PWM Control Circuit

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 VCC?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 0C to 70. The TL494I is characterized for operation from ?40C to 85C.
By Texas Instruments
Part Manufacturer Description Datasheet Samples
TL494CDBRG4 Texas Instruments IC 0.25 A SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO16, GREEN, PLASTIC, SSOP-16, Switching Regulator or Controller
TL494CNSRG4 Texas Instruments PWM Controller 16-SO 0 to 70
TL494IDG4 Texas Instruments PWM Controller 16-SOIC -40 to 85
TL494Y Texas Instruments 0.25A SWITCHING CONTROLLER, 300kHz SWITCHING FREQ-MAX, UUC16
TL494CDE4 Texas Instruments PWM Control Circuit 16-SOIC 0 to 70
TL494CPW Texas Instruments PWM Controller 16-TSSOP 0 to 70
TL494IDR Texas Instruments PWM Controller 16-SOIC -40 to 85
TL494CDRG3 Texas Instruments PWM Control Circuit 16-SOIC 0 to 70
TL494CDBRE4 Texas Instruments 0.25A SWITCHING CONTROLLER, 300kHz SWITCHING FREQ-MAX, PDSO16, GREEN, PLASTIC, SSOP-16
TL494CNSR Texas Instruments PWM Controller 16-SO 0 to 70
TL494 's PackagesTL494 's pdf datasheet
TL494CD SOIC
TL494CDBR SSOP
TL494CDBRE4 SSOP
TL494CDBRG4 SSOP
TL494CDE4 SOIC
TL494CDG4 SOIC
TL494CDR SOIC
TL494CDRE4 SOIC
TL494CDRG4 SOIC
TL494CJ DIP
TL494CN PDIP
TL494CNE4 PDIP
TL494CNSR SO
TL494CNSRG4 SO
TL494CPW TSSOP
TL494CPWE4 TSSOP
TL494CPWG4 TSSOP
TL494CPWLE TSSOP
TL494CPWR TSSOP
TL494CPWRE4 TSSOP
TL494CPWRG4 TSSOP
TL494ID SOIC
TL494IDE4 SOIC
TL494IDG4 SOIC
TL494IDR SOIC
TL494IDRE4 SOIC
TL494IDRG4 SOIC
TL494IN PDIP
TL494INE4 PDIP
TL494MJ DIP
TL494MJB DIP




TL494 Pinout, Pinouts
TL494 pinout,Pin out
This is one package pinout of TL494,If you need more pinouts please download TL494's pdf datasheet.

TL494 Application circuits
TL494 circuits
This is one application circuit of TL494,If you need more circuits,please download TL494's pdf datasheet.


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