HLF UC3844 / UC2844 – Current-Mode PWM Controller (DIP8) Input Voltage: 16V – 30V | Operating Temperature: 0°C to +70°C (UC3844), –40°C to +85°C (UC2844) | Through-Hole Package

The HLF UC3844 / UC2844 (DIP8) is a high-performance current-mode PWM controller optimized for off-line and DC-DC converter applications. Designed for enhanced efficiency and precision control, it features a 50% maximum duty cycle, making it ideal for single-ended power supply topologies.
It integrates a 5V precision reference, high-speed error amplifier, and totem-pole output driver capable of driving power MOSFETs directly.

Key Features:

• Function: Current-Mode PWM Controller

• Input Voltage Range: 16V – 30V

• Operating Temperature:

  • UC3844: 0°C to +70°C

  • UC2844: –40°C to +85°C

• Package Type: DIP8 (Dual In-line Package)

• Mounting Type: Through-Hole

• Precision 5V Reference (±1%)

• Low Start-Up Current (0.17 mA typical)

• 50% Maximum Duty Cycle for Controlled Operation

• Under-Voltage Lockout (UVLO)

• Totem-Pole Output for MOSFET Drive

• Fixed Frequency (Typically 100 kHz)

• Excellent Line and Load Regulation

Applications:

• Off-Line Switch-Mode Power Supplies (SMPS)

• DC-DC Converters

• Flyback and Forward Converter Designs

• LED Drivers and Battery Chargers

• Industrial and Consumer Electronics