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Texas Instruments UCC28782ARTWT Overview The Texas Instruments UCC28782ARTWT is part of the UCCx878 family and is an advanced synchronous flyback controller with active power factor correction for AC-DC power supplies. It operates at a fixed frequency and is designed for high-efficiency offline power supplies. Functions - Active Power Factor Correction (PFC): Helps to improve power conversion efficiency and meet regulatory standards. - Synchronous Rectification Control: Enables higher efficiency by minimizing power losses in the secondary rectifiers. - Constant Voltage (CV) and Constant Current (CC) Regulation: Ensures stable output voltage and current. - Soft Start and Stop: Provides smooth startup and shutdown sequences for the power supply. - Overcurrent, Overvoltage, and Overtemperature Protections: Protects the power supply and connected devices. Applications The UCC28782ARTWT is commonly used in various power supply applications, including: - LED Lighting: Driver circuits for LED lighting fixtures. - Consumer Electronics: Power adapters, chargers, and standby power supplies. - Industrial Power Supplies: Power modules and converters for industrial equipment. Alternative Components Alternative components to the UCC28782ARTWT include: 1. ON Semiconductor NCP1397B: Another active PFC controller with comprehensive protection features. 2. STMicroelectronics L6563: A versatile PFC controller suitable for a range of power supply designs. Embedded Modules Embedded modules that can complement the UCC28782ARTWT include: - Isolated Gate Drivers: Such as the Texas Instruments UCC21520, for driving the power MOSFETs in the secondary side. - Voltage Regulators: To provide additional voltage rails for auxiliary functions in the power supply. Related Q&A 1. How does the active PFC feature in the UCC28782ARTWT benefit power supply designs? The active PFC feature helps to optimize the power factor of the input current, resulting in improved efficiency, reduced harmonic distortion, and compliance with regulatory standards for power quality. 2. What are the advantages of using synchronous rectification with the UCC28782ARTWT? Synchronous rectification minimizes power losses in the secondary rectifiers, leading to higher efficiency and reduced heat generation in the power supply. 3. Can the UCC28782ARTWT be used in dimmable LED lighting applications? Yes, the UCC28782ARTWT can be integrated into dimmable LED driver circuits to regulate the output voltage and current based on the dimming level, providing flexibility and efficiency in LED lighting systems. 4. How does the soft start feature of the UCC28782ARTWT help in power supply operation? The soft start feature gradually ramps up the output voltage during startup, preventing voltage overshoots and minimizing inrush current, which helps in extending the lifespan of components and enhancing overall system reliability. 5. What is the typical efficiency range achievable with the UCC28782ARTWT in AC-DC power supply designs? With proper design and implementation, the UCC28782ARTWT can achieve high-efficiency levels above 90% in AC-DC power supplies, making it ideal for energy-efficient applications where power conversion efficiency is crucial.