UCC2813-5

The UCC2813-5 is a high-efficiency, current-mode PWM controller designed by Texas Instruments for offline power supplies. It operates with a wide input voltage range from 8 V to 24 V, making it suitable for various applications including AC/DC adapters, industrial power supplies, and consumer electronics. The device features an internal high-voltage startup circuit that reduces external component count and simplifies design. This controller incorporates a precision reference, error amplifier, and high-speed comparator to ensure stable regulation under varying load and line conditions. Its current-mode architecture provides excellent transient response, inherent cycle-by-cycle current limiting, and simplified feedback loop compensation. The integrated oscillator allows precise frequency control between 20 kHz and 1 MHz, enabling efficient operation across multiple topologies such as flyback, forward, and buck converters. The UCC2813-5 includes built-in protection features like overvoltage protection (OVP), thermal shutdown, and undervoltage lockout (UVLO) to enhance system reliability. These protections help prevent damage due to abnormal operating conditions, ensuring long-term stability in demanding environments. Additionally, the device supports soft-start functionality to reduce inrush current during power-up, minimizing stress on components and improving system longevity. Designed for low standby power consumption, the UCC2813-5 achieves high efficiency even at light loads, meeting modern energy standards such as ENERGY STAR and CoC Tier 2. It operates with minimal external components—typically just a few resistors, capacitors, and a transformer—making it ideal for compact and cost-sensitive designs. The controller’s robust design also supports both primary-side and secondary-side feedback methods, offering flexibility in implementation depending on isolation requirements and accuracy needs. Applications include battery chargers, LED drivers, telecom power supplies, and small appliances where efficiency, simplicity, and reliability are critical. Its compatibility with widely used switching topologies and support for isolated power conversion make it a versatile choice for engineers developing compact, high-performance power solutions. With its comprehensive set of features and proven performance in real-world systems, the UCC2813-5 stands out as a reliable solution for modern power supply designs.