L6699D

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Power-Management Integrated Circuit (PMIC) solutions are immensely valuable to the modern machine system, as they serve as a one-stop-shop for a variety of system-level needs, such as energy-management, device integration, and more. One of the increasingly popular solutions within this extensive list is AC/DC converters and offline switchers, with the L6699D being one of the most commonly found components in the market today. This piece defines the scope of applications of the L6699D, helps identify the nuances of its working principles and introduces some remarking performance characteristics.

Application Field of L6699D

The L6699D is an integrated power-management IC designed for offline switching applications, and can be powered from a non-isolated AC line. This IC provides an optimal solution for designs featuring an input power range of up to 265V and ultra-low standby power consumption. The L6699D is an excellent choice for numerous applications, such as, e.g., home appliances and other consumer products, such as PCs, gaming consoles, personal electronics, and numerous industrial and telecom applications.

Working Principle

The L6699D features cutting-edge control features, visible in its sensitive output power management, protection stages, and internal MOSFET control without the need of an external resistor. The internal primary-side regulator assists in controlling the power and improving the system efficiency, while the adaptive on-time control feature helps reduce the total cost by eliminating the need of an external clock source.The L6699D employs a quasi-resonant mode (QRM) of operation and a synchronous flyback converter design. This allows it to quickly shut down the output when the load is shorted, which helps protect the complete system from damage. The primary switching FET is controlled through a programmable constant current current-mode (CCM) pulse width modulator (PWM). This helps prevent over-loading the input voltage and protects components from damage, as the frequency does not depend on the load. The IC also employs an Enhanced Pre-Biased Start-up Magna-Start (EPBS) circuit, which allows the device to start up from the lowest input voltage, regardless of the load.

Performance Characteristics

The L6699D provides a competent set of features,ranging from adjustable output voltage control and soft-start features to comprehensive protection functions and higher system efficiency.The device also offers an adjustable peak current limit, an adjustable off-time current limit setting, an adjustable low-frequency overflow protection and a low THD (total harmonic distortion).It is also noteworthy that the L6699D utilizes the McSwap power-saving mode, an advanced system-level energy-saving feature, which guarantees average line efficiency above 95%. The IC also consists of integrated thermal shutdown (TSD) protection, making it optimal for high-power applications and improved system reliability, which can scale up to 8W at 48V/167mA.Overall, this robust, modern solution proves to be an ideal choice for numerous projects, providing superb performance and system integration, while also minimizing design time and cost.

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