Weeks	Americas	Rochester Electronics	>1k
TL494CPWRG4	As of 9:20 AM GMT, 03 Jul 2009	As of 9:20 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	14 Weeks	Americas	DigiKey	Available
	14 Weeks	Europe	EBV Elektronik	1k
TL494ID	As of 9:20 AM GMT, 03 Jul 2009	As of 9:20 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	6 Weeks	Americas	Arrow	>1k
			Avnet	>1k
			DigiKey	>1k
			Mouser Electronics	382
			Newark	894
		Asia	WPI	46
		Europe	Arrow Northern Europe	720
			Arrow Southern Europe	>1k
			Avnet-SILICA	>1k
			EBV Elektronik	20
			Spoerle	>1k
TL494IDE4	As of 9:20 AM GMT, 03 Jul 2009	As of 9:20 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	6 Weeks	Americas	DigiKey	Available
TL494IDG4	As of 9:20 AM GMT, 03 Jul 2009	As of 9:20 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	6 Weeks	Americas	DigiKey	Available
		Europe	EBV Elektronik	240
		Europe	Farnell	91
TL494IDR	As of 9:20 AM GMT, 03 Jul 2009	As of 9:20 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	6 Weeks	Americas	Arrow	>1k
			DigiKey	946
			Mouser Electronics	>1k
			Rochester Electronics	>1k
		Asia	WPI	>1k
		Europe	Arrow Southern Europe	>1k
			Compel	>1k
			EBV Elektronik	>1k
TL494IDRE4	As of 9:20 AM GMT, 03 Jul 2009	As of 9:20 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	6 Weeks	Americas	DigiKey	Available
TL494IDRG4	As of 9:20 AM GMT, 03 Jul 2009	As of 9:20 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	6 Weeks	Americas	DigiKey	Available
TL494IN	As of 9:20 AM GMT, 03 Jul 2009	As of 9:20 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	9 Weeks	Americas	Arrow	373
			DigiKey	7
			Mouser Electronics	>1k
			Newark	407
			Rochester Electronics	15
		Asia	WPI	59
		Europe	Abacus Polar	125
			Arrow Southern Europe	550
			Avnet-SILICA	50
			Compel	>1k
			EBV Elektronik	>1k
			Farnell	245
			Spoerle	>1k
TL494INE4	As of 9:20 AM GMT, 03 Jul 2009	As of 9:20 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	9 Weeks	Americas	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
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 655 KB) 56890 views
31 Jan 2005

Application Notes

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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) 28683 views
05 May 2006

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