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UC3843AN Specifications

Detailed technical information and Application Scenarios

Product Details

PartNumberManufactorQuantityAvailability
UC3843ANON5000Yes

UC3843AN is a high-performance current-mode PWM controller manufactured by ON Semiconductor.

The UC3843AN is a high-performance current-mode PWM controller manufactured by ON Semiconductor.

Specifications:

  • Input Voltage Range: 8.4V to 30V
  • Operating Frequency: Up to 500kHz
  • Output Current: ±1A (Peak)
  • Duty Cycle Range: 0% to 100%
  • Reference Voltage: 5V (±1%)
  • Low Startup Current: <1mA
  • Undervoltage Lockout (UVLO): 8.4V (on), 7.6V (off)
  • Package: 8-Pin PDIP (Plastic Dual In-Line Package)

Descriptions:

The UC3843AN is designed for DC-DC converter applications, providing precise control in switching power supplies. It features a fixed-frequency current-mode architecture for improved line and load regulation. The device includes a trimmed oscillator, high-gain error amplifier, current sensing comparator, and a totem-pole output stage for driving power MOSFETs.

Features:

  • Current-Mode Operation for enhanced transient response
  • Automatic Feed-Forward Compensation
  • Latching PWM for cycle-by-cycle current limiting
  • Internal Trimmed Bandgap Reference
  • Low Output Resistance (RO) for efficient MOSFET driving
  • Single-Ended Output with high current drive capability

This IC is widely used in offline and DC-DC power supply designs, including flyback, forward, and boost converters.

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