Professional IC Distribution & Technical Solutions

The UC3842AN is a high-performance current-mode PWM controller manufactured by Texas Instruments (TEXAS). Below are its key specifications, descriptions, and features:

Specifications:

• Input Voltage (VCC): 16V (typical)
• Output Current (Peak): ±1A
• Operating Frequency: Up to 500kHz
• Duty Cycle Range: 0% to 100%
• Reference Voltage (VREF): 5V ±1%
• Error Amp Bandwidth: 1MHz
• Start-Up Current: <1mA
• UVLO (Undervoltage Lockout): On: 16V (typ), Off: 10V (typ)
• Package: 8-Pin DIP (Dual In-line Package)

Descriptions:

• The UC3842AN is a fixed-frequency pulse-width modulation (PWM) controller optimized for DC-DC converter applications.
• It operates in current-mode control, providing improved loop response and simplified compensation.
• Includes a trimmed oscillator, precision reference, high-gain error amplifier, current sensing comparator, and a totem-pole output driver.

Features:

• Current-Mode Operation: Enhances line and load regulation.
• Automatic Feed-Forward Compensation: Simplifies feedback loop design.
• Pulse-by-Pulse Current Limiting: Protects against overcurrent conditions.
• Undervoltage Lockout (UVLO): Ensures proper start-up and shutdown.
• Trimmed Oscillator: Precise frequency control.
• High-Current Totem-Pole Output: Directly drives power MOSFETs.
• Low Start-Up and Operating Current: Improves efficiency.

The UC3842AN is widely used in offline and DC-DC power supplies, battery chargers, and SMPS (Switched-Mode Power Supply) applications.