Professional IC Distribution & Technical Solutions

The UC2843AN is a high-performance current-mode PWM controller manufactured by Texas Instruments (formerly Unitrode). Below are its specifications, descriptions, and features:

Specifications:

• Topology: Current-mode PWM controller
• Operating Frequency: Up to 500 kHz
• Input Voltage (V_CC): 8.4V to 30V (start-up voltage: 16V typical)
• Output Drive Current: ±1A (peak)
• Duty Cycle Range: 0% to 100%
• Reference Voltage: 5V (±1% tolerance)
• Operating Temperature Range: -40°C to +85°C
• Package: 8-Pin PDIP (Plastic Dual In-Line Package)

Descriptions:

• The UC2843AN is designed for offline and DC-DC converter applications.
• It provides precise duty cycle control with current-mode operation for improved loop response and simplified compensation.
• Features include an undervoltage lockout (UVLO) with hysteresis, ensuring reliable start-up and shutdown.
• Includes a built-in trimmed oscillator, error amplifier, and current-sensing comparator.

Features:

• Current-Mode Operation: Enhances transient response and simplifies loop compensation.
• Automatic Feed-Forward Compensation: Improves line regulation.
• Undervoltage Lockout (UVLO): Ensures proper operation within specified voltage limits.
• High-Current Totem Pole Output: Directly drives power MOSFETs.
• Pulse-by-Pulse Current Limiting: Provides cycle-by-cycle protection.
• Soft-Start Capability: Reduces stress during start-up.
• Low Startup and Operating Current: Efficient power management.

The UC2843AN is commonly used in power supply designs, including flyback, forward, and boost converters.

(Note: Manufacturer is Texas Instruments, not "N/A.")