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UC3843B Specifications

Detailed technical information and Application Scenarios

Product Details

PartNumberManufactorQuantityAvailability
UC3843BPROMAX-JOM213Yes

UC3843B is a high-performance current-mode PWM controller manufactured by Motorola (MOT).

The UC3843B is a high-performance current-mode PWM controller manufactured by Motorola (MOT).

Specifications:

  • Topology: Current-mode PWM control
  • Operating Frequency: Up to 500 kHz
  • Output Drive: Single-ended output (suitable for driving MOSFETs)
  • Duty Cycle Range: 0% to 100%
  • Supply Voltage (VCC): 8V to 30V
  • Start-up Current: Typically 0.5 mA
  • Under-Voltage Lockout (UVLO): 8.4V (on) / 7.6V (off)
  • Peak Output Current: ±1A (sink/source)
  • Error Amplifier Bandwidth: 1 MHz
  • Reference Voltage (VREF): 5V (±1%)
  • Operating Temperature Range: -40°C to +85°C

Descriptions:

The UC3843B is designed for DC-DC converter applications, providing precise control for power supplies. It features a trimmed oscillator for accurate frequency control, a temperature-compensated reference, and a high-gain error amplifier.

Features:

  • Current-Mode Operation: Improves loop response and simplifies compensation.
  • Automatic Feed-Forward Compensation: Enhances line regulation.
  • Latching PWM: Ensures single-pulse operation per cycle.
  • Undervoltage Lockout (UVLO): Ensures reliable start-up and shutdown.
  • High-Current Totem Pole Output: Directly drives power MOSFETs.
  • Cycle-by-Cycle Current Limiting: Protects against overloads.
  • Low Start-up and Operating Current: Improves efficiency.

This IC is commonly used in flyback, forward, and boost converters.

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