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UC3843AD Specifications

Detailed technical information and Application Scenarios

Product Details

PartNumberManufactorQuantityAvailability
UC3843ADMOTO/UC113Yes

UC3843AD** is a current-mode PWM controller IC manufactured by **Motorola (MOTO)**.

The UC3843AD is a current-mode PWM controller IC manufactured by Motorola (MOTO). Below are its key specifications, descriptions, and features:

Specifications:

  • Manufacturer: Motorola (MOTO)
  • Type: Current-Mode PWM Controller
  • Package: SOIC-8 (DIP-8 also available)
  • Operating Voltage Range: 8.5V to 30V
  • Output Current: 1A (Peak)
  • Switching Frequency: Up to 500kHz
  • Duty Cycle Range: 0% to 100% (adjustable)
  • Reference Voltage: 5V (±1%)
  • Operating Temperature Range: -40°C to +85°C

Descriptions:

  • The UC3843AD is a high-performance fixed-frequency PWM controller optimized for DC-DC converter applications.
  • It operates in current-mode control, providing improved loop response and simplified feedback compensation.
  • Features an undervoltage lockout (UVLO) with hysteresis, ensuring reliable startup and shutdown.
  • Includes a precision 5V reference, error amplifier, and current-sensing comparator for accurate regulation.

Features:

  • Current-Mode Control: Enhances transient response and simplifies loop compensation.
  • Adjustable Oscillator Frequency: Allows flexibility in design.
  • Undervoltage Lockout (UVLO): Ensures proper operation within voltage limits.
  • High-Current Totem Pole Output: Directly drives power MOSFETs.
  • Cycle-by-Cycle Current Limiting: Protects against overloads.
  • Low Startup Current (≤1mA): Reduces power consumption during startup.
  • Internal Trimmed Bandgap Reference: Provides stable 5V reference.

This IC is commonly used in switch-mode power supplies (SMPS), flyback converters, and offline power supplies.

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