UC3843 Current-Mode PWM Controller IC – SMD-8

Description

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

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

Note: Product images are for reference only. The actual product may vary in appearance depending on manufacturer marking.

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: Compact 8-pin surface mount (SMD-8 / SOIC-8) package.

Benefits

• Simplifies power supply design by integrating key control functions.
• Provides excellent pulse-by-pulse current limiting for robust protection.
• Small footprint allows for compact PCB layout in high-density power modules.
• High reliability in both 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 (SMD-8)

Specifications