Professional IC Distribution & Technical Solutions

The UC2840 is a high-performance current-mode PWM controller manufactured by STMicroelectronics. Below are its specifications, descriptions, and features based on the Manufactor Datasheet:

Specifications:

• Input Voltage Range: 8V to 30V
• Operating Frequency: Up to 500 kHz
• Output Current (Source/Sink): 1A (Peak)
• Duty Cycle Range: 0% to 100%
• Reference Voltage: 5V (±1%)
• Quiescent Current: 11mA (Typical)
• Operating Temperature Range: -40°C to +85°C
• Package Options: SO-8, DIP-8

Descriptions:

The UC2840 is a fixed-frequency pulse-width modulation (PWM) controller designed for offline and DC-DC converter applications. It operates in current-mode control, providing improved loop response and simplified feedback compensation. The device includes features such as under-voltage lockout (UVLO), cycle-by-cycle current limiting, and a trimmed oscillator for precise frequency control.

Features:

• Current-Mode Control: Enhances transient response and simplifies loop compensation.
• Under-Voltage Lockout (UVLO): Ensures proper startup and shutdown.
• Trimmed Oscillator: Precise frequency control with external timing components.
• Soft-Start Capability: Reduces inrush current during startup.
• High-Current Totem Pole Output: Directly drives power MOSFETs.
• Cycle-by-Cycle Current Limiting: Protects against overloads.
• Low Startup Current: Enables efficient operation in low-power applications.

The UC2840 is commonly used in power supply designs, including flyback, forward, and buck-boost converters.