UC3843 Current-Mode PWM Controller IC – DIP-8

Description

The UC3843 is a high-performance, fixed-frequency, current-mode Pulse Width Modulation (PWM) controller. It is designed specifically for off-line and DC-to-DC converter applications, offering a robust solution that minimizes the need for external components while maximizing system efficiency.

The device integrates an internally trimmed oscillator, a precise reference voltage, and a high-current totem-pole output stage capable of driving power MOSFETs directly. Its low start-up current and integrated undervoltage lockout (UVLO) make it a standard choice for power supply designs where space, efficiency, and thermal management are critical.

Note: Product images are for reference only. The actual product may vary in appearance depending on manufacturer marking. Please refer to the official datasheet for detailed pin configurations and application schematics.

Features

• Control Mode: Optimized for current-mode control to improve line and load regulation.
• Start-up: Low start-up current (< 0.5 mA typical) for improved start-up efficiency.
• Output Drive: High-current totem-pole output stage for direct MOSFET driving.
• Protection: Integrated undervoltage lockout (UVLO) with precision hysteresis.
• Frequency: High-frequency operation with internally trimmed oscillator.
• Package: Industry-standard 8-pin dual-in-line (DIP-8) package.

Benefits

• Simplifies power supply design by integrating key control and protection functions.
• Provides excellent pulse-by-pulse current limiting for system protection.
• Compact footprint allows for efficient PCB layout in power modules.
• High reliability in industrial and consumer electronics power stages.

Applications

• Switch-Mode Power Supplies (SMPS)
• DC-DC Converter Modules
• Battery Charging Circuits
• Industrial Power Conversion Systems

Package Includes

• 1 x UC3843 Current-Mode PWM Controller IC (DIP-8)

Specifications