**LT3796EFE#TRPBF: A High-Performance Isolated Flyback Controller with Power Factor Correction**
In the realm of power electronics, achieving high efficiency, robust isolation, and a high power factor is a critical challenge for AC/DC power supplies across industrial, automotive, and consumer applications. The **LT3796EFE#TRPBF** from Analog Devices stands out as a monolithic, active power factor correction (PFC) controller specifically engineered to master this challenge in isolated flyback converter topologies.
This controller is architected to operate as a **critical conduction mode (CrM) flyback controller**, a topology chosen for its inherent ability to provide electrical isolation and efficiently manage power levels up to 100W. Its primary function is to regulate the output voltage while actively shaping the input current waveform to be in phase with the input AC voltage. This process, known as **Power Factor Correction (PFC)**, is vital for maximizing the real power drawn from the mains and minimizing harmonic distortion, which is often a requirement for compliance with international standards like EN61000-3-2.
A key strength of the LT3796EFE#TRPBF lies in its innovative control methodology. It utilizes a unique single-stage approach that **integrates both PFC and output voltage regulation into a single switch**. This elegant design eliminates the need for a separate, dedicated PFC front-end stage, thereby reducing component count, simplifying the overall circuit design, and enhancing system reliability. The controller drives an external MOSFET switch and precisely controls its on-time to achieve a near-unity power factor.
The device is packed with features that underscore its high-performance designation. It offers **advanced protection and fault management** capabilities, including open-loop protection, output overvoltage protection, and thermal shutdown. Its wide input voltage range makes it suitable for universal mains applications (85VAC to 265VAC). Furthermore, it provides a constant output voltage regulation that is highly accurate, independent of line and load variations.
Housed in a compact 16-Lead TSSOP exposed-pad package, the **LT3796EFE#TRPBF provides excellent thermal performance**, which is crucial for maintaining stability and longevity in space-constrained and high-power-density designs. Its ability to deliver high power factor (>0.97), low total harmonic distortion (THD), and tight output regulation makes it an superior solution for demanding applications such as LED drivers, industrial system power supplies, and battery chargers.
**ICGOODFIND**: The LT3796EFE#TRPBF is a sophisticated and highly integrated controller that simplifies the design of high-performance, isolated power supplies. Its single-stage PFC flyback architecture offers a compelling blend of efficiency, component reduction, and robust feature set, making it an excellent choice for designers seeking to meet stringent regulatory and performance demands.
**Keywords**: Power Factor Correction (PFC), Isolated Flyback Converter, Critical Conduction Mode (CrM), Single-Stage Conversion, High-Performance Controller.
