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TL494CN

SMPS Controller
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Manufacturer
TI [Texas Instruments]
ONSEMI [ON Semiconductor]
FAIRCHILD Semiconductor
MOTOROLA [Motorola, Inc]
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 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 0°C to 70°C. The TL494I is characterized for operation from –40°C to 85°C.

 

 

TL494CN 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
Parametrics
Maximum Supply voltage VCC41 V
Maximum Amplifier input voltage VIVCC + 0.3 V
Maximum Collector output voltage VO41 V
Maximum Collector output voltage VO250 mA
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds260 °C
Storage Temperature TSTG-65 to 150 °C
Oscillator frequency fOSC1 to 300 kHz
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