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UC3842A Specifications

Detailed technical information and Application Scenarios

Product Details

PartNumberManufactorQuantityAvailability
UC3842AST440Yes

UC3842A is a high-performance current-mode PWM controller manufactured by STMicroelectronics.

The UC3842A is a high-performance current-mode PWM controller manufactured by STMicroelectronics.

Specifications:

  • Input Voltage (VCC): 8V to 30V (operating range)
  • Under-Voltage Lockout (UVLO): 7.6V (turn-on), 7.2V (turn-off)
  • Output Current (Peak): ±1A (sink/source)
  • Oscillator Frequency Range: Up to 500kHz
  • Duty Cycle Range: 0% to 100%
  • Reference Voltage (VREF): 5V (±1% accuracy)
  • Current Sense Comparator Threshold: 1V
  • Error Amplifier Gain Bandwidth: 1MHz
  • Operating Temperature Range: -40°C to +85°C
  • Package Options: PDIP-8, SO-8

Descriptions:

  • The UC3842A is designed for offline and DC-DC converter applications.
  • It features a trimmed oscillator for precise frequency control.
  • Includes a high-gain error amplifier for voltage regulation.
  • Provides cycle-by-cycle current limiting for protection.

Features:

  • Current-Mode Control: Improves loop response and simplifies compensation.
  • Automatic Feed-Forward Compensation: Enhances line regulation.
  • Pulse-by-Pulse Current Limiting: Prevents transformer saturation.
  • Internal Soft-Start: Reduces inrush current.
  • Low Start-Up Current: Typically 0.5mA.
  • Latching PWM for Overvoltage Protection (OVP).
  • Totem-Pole Output for Direct MOSFET Drive.

For detailed datasheets, refer to STMicroelectronics' official documentation.

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