HLF UC3842 – Current-Mode PWM Controller (SOP8) Input Voltage: 16V – 30V | Operating Temperature: 0°C to +70°C (UC3842), –40°C to +85°C (UC2842) | Surface-Mount Package

The HLF UC3842 (SOP8) is a high-performance current-mode PWM controller designed for off-line and DC-DC converter applications. It integrates a precision 5V reference, a high-speed error amplifier, and a high-current totem-pole output stage. This controller ensures excellent line and load regulation with minimal external components, making it ideal for compact and efficient power supply designs.

Key Features:

• Function: Current-Mode PWM Controller

• Input Voltage Range: 16V – 30V

• Operating Temperature:

  • UC3842: 0°C to +70°C

  • UC2842: –40°C to +85°C

• Package Type: SOP8

• Mounting Type: Surface-Mount

• Precision 5V Reference (±1%)

• Low Start-Up Current (0.17 mA typical)

• High-Speed Totem-Pole Output for MOSFET Drive

• Undervoltage Lockout (UVLO) Protection

• Fixed Frequency Operation (~100 kHz)

• Current-Mode Control for Fast Transient Response

Applications:

• Off-Line Power Supplies

• DC-DC Converters

• Battery Chargers

• LED Drivers

• Power Adapters