HLF UC3845 / UC2845 – Current-Mode PWM Controller (DIP8) Input Voltage: 8.4V – 30V | Operating Temperature: 0°C to +70°C (UC3845), –40°C to +85°C (UC2845) | Through-Hole Package

The HLF UC3845 / UC2845 (DIP8) is a high-performance current-mode PWM controller designed for off-line and DC-DC converter applications. This version offers a 50% maximum duty cycle and low start-up voltage (8.4V) for high efficiency in single-ended power topologies. It integrates a precision 5V reference, high-speed error amplifier, and totem-pole output stage for driving power MOSFETs directly.

Key Features:

• Function: Current-Mode PWM Controller

• Input Voltage Range: 8.4V – 30V

• Operating Temperature:

  • UC3845: 0°C to +70°C

  • UC2845: –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

• Under-Voltage Lockout (UVLO)

• Fixed Frequency (Typically 100 kHz)

• High-Speed Totem-Pole Output for MOSFET Drive

• Excellent Line and Load Regulation

Applications:

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

• DC-DC Converters

• Battery Chargers

• LED Power Drivers

• Industrial Control and Consumer Electronics