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TL494

ACTIVO

Controlador PWM de 40 V, 0,2 A y 300 KHz

Detalles del producto

Topology Boost, Buck, Flyback, Push pull, SEPIC Control mode Voltage Features Adjustable switching frequency, Dead time control, Error amplifier, Multi-topology Duty cycle (max) (%) 45
Topology Boost, Buck, Flyback, Push pull, SEPIC Control mode Voltage Features Adjustable switching frequency, Dead time control, Error amplifier, Multi-topology Duty cycle (max) (%) 45
SOIC (D) 16 59.4 mm² (9.9 mm × 6 mm) TSSOP (PW) 16 32 mm² (5 mm × 6.4 mm) PDIP (N) 16 181.42 mm² (19.3 mm × 9.4 mm) SOP (NS) 16 79.56 mm² (10.2 mm × 7.8 mm)
  • 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
  • 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

The TL494 device 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 device 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 device 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 TL494 device is characterized for operation from 0°C to 70°C. The TL494I device is characterized for operation from –40°C to 85°C.

The TL494 device 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 device 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 device 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 TL494 device is characterized for operation from 0°C to 70°C. The TL494I device is characterized for operation from –40°C to 85°C.

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Documentación técnica

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Documentación principal Tipo Título Opciones de formato Descargar la versión más reciente en inglés Fecha
* Hoja de datos TL494 Pulse-Width-Modulation Control Circuits datasheet (Rev. I) PDF | HTML 8/07/2022
Nota sobre la aplicación Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) 12/03/2019
Guía de selección Power Management Guide 2018 (Rev. R) 25/06/2018
Artículo técnico Using error amplifiers to remove error and variance PDF | HTML 16/02/2016
Nota sobre la aplicación Isolated Multiple Output Flyback Converter Design Using TL494 18/06/2014
Nota sobre la aplicación Designing Switching Voltage Regulators With the TL494 (Rev. E) 26/07/2005
Nota sobre la aplicación Off-Line SMPS Failure Modes PWM Switchers and DC-DC Converters 22/03/2000
Nota sobre la aplicación Understanding Buck Power Stages In Switchmode Power Supplies 4/03/1999
Nota sobre la aplicación Understanding Boost Power Stages In Switchmode Power Supplies 4/03/1999

Diseño y desarrollo

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Diseño de referencia

TIDA-01426 — Diseño de referencia para generación de tensión de CA de línea a partir de fuente de CC de baja tens

Este diseño de referencia demuestra un método para que los diseñadores logren señales de alta tensión que se pueden utilizar para la detección de llamas mediante componentes discretos. El diseño de referencia se construye teniendo en cuenta un bajo costo de BOM y un tamaño de solución pequeño. (...)

Productos y hardware compatibles
Encapsulado Pines Símbolos CAD, huellas y modelos 3D
SOIC (D) 16 Ultra Librarian
TSSOP (PW) 16 Ultra Librarian
PDIP (N) 16 Ultra Librarian
SOP (NS) 16 Ultra Librarian

Pedidos y calidad

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