LNK4114D-TL

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LNK4114D-TL is an adjustable off-line switcher with a wide range of applications, designed by Power Integrations to provide a cost-effective solution with low losses. It is designed to provide an integrated high-performance solution, minimizing the components required to build both efficient offline power supplies and LED drivers, and needs no development or design activity.

The LNK4114D-TL features integrated switching, synchronous rectification, and regulation in a single, 60V-rated package. This allows designers to build smaller, more efficient, and more affordable off-line power supplies. The integrated topology is also suitable for constant power LED drivers, providing a high efficiency solution for lighting applications. Additionally, the LNK4114D-TL includes burst-mode operation for peak-free suppression, the ability to provide either constant voltage or constant current, and low standby-power requirements.

The LNK4114D-TL has fixed frequency operation at 150kHz which improves EMI performance and simplifies the design effort as no external frequency compensation is required. With a current-mode control scheme, the device is designed to deliver excellent load and line regulation, with low output ripple. Peak current mode control also provides improved system stability and simplified loop compensation. The LNK4114D-TL takes both primary and secondary side protection into account, enclosing thermal and overload protection, as well as power-good signal generation.

The working principle of the LNK4114D-TL is based on a full bridge synchronous rectification scheme and peak current mode control, switching at a fixed frequency of 150kHz. The circuit consists of a dual-output full-bridge rectifier, a synchronous rectification stage, and a control stage. The full-bridge rectifier is formed by two power MOS transistors with two diodes connected in antiparallel. The rectified secondary side output is connected to the synchronous rectification stage, consisting of two power MOSFETs operating in pairs as a low-side switch and a high-side switch. The control stage senses the output voltage and current, and drives the full-bridge rectifier and the synchronous rectification stage according to the sensed values. The main features of the circuit are line regulation, load regulation, and power management.

In conclusion, the LNK4114D-TL from Power Integrations is an all-in-one off-line switcher specially designed for cost-effective, efficient and simplified voltage or current source applications. With an integrated full bridge and synchronous rectification, enhanced power-good signal, adjustable over-temperature and overload protection, the device provides a compact, compact and high performance solution for a variety of power supply applications, such as lighting systems, linear off-line power supplies, and LED drivers.

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