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UC3843BD Specifications

Detailed technical information and Application Scenarios

Product Details

PartNumberManufactorQuantityAvailability
UC3843BDST500Yes

UC3843BD is a high-performance current-mode PWM controller manufactured by ON Semiconductor.

The UC3843BD is a high-performance current-mode PWM controller manufactured by ON Semiconductor.

Specifications:

  • Input Voltage (VCC): 8.5V to 30V
  • Operating Frequency: Up to 500kHz
  • Output Duty Cycle: 0% to 100%
  • Output Current (Peak): ±1A
  • Reference Voltage: 5V (±1% tolerance)
  • Low Startup Current: <1mA
  • Undervoltage Lockout (UVLO): 8.4V (on) / 7.6V (off)
  • Package: SOIC-8

Descriptions:

The UC3843BD is designed for DC-DC converter applications, providing precise control for switching power supplies. It features a trimmed oscillator for accurate duty cycle control, current sensing, and a totem-pole output stage for driving power MOSFETs.

Features:

  • Current-Mode Operation for improved loop response
  • Automatic Feed-Forward Compensation
  • Latching PWM for cycle-by-cycle current limiting
  • Internal Soft-Start
  • High-Current Totem-Pole Output
  • Low RO (Output Impedance) for fast switching
  • Under-Voltage Lockout (UVLO) with hysteresis

This IC is widely used in offline and DC-DC converters, battery chargers, and power supply applications.

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