Product details

Topology Boost, Duty cycle (Max) (%) 45 Supply voltage (Max) (V) 40 UVLO thresholds on/off (V) Features Adjustable Switching Frequency, Dead Time Control, Error Amplifier, Multi-topology Operating temperature range (C) -40 to 85, 0 to 70 Rating Catalog Frequency (Max) (kHz) 300 Gate drive (Typ) (A) 0.2
Topology Boost, Duty cycle (Max) (%) 45 Supply voltage (Max) (V) 40 UVLO thresholds on/off (V) Features Adjustable Switching Frequency, Dead Time Control, Error Amplifier, Multi-topology Operating temperature range (C) -40 to 85, 0 to 70 Rating Catalog Frequency (Max) (kHz) 300 Gate drive (Typ) (A) 0.2
PDIP (N) 16 181 mm² 19.3 x 9.4 SOIC (D) 16 59 mm² 9.9 x 6 SOP (NS) 16 80 mm² 10.2 x 7.8 TSSOP (PW) 16 22 mm² 4.4 x 5
  • 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 TL494C 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 TL494C 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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Technical documentation

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Type Title Date
* Data sheet TL494 Pulse-Width-Modulation Control Circuits datasheet (Rev. H) 27 Feb 2017
Application note Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) 12 Mar 2019
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Technical article Using error amplifiers to remove error and variance 16 Feb 2016
Application note Isolated Multiple Output Flyback Converter Design Using TL494 18 Jun 2014
Application note Designing Switching Voltage Regulators With the TL494 (Rev. E) 26 Jul 2005
Application note Off-Line SMPS Failure Modes PWM Switchers and DC-DC Converters 22 Mar 2000
Application note Understanding Boost Power Stages In Switchmode Power Supplies 04 Mar 1999
Application note Understanding Buck Power Stages In Switchmode Power Supplies 04 Mar 1999

Design & development

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Reference designs

TIDA-01426 — Reference Design for Line AC Voltage Generation From Low-Voltage DC Source for Sensor Excitation

This reference design demonstrates a method for designers to achieve high-voltage signals that can be used for flame detection using discrete components. The reference design is built with low BOM-cost and small solution size in mind. By using push-pull converter topology, it is possible to achieve (...)
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PDIP (N) 16 View options
SO (NS) 16 View options
SOIC (D) 16 View options
TSSOP (PW) 16 View options

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