UC3842BNG: Overview,parameter,Main uses,Features,application fields,working principle and alternative models

UC3842BNG Detailed Introduction:


The UC3842BNG is a pulse-width modulation (PWM) controller IC used in power supply applications to regulate the output voltage with high efficiency and accuracy.



  • Input Voltage Range: Typically specified by the power supply design.
  • Output Voltage: Regulated voltage level.
  • Frequency Range: Operating frequency of the PWM control.
  • Current Capacity: Maximum current capability.
  • Package Type: Physical packaging of the IC.
  • DataSheet UC3842BNG PDF

Main Uses:

  • Switch Mode Power Supplies: Control and regulate power output.
  • Voltage Regulators: Maintain stable voltage levels.
  • Battery Chargers: Manage charging processes efficiently.


  • PWM Control: Regulates output through pulse-width modulation.
  • Feedback Mechanism: Maintains output voltage stability.
  • Under Voltage Lockout: Protects against input voltage drops.
  • Soft Start Function: Gentle power-up to prevent voltage surges.
  • Overcurrent Protection: Safeguards against excessive current flow.

Application Fields:

  • Power Electronics: Regulating power in various systems.
  • Electric Vehicles: In power management and charging systems.
  • Renewable Energy: Control components in solar or wind power systems.
  • Industrial Automation: Regulating voltages in machinery and equipment.

Working Principle:

  1. Error Amplification: Compares actual output with desired reference voltage.
  2. PWM Generation: Adjusts the pulse width based on error amplification.
  3. Drive Signal Production: Generates a signal to control power switches.
  4. Output Regulation: Stabilizes the output voltage through feedback mechanisms.

Alternative Models:

  • UC3845: Higher current capability version of the UC3842.
  • SG3524: Another popular PWM controller IC with similar functionalities.
  • TL494: Widely used in switch mode power supplies for similar applications.

The UC3842BNG is a versatile PWM controller commonly employed in power supply designs due to its efficiency, regulation capabilities, and protections. For detailed technical specifications and further alternatives, reference the manufacturer's datasheet and explore similar ICs for various performance requirements in power supply applications.

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