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UC3842 Specifications

Detailed technical information and Application Scenarios

Product Details

PartNumberManufactorQuantityAvailability
UC3842ST132Yes

UC3842 is a high-performance current-mode PWM controller manufactured by LMI (Linear Monolithic Inc.

The UC3842 is a high-performance current-mode PWM controller manufactured by LMI (Linear Monolithic Inc.). Below are its specifications, descriptions, and features based on factual information:

Specifications:

  • Input Voltage Range: 16V to 30V (start-up), 10V to 30V (operating)
  • Output Current: Up to 1A (peak)
  • Switching Frequency: Up to 500kHz (adjustable with external components)
  • Duty Cycle Range: 0% to 100%
  • Reference Voltage: 5V (±1% accuracy)
  • Operating Temperature Range: 0°C to 70°C (commercial grade)
  • Package Options: 8-pin DIP, SOIC

Descriptions:

  • The UC3842 is a fixed-frequency pulse-width modulation (PWM) controller designed for DC-DC converter applications.
  • It operates in current-mode control, providing improved line and load regulation.
  • Includes features like under-voltage lockout (UVLO), cycle-by-cycle current limiting, and a totem-pole output for driving power MOSFETs.

Features:

  • Current-Mode Control: Enhances transient response and simplifies loop compensation.
  • Precision Reference: 5V bandgap reference with tight tolerance.
  • Under-Voltage Lockout (UVLO): Ensures proper start-up and shutdown.
  • Adjustable Oscillator Frequency: Set via external resistor and capacitor.
  • Soft-Start Capability: Reduces inrush current during start-up.
  • Low Start-Up Current: Typically 1mA.
  • High-Current Totem-Pole Output: Directly drives power MOSFETs.

This information is based on the manufacturer's datasheet and technical documentation.

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