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UC3844A Specifications

Detailed technical information and Application Scenarios

Product Details

PartNumberManufactorQuantityAvailability
UC3844AUC100Yes

UC3844A is a high-performance current-mode PWM controller manufactured by Fairchild Semiconductor (now part of ON Semiconductor).

The UC3844A is a high-performance current-mode PWM controller manufactured by Fairchild Semiconductor (now part of ON Semiconductor).

Specifications:

  • Input Voltage Range: 8V to 30V
  • Operating Frequency: Up to 500kHz
  • Output Duty Cycle: 0% to 100%
  • Output Current (Peak): 1A (sink/source)
  • Reference Voltage: 5V (±1%)
  • Low Startup Current: <1mA
  • Undervoltage Lockout (UVLO): 7.6V (turn-on), 7.2V (turn-off)
  • Current Sense Comparator: Adjustable threshold
  • Error Amplifier Bandwidth: 1MHz
  • Package Options: DIP-8, SOIC-8

Descriptions and Features:

  • Current-Mode Control: Provides improved loop response and simplified compensation.
  • Programmable Oscillator: Allows frequency adjustment with external timing components.
  • Pulse-by-Pulse Current Limiting: Enhances system reliability.
  • Soft-Start Capability: Reduces inrush current during startup.
  • High-Current Totem Pole Output: Directly drives power MOSFETs.
  • Latching PWM for Cycle-by-Cycle Control: Ensures precise regulation.
  • Low Power Consumption: Suitable for energy-efficient designs.

The UC3844A is commonly used in switch-mode power supplies (SMPS), DC-DC converters, and offline power applications.

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