The UCC28050D by Texas Instruments is a highly integrated Power Factor Correction (PFC) controller specifically designed for use in transition-mode (also known as critical conduction mode or CrM) applications. This advanced controller is ideal for systems that require low to medium power, typically in the range of 75W to 600W, and demand high efficiency with minimal component count.

Key Features

• Transition Mode Operation: Optimizes efficiency by turning on the external switch when the inductor current reaches zero, reducing switching losses and enabling the use of smaller and less expensive inductors.
• Programmable Soft Start: Minimizes stress on the power supply during startup by gradually increasing the output voltage, thereby improving system reliability.
• Low Start-Up and Operating Current: The device has a low start-up current of 100µA (typical) and a low operating current of 2.5mA (typical), which contributes to overall system efficiency.
• Advanced Current-Shaping: Provides near-unity power factor by shaping the input current waveform to match the input voltage, ensuring compliance with global power factor regulations.
• Drive Capability: Capable of directly driving a MOSFET or IGBT, the UCC28050D simplifies external circuitry.
• Protection Features: Includes over-voltage protection, peak current limit, and open-loop detection to safeguard the controller and power supply under abnormal conditions.

Applications

The UCC28050D is versatile and can be used in a variety of applications that require power factor correction, such as:

• AC-DC Adapters for Laptops and PCs
• Televisions and Monitors
• Lighting Systems
• Standby and Auxiliary Power Supplies

Technical Specifications

The UCC28050D is offered in an 8-pin SOIC package, providing a compact solution for space-constrained applications. It operates over a wide temperature range from -40°C to +105°C and is designed to work with a wide range of input voltages, accommodating various global standards.

For engineers and designers looking for a robust and efficient PFC solution, the UCC28050D offers a compelling blend of features that enhance performance while simplifying design and reducing overall system cost.