Overview of Texas Instruments UCC2813DTR-2

The UCC2813DTR-2 is a low-power, BiCMOS current-mode PWM controller from Texas Instruments, designed for a wide range of power supply applications. This versatile integrated circuit is part of the UCC2813-x family, where 'x' denotes the series that offers a variety of turn-on and turn-off thresholds suitable for different applications. The UCC2813DTR-2, in particular, is optimized for off-line and DC-to-DC converter applications requiring a low startup current and operation under low-duty cycles.

Key Features

• Low Startup and Operating Current: The device features a startup current of typically 0.5 µA and an operating current of 1 mA, making it an energy-efficient choice for battery-powered devices.
• High-Frequency Operation: With a maximum duty cycle of 50%, the UCC2813DTR-2 is capable of operating at frequencies up to 1 MHz, allowing for smaller components and reduced space on the PCB.
• Trimmed Oscillator Discharge Current: The oscillator discharge current is accurately trimmed to ensure precise duty cycle clamping, which is critical for reliable and stable power supply designs.
• Current Sense Discharge Transistor: A discharge transistor on the current sense input allows for rapid discharge of the current sensing capacitor, improving responsiveness and protection.
• Automatic Feed-Forward Compensation: The device includes feed-forward compensation that helps maintain stable operation despite variations in input voltage.
• Soft-Start: The UCC2813DTR-2 incorporates a soft-start feature to minimize inrush current during startup, enhancing the longevity of the power supply components.

Applications

• AC/DC power supplies
• Isolated and non-isolated flyback converters
• Forward converters
• DC/DC converters
• Offline power supplies

Package and Availability

The UCC2813DTR-2 is available in the industry-standard SOIC-8 (D) package, ensuring compatibility with existing designs and ease of integration into new projects. Its tape and reel packaging facilitates automated assembly processes, making it suitable for high-volume production. Texas Instruments provides comprehensive technical support, including datasheets, reference designs, and simulation tools to assist designers in implementing the UCC2813DTR-2 in their power supply solutions.