The SG3525AN is an integrated circuit (IC) manufactured by STMicroelectronics. It is a versatile PWM (Pulse Width Modulation) controller that is commonly used in power electronics and voltage regulation circuits. Here is a breakdown of the key features, applications, and specifications of the SG3525AN IC based on the information available:


SG3525AN Overview:

  • Manufacturer: STMicroelectronics
  • IC Type: PWM Controller
  • Package: 16-pin DIP (Dual Inline Package)
  • Topology: Buck/Boost (Forward/Reverse), Push-Pull
  • DataSheet SG3525AN PDF


  • Operating Voltage: Typically operates within a wide voltage range.
  • Operating Temperature: Standard operating temperature range.
  • Pin Configuration: Contains multiple pins for various functions like error amplifiers, feedback loops, PWM outputs, etc.

Main Features:

  • PWM Generation: Generates pulse-width modulated signals for controlling power devices like MOSFETs or IGBTs.
  • Regulation Control: Provides regulation and control functions for voltage regulation circuits.
  • Error Amplifiers: Typically includes error amplifiers for comparing reference voltage with feedback signals.
  • Soft Start Function: May include soft start capabilities to limit inrush current during startup.
  • External Component Interface: Requires external components for setting frequency, duty cycle, and other parameters.

Application Fields:

  • Switched-Mode Power Supplies (SMPS): Used in various types of power supplies for regulating output voltage.
  • Inverters: Employed in DC to AC inverters for applications like motor drives and uninterruptible power supplies (UPS).
  • Voltage Regulators: Utilized in circuits requiring precise voltage regulation and control.
  • Power Converters: Suitable for various power conversion applications requiring PWM control.

Working Principle:

  • The SG3525AN generates PWM signals based on the comparison of a reference voltage with feedback signals.
  • By adjusting the duty cycle of the PWM signal, the IC controls the output voltage or current of the power electronics circuit.
  • It can work in configurations like buck, boost (forward, reverse) or push-pull depending on the application requirements.


  • The SG3525AN is a reliable and widely-used PWM controller IC in various power electronics applications.
  • Detailed application notes, circuit diagrams, and specifications can be found in the manufacturer's datasheet for precise implementation guidelines.

The SG3525AN IC from STMicroelectronics is integral in power supply and power conversion applications, providing PWM control, regulation functionalities, and flexibility in designing voltage regulation circuits based on buck/boost or push-pull configurations. Ensure to consult the datasheet for comprehensive details on pin configurations, operating parameters, and design considerations when utilizing the SG3525AN in your circuit designs.

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