HLF UC3843 / UC2843 – Current-Mode PWM Controller (DIP8) Input Voltage: 8.4V – 30V | Operating Temperature: 0°C to +70°C (UC3843), –40°C to +85°C (UC2843) | Through-Hole Package

The HLF UC3843 / UC2843 (DIP8) is a high-performance current-mode PWM controller designed for off-line and DC-DC converter applications. Featuring a low start-up voltage (8.4V) and fast transient response, this controller provides high efficiency and stable operation over a wide input range.
It integrates a precision 5V reference, error amplifier, and high-current totem-pole output stage, ensuring reliable power switch control with minimal external components.

Key Features:

• Function: Current-Mode PWM Controller

• Input Voltage Range: 8.4V – 30V

• Operating Temperature:

  • UC3843: 0°C to +70°C

  • UC2843: –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)

• Totem-Pole Output for Direct MOSFET Drive

• Under-Voltage Lockout (UVLO)

• Fixed Frequency (Typically 100 kHz)

• Fast Transient Response and Excellent Line Regulation

Applications:

• DC-DC Converters

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

• LED Drivers and Battery Chargers

• Consumer and Industrial Electronics