The IC UC3843 ST is a high-performance current mode PWM controller designed for off-line and DC-DC fixed-frequency control applications. It offers precise frequency control, low start-up current, and integrated protection features, making it ideal for efficient and reliable power supply designs.

Key Features:

• Trimmed Oscillator: Ensures precise frequency control for stable operation.
• Low Start-Up Current: Features a start-up current of less than 0.5mA, enhancing energy efficiency.
• UVLO: Provides under-voltage lockout (UVLO) with hysteresis to prevent erratic operation.
• Current Mode Operation: Supports operation up to 500kHz, suitable for high-frequency applications.
• Integrated Protection: Includes automatic feed-forward compensation, pulse-by-pulse limiting, and latching PWM.

Package Includes:

• 1 x IC UC3843 ST High-Performance Current Mode PWM Controller

Specifications:

• Input Voltage Range: 7.6V to 30V
• Operating Frequency: Up to 500kHz
• UVLO Thresholds: 8.5V (on), 7.9V (off)
• Output Current: 1A peak
• Package Type: 8-DIP (0.300″, 7.62mm)
• Operating Temperature: 0C to +70C

Applications:

• Off-line converters
• DC-DC converters
• Switch-mode power supplies (SMPS)
• Industrial power control systems
• Battery chargers

Datasheet:

Click here to view the datasheet