LNK363DG-TL

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Linear Technology\'s LNK363DG-TL is a high-performance, isolated flyback power supply controller IC optimised for low-voltage universal input applications. With its on-board MOSFET, it provides a compact, low-cost power solution that enables excellent system level performance. LNK363DG-TL is widely used in a variety of markets requiring power solutions at an economical price.

LNK363DG-TL belongs to the PMIC (Power Management Integrated Circuit) family of AC-DC converters, offline switchers and other power solutions for a wide range of applications. It offers levels of integration, protection and performance that are not available from other power solutions.

The LNK363DG-TL is designed to allow maximum flexibility from the user. It provides a wide range of adjustable parameters to suit specific application requirements. The LNK363DG-TL offers a variable switching frequency from 40kHz to 600kHz, variable output current limit, variable over-current protection threshold, and variable ramp rate for the switch-on transition. Safety features include input over-voltage, output over-voltage, over-temperature protection, short-circuit protection, and output transient protection.

The LNK363DG-TL also features an isolated direct instantaneous current sense input that allows the user to easily monitor switch current and output load current. This feature simplifies design compliance to safety and EMC regulations. The closed loop control architecture ensures accuracy and stability over the entire operating range.

The LNK363DG-TL provides a variety of application options, making it an ideal choice for cost-sensitive, high-performance isolated power solutions. This power solution is suitable for a variety of applications including battery charging, ITE and industrial/commercial/consumer applications.

The LNK363DG-TL operates on the isolated flyback topology utilising a MOSFET switch for the power conversion. When the high-side MOSFET is switched on, the current will flow through the MOSFET and the high-frequency transformer, inducing a voltage across the transformer secondary winding. The voltage then feeds the output capacitor and filter to provide an output voltage. When the MOSFET switch is turned off, energy stored in the high-frequency transformer flies back to the MOSFET, producing a negative current. The input side also contains a MOSFET switch and a diode, which serve to isolate the input form the output.

The operation of the LNK363DG-TL can be summarised into four simple steps. First, a regulated voltage is created across the transformer primary winding. This regulated voltage is then sensed by the control circuitry and used to regulate the primary and secondary openings of the MOSFET switch. When the MOSFET switch is opened and closed in this way, it creates a boost-buck power transfer, which results in a regulated DC output voltage. Finally, the voltage is smoothed and filtered, producing a clean, regulated output.

The LNK363DG-TL has been designed to meet the stringent requirements for power supply designers. Its high efficiency, small size and low cost make it the ideal choice for a wide range of high-performance, low-cost power applications. It offers a cost-effective and reliable solution for a variety of power related applications.

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