UC3843B Integrated Circuit Original ST

The UC3843B is a high-performance, fixed-frequency, current-mode PWM (Pulse Width Modulation) controller. It is commonly used in switch-mode power supplies (SMPS), DC-DC converters, and adapter circuits.

Key Features

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• Operating Voltage: 8V – 35V
• Output Current: 1 A
• Switching Frequency: Up to 500 kHz
• UVLO (Undervoltage Lockout) Threshold: 8.4V (on) / 7.6V (off)
• Output Type: Totem-pole driver (suitable for driving MOSFETs)
• Reference Voltage: 5V (±2% accuracy)
• Operating Temperature Range: 0°C to 70°C
• Package Types: DIP-8 and SOP-8

Applications

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• Off-line and DC-DC converters
• High-efficiency switch-mode power supplies
• LED driver circuits
• Power modules for industrial and consumer electronics