HLF UC3842 – Current-Mode PWM Controller (DIP8) Input Voltage: 16V – 30V | Operating Temperature: 0°C to +70°C | Through-Hole Package

The HLF UC3842 (DIP8) is a high-performance current-mode PWM controller designed for off-line and DC-DC converter applications. It integrates a high-gain error amplifier, a precision voltage reference, and a high-current totem-pole output stage, providing excellent line and load regulation.

This controller ensures stable operation with minimal external components, making it ideal for switch-mode power supplies (SMPS) and AC-DC converters. Its current-mode control improves transient response and simplifies loop compensation, while built-in protections enhance reliability.

Key Features:

• Function: Current-Mode PWM Controller

• Input Voltage Range: 16V – 30V

• Operating Temperature Range: 0°C to +70°C

• Package Type: DIP8

• Mounting Type: Through-Hole

• Precision 5V Reference Voltage (±1%)

• High-Speed Totem-Pole Output

• Low Start-Up Current (0.17 mA typical)

• Built-in Undervoltage Lockout (UVLO)

• Current-Mode Control for Fast Response

• Fixed Operating Frequency (typically 100 kHz)

Applications:

• Off-Line Power Supplies

• DC-DC Converters

• Battery Chargers

• LED Drivers

• Power Adapters and Monitors