TL494IN: Overview,parameter,Main uses,Features,application fields,working principle and alternative models

TL494IN Detailed Introduction:


The TL494IN is a pulse-width modulation (PWM) control circuit that incorporates two error amplifiers, an adjustable oscillator, a dead-time control comparator, a pulse-steering control flip-flop, a precision voltage reference, and a high-current totem pole output stage. This IC is commonly used in power supply applications for controlling the duty cycle of the output signal.



  • Input Voltage: Typically operating within a specified voltage range.
  • Output Current: Maximum load current the IC can handle.
  • Frequency Range: Oscillator frequency range for PWM generation.
  • Duty Cycle Range: Range over which the duty cycle can be adjusted.
  • Voltage Reference: Precision reference voltage for accurate control.

Main Uses:

  • Power Supplies: Controlling switching power supply designs.
  • Voltage Regulators: Regulating output voltages efficiently.
  • Inverters: Driving MOSFETs or IGBTs in inverter applications.
  • Battery Chargers: Regulating charging current and voltage.


  • PWM Control: Provides pulse-width modulation for precise control.
  • Error Amplifiers: Used for comparing the output voltage with a reference.
  • Oscillator: Generates the PWM signal frequency.
  • Dead-Time Control: Regulates the timing between switching transitions.
  • Totem Pole Output: High-current output drivers for driving power components.

Application Fields:

  • Switched-Mode Power Supplies (SMPS): Used in various types of power supply designs.
  • Motor Control: Driving motors in various speed control applications.
  • Battery Management Systems: Regulating charging and discharging processes.
  • DC-DC Converters: Controlling voltage conversion efficiently.

Working Principle:

  1. Error Amplifiers: These compare the output voltage with a reference voltage.
  2. Oscillator: Generates a triangular wave used for PWM.
  3. Dead-Time Control: Regulates timing between switches to prevent shoot-through.
  4. Output Stage: Drives external power components like MOSFETs.
  5. Feedback Loop: Ensures stable regulation of the output voltage.

Alternative Models:

  • SG3524: Similar PWM controller IC with adjustable frequency and duty cycle.
  • UC3842: Current-mode PWM controller offering high-performance regulation.
  • LM339: Quad voltage comparator used in various control applications.

The TL494IN is a versatile PWM control IC commonly used in SMPS, motor control, and voltage regulation applications due to its precision control features and reliability. For detailed specifications and design considerations, refer to the official datasheet provided by the manufacturer.

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