SLVS074J January   1983  – September 2026 TL494

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  Recommended Operating Conditions
    4. 5.4  Thermal Information
    5. 5.5  Electrical Characteristics, Reference Section
    6. 5.6  Electrical Characteristics, Oscillator Section
    7. 5.7  Electrical Characteristics, Error-Amplifier Section
    8. 5.8  Electrical Characteristics, Output Section
    9. 5.9  Electrical Characteristics, Dead-Time Control Section
    10. 5.10 Electrical Characteristics, PWM Comparator Section
    11. 5.11 Electrical Characteristics, Total Device
    12. 5.12 Switching Characteristics
    13. 5.13 Typical Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 5V Reference Regulator
      2. 7.3.2 Oscillator
      3. 7.3.3 Dead-time Control
      4. 7.3.4 Comparator
      5. 7.3.5 Pulse-Width Modulation (PWM)
      6. 7.3.6 Error Amplifiers
      7. 7.3.7 Output-Control Input
      8. 7.3.8 Output Transistors
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Input Power Source
        2. 8.2.2.2 Control Circuits
          1. 8.2.2.2.1 Oscillator
          2. 8.2.2.2.2 Error Amplifier
          3. 8.2.2.2.3 Current-Limiting Amplifier
          4. 8.2.2.2.4 Soft Start and Dead Time
        3. 8.2.2.3 Inductor Calculations
        4. 8.2.2.4 Output Capacitance Calculations
        5. 8.2.2.5 Transistor Power-Switch Calculations
      3. 8.2.3 Application Curves for Output Characteristics
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
        1. 8.4.1.1 Feedback Traces
        2. 8.4.1.2 Input/Output Capacitors
        3. 8.4.1.3 Compensation Components
        4. 8.4.1.4 Traces and Ground Planes
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Documentation Support
      1. 9.3.1 Related Documentation
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.3.7 Output-Control Input

The output-control input determines whether the output transistors operate in parallel or push-pull. This input is the supply source for the pulse-steering flip-flop. The output-control input is asynchronous and has direct control over the output, independent of the oscillator or pulse-steering flip-flop. The input condition is intended to be a fixed condition that the application defines. For parallel operation, ground the output-control input. This disables the pulse-steering flip-flop and inhibits its outputs. In this mode, both output transistors in parallel transmit the pulses seen at the output of the dead-time control/PWM comparator. For push-pull operation, connect the output-control input to the internal 5V reference regulator. Under this condition, each of the output transistors is enabled, alternately, by the pulse-steering flip-flop.