The UC3843 is a current-mode PWM (Pulse Width Modulation) controller IC from On Semiconductor, designed for efficient power management in switching power supplies. It provides precise control over the power conversion process, making it suitable for use in DC-DC converters, AC-DC power supplies, and other applications requiring efficient power regulation. The IC is available in a SOP-8 SMD package, ideal for compact and high-density designs.

Features

• Current-Mode Control: Provides enhanced performance and ease of compensation over voltage-mode control, offering better line regulation and cycle-by-cycle current limiting.
• High-Frequency Operation: Capable of operating at high frequencies, allowing for smaller component sizes and increased efficiency.
• Low Start-Up Current: Designed with low start-up current to minimize power consumption during initial power-up.
• Under-Voltage Lockout (UVLO): Ensures the IC remains inactive until the input voltage reaches a specific threshold, protecting the power supply from low voltage conditions.
• SOP-8 SMD Package: Compact surface-mount package for easy integration into modern PCB designs.

Specifications

• Supply Voltage: 8.4V to 30V
• Oscillator Frequency: 52 kHz typical
• Maximum Duty Cycle: 100%
• Start-Up Current: 0.5 mA typical
• Operating Temperature: -40°C to +85°C
• Package Type: SOP-8 (Small Outline Package)
• Pin Count: 8

Note: Product images are for illustrative purposes only and may differ from the actual product.