Fiche : [DATA055]

Titre : TL494, Pulse-width-modulation (PWM) control circuit, Texas Instruments.

Cité dans : [DIV126]  T. LEQUEU, Librairie des fichiers PDF de composants, octobre 2022.
Cité dans : [DIV199]  Application Note MOTOROLA - ON Semiconductor, septembre 2012.
Cité dans : [DIV095]  Librairie TEXAS INSTRUMENTS - UNITRODE et Notes d'applications diverses, octobre 2013.
Cité dans : [DIV300]  Informations diverses sur les Circuits de commande et drivers pour l'Electronique de Puissance, janvier 2009.

Stockage : Thierry LEQUEU
Lien : TL494.HTM - 24 Ko.

Vers : Description
Vers : Features
Vers : Datasheets
Vers : Application Reports

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.

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

Datasheets

  [1] :  [DIV126]  T. LEQUEU, Librairie des fichiers PDF de composants, octobre 2022.

Application Reports

  [1] :  [DATA056] SLVA001A, Designing switching voltage regulators with TL494, Application report, Texas Instruments.
  [2] :  [DATA057] E. ROGERS, SLVA061 - Understanding boost power stages in switchmode power supplies, Application report , Texas Instruments, march 1999.
  [3] :  [DIV207]  E. ROGERS, SLVA057 - Understanding Buck Power Stages In Switchmode Power Supplies, 31 pages.
  [4] :  [DIV208]  E. ROGERS, SLVA059 - Understanding Buck-Boost Power Stages In Switchmode Power Supplies, 36 pages.

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