LNK457DG-TL

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The LNK457DG-TL is an integrated low-side power switch for LED drivers that uses an externally accessible control node to switch at currents up to 5 A. This product is specifically designed for applications where small size and low external parts count are essential.

The external control node is a single-ended voltage-controlled input. Applying a voltage between this node and ground enables the device to conduct current through the internal MOSFET by forming a voltage divider between the internal pullup resistor and the external Control Node.

The LNK457DG-TL is optimized for use in a wide variety of LED driver applications such as general lighting, decorative lighting and backlighting. Its features make it ideal for powerful, but low-cost and compact LED drivers that require a low external parts count.

The device is capable of operating at a maximum duty cycle of 99.9%. This allows the device to operate in a quasi-constant frequency mode and results in improved efficiency, reduced size and improved EMI performance.

The internal MOSFET is thermal-overload protected, making it safe and reliable in various operating conditions. In addition, the device has been designed to handle both transient and continuous overload conditions.

Aside from being used in LED driver applications, the LNK457DG-TL can also be used in other low-side switching applications. It can be used in both negative rail and positive rail applications and its robust design makes it capable of handling both transient and continuous overload conditions.

In addition to providing a high power and robust design, the LNK457DG-TL also has a number of features that make it an ideal choice for LED driver applications. It is capable of operating at frequencies up to 100 kHz and has a minimum on/off time of 3 µs, allowing it to be used in dimmable LED drivers. The device also has dynamic current sense protection, open and short circuit protection, and cycle-by-cycle current limiting. All these features improve the reliability and robustness of the device.

In summary, the LNK457DG-TL is an integrated low-side power switch designed specifically for LED driver applications. It has an external control node to switch at currents up to 5 A and is optimized for general lighting, decorative lighting, and backlighting. The device is capable of operating at frequencies up to 100 kHz, with a minimum on/off time of 3 microseconds. It also has a number of features that improve reliability, such as cycle-by-cycle current limiting, dynamic current sense protection, and open and short circuit protection. The device is also thermal-overload protected and can handle both transient and continuous overload conditions. All these features make the LNK457DG-TL an ideal choice for LED driver applications.

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