HLF UC3843 / UC2843 – Current-Mode PWM Controller (SOP8) Input Voltage: 8.4V – 30V | Operating Temperature: 0°C to +70°C (UC3843), –40°C to +85°C (UC2843) | Surface-Mount Package

The HLF UC3843 / UC2843 (SOP8) is a compact, surface-mount current-mode PWM controller offering fast performance and low power consumption. Designed for efficient power conversion in modern SMPS and DC-DC circuits, it operates with a low start-up voltage (8.4V) and features a precision 5V reference, error amplifier, and high-speed totem-pole output stage for MOSFET drive capability.

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: SOP8 (Small Outline Package)

• Mounting Type: Surface-Mount

• Low Start-Up Current (0.17 mA typical)

• Precision 5V Reference (±1%)

• Under-Voltage Lockout (UVLO)

• Fixed Frequency (~100 kHz)

• High-Speed MOSFET Drive Capability

• Fast Transient Response and Low Standby Loss

Applications:

• DC-DC Converters

• Portable and Compact SMPS Designs

• Battery Management and LED Drivers

• Consumer and Industrial Power Systems