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

Customers Who Evaluated This Product Also Evaluated

TL594: Pulse-Width-Modulation (PWM) Control Circuit
SG3524: Regulating Pulse-Width Modulators
TL598: Pulse-Width-Modulation (Pwm) Control Circuit
TPS54620: 4.5V to 17V Input, 6A Synchronous Step Down SWIFT™ Converter
TPS54160: 3.5V to 60V, 1.5A Step Down SWIFT™ Converter with Eco-Mode™
TL431B: Adjustable Precision Shunt 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.

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
TL494CD	ACTIVE	0 to 70	0.25 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE	Purchase Samples
TL494CDBR	ACTIVE	0 to 70	0.28 \| 1ku	SSOP (DB) \| 16	View	2000 \| LARGE T&R	Purchase Samples
TL494CDBRE4	ACTIVE	0 to 70	0.28 \| 1ku	SSOP (DB) \| 16	View	2000 \| LARGE T&R	Purchase Samples
TL494CDBRG4	ACTIVE	0 to 70	0.28 \| 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	0.25 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
TL494CDRE4	ACTIVE	0 to 70	0.25 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
TL494CDRG4	ACTIVE	0 to 70	0.25 \| 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	0.30 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE	Contact TI Distributor or Sales Office
TL494CNE4	ACTIVE	0 to 70	0.30 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE	Contact TI Distributor or Sales Office
TL494CNSR	ACTIVE	0 to 70	0.28 \| 1ku	SO (NS) \| 16	View	2000 \| LARGE T&R	Contact TI Distributor or Sales Office
TL494CNSRG4	ACTIVE	0 to 70	0.28 \| 1ku	SO (NS) \| 16	View	2000 \| LARGE T&R	Contact TI Distributor or Sales Office
TL494CPW	ACTIVE	0 to 70	0.28 \| 1ku	TSSOP (PW) \| 16	View	90 \| TUBE	Purchase Samples
TL494CPWE4	ACTIVE	0 to 70	0.28 \| 1ku	TSSOP (PW) \| 16	View	90 \| TUBE	Purchase Samples
TL494CPWG4	ACTIVE	0 to 70	0.28 \| 1ku	TSSOP (PW) \| 16	View	90 \| TUBE	Purchase Samples
TL494CPWLE	OBSOLETE			TSSOP (PW) \| 16	View			Not Available
TL494CPWR	ACTIVE	0 to 70	0.25 \| 1ku	TSSOP (PW) \| 16	View	2000 \| LARGE T&R	Contact TI Distributor or Sales Office
TL494CPWRE4	ACTIVE	0 to 70	0.25 \| 1ku	TSSOP (PW) \| 16	View	2000 \| LARGE T&R	Contact TI Distributor or Sales Office
TL494CPWRG4	ACTIVE	0 to 70	0.25 \| 1ku	TSSOP (PW) \| 16	View	2000 \| LARGE T&R	Contact TI Distributor or Sales Office
TL494ID	ACTIVE	-40 to 85	0.25 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE	Contact TI Distributor or Sales Office
TL494IDE4	ACTIVE	-40 to 85	0.25 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE	Contact TI Distributor or Sales Office
TL494IDG4	ACTIVE	-40 to 85	0.25 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE	Contact TI Distributor or Sales Office
TL494IDR	ACTIVE	-40 to 85	0.25 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
TL494IDRE4	ACTIVE	-40 to 85	0.25 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R
TL494IDRG4	ACTIVE	-40 to 85	0.25 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R
TL494IN	ACTIVE	-40 to 85	0.30 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE	Contact TI Distributor or Sales Office
TL494INE4	ACTIVE	-40 to 85	0.30 \| 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 10:14 AM GMT, 09 Feb 2010
Region	Company	In Stock	Purchase
TI Lead Time*: 20 WeeksTL494CD
Americas	Rochester Electronics	>1k
Asia	Farnell Asia	960
Europe	Arrow Southern Europe	29
	Avnet-SILICA	40
	Farnell	810
Worldwide	DigiKey	Available
TI Lead Time*: 17 WeeksTL494CDBR
Americas	Rochester Electronics	>1k
TI Lead Time*: 17 WeeksTL494CDBRE4
None Reported View Distributors
TI Lead Time*: 17 WeeksTL494CDBRG4
None Reported View Distributors
TI Lead Time*: 20 WeeksTL494CDE4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksTL494CDG4
Asia	Farnell Asia	214
Europe	Farnell	186
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksTL494CDR
Americas	Rochester Electronics	>1k
Asia	WPI	>1k
Europe	Avnet-SILICA	>1k
Worldwide	DigiKey	>1k
TI Lead Time*: 20 WeeksTL494CDRE4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksTL494CDRG4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksTL494CN
Americas	Rochester Electronics	>1k
Asia	Farnell Asia	>1k
Europe	Arrow Northern Europe	18
Europe	Farnell	395
TI Lead Time*: 20 WeeksTL494CNE4
None Reported View Distributors
TI Lead Time*: 20 WeeksTL494CNSR
Asia	Farnell Asia	277
Europe	Farnell	198
TI Lead Time*: 20 WeeksTL494CNSRG4
None Reported View Distributors
TI Lead Time*: 22 WeeksTL494CPW
Americas	Avnet	72
Worldwide	DigiKey	Available
Worldwide	Mouser Electronics	73
TI Lead Time*: 22 WeeksTL494CPWE4
Worldwide	DigiKey	Available
TI Lead Time*: 22 WeeksTL494CPWG4
Worldwide	DigiKey	Available
TI Lead Time*: 22 WeeksTL494CPWR
Worldwide	DigiKey	>1k
TI Lead Time*: 22 WeeksTL494CPWRE4
Worldwide	DigiKey	Available
TI Lead Time*: 22 WeeksTL494CPWRG4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksTL494ID
Americas	Rochester Electronics	200
Asia	Farnell Asia	564
Europe	Arrow Southern Europe	>1k
Europe	Avnet-SILICA	280
Worldwide	DigiKey	>1k
TI Lead Time*: 20 WeeksTL494IDE4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksTL494IDG4
Asia	Farnell Asia	471
Europe	Farnell	366
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksTL494IDR
Europe	Arrow Southern Europe	>1k
Europe	Compel	4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksTL494IDRE4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksTL494IDRG4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksTL494IN
Americas	Rochester Electronics	265
Asia	Farnell Asia	23
Asia	WPI	35
TI Lead Time*: 20 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) 24872 views
28 May 2002 Read Abstract
Understanding Boost Power Stages In Switchmode Power Supplies (HTM, 8 KB) 16443 views
04 Mar 1999 Read Abstract
Understanding Buck Power Stages In Switchmode Power Supplies (HTM, 8 KB) 17094 views
04 Mar 1999 Read Abstract
Off-Line SMPS Failure Modes PWM Switchers and DC-DC Converters (HTM, 8 KB) 7953 views
22 Mar 2000 Read Abstract
Designing Switching Voltage Regulators With the TL494 (Rev. D) (HTM, 8 KB) 27751 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) 35716 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.
Customers Who Evaluated This Product Also Evaluated...
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TL598	Pulse-Width-Modulation (Pwm) Control Circuit	AC/DC AND DC/DC POWER SUPPLIES-PWM POWER SUPPLY CONTROLLERS	TI customers also evaluated this product.
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TPS54231	2A, 28V Input, 570 kHz Step Down SWIFT™ DC/DC Converter with Eco-Mode ™	DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-DOWN REGULATORS	TI customers also evaluated this product.
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TL494 Status: ACTIVE

PWM Control Circuit

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