LNK604DG-TL

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The LNK604DG-TL is a highly integrated and cost-effective offline switcher IC designed for power supplies ranging from 2-6W. This appealing product has won a good reputation within the power supply industry due to its smart features such as high efficiency and standby power reduction. In this article, we will discuss the application fields and working principle of the LNK604DG-TL.

The LNK604DG-TL features an adjustable peak-current limit of up to 600mA which provides excellent protection against short-circuit and overload conditions. Its slew-rate control mode allows better performance over a wide range of line and load conditions. Additionally, the device also features over-temperature protection, an internal soft-start and a unidirectional current limit. The LNK604DG-TL is designed to work with low-cost transformers and it is capable of very low noise level operation.

The LNK604DG-TL is typically used in offline AC-DC switches for power supplies ranging from 2W to 6W. It is also suitable for applications where a step-down converter is needed such as LED drivers, lighting equipment, and mobile chargers. The device also provides excellent thermal stability and low cost.

The working principle of the LNK604DG-TL is based on a cascaded topology. This topology includes a high-side PFET and a low-side FET to drive the switching duty cycle. The primary side of the transformer is driven by the PFET while the secondary side is driven by the FET. The startup behaviour is controlled by an internal regulator. When the voltage is applied, the regulator charges an internal capacitor until it reaches a voltage level which will be used to turn on the FET. This activates the flyback-oscillation, resulting in the conversion of AC input current to DC output current.

The output voltage ripple is determined by the peak-current limit of the PFET, the minimum on-time of the switching cycle and the load requirements. The device is designed to provide an adjustable constant peak-current limit. This ensures high-efficiency operation and reliable protection. The FET on-time is controlled by the internal regulator, allowing for precise and high-efficiency operation.

The LNK604DG-TL provides excellent thermal stability and low cost. Its high efficiency and good starting behaviour make it a popular choice for many applications. It is suitable for use in offline AC-DC switches and step-down converters such as LED drivers, lighting equipment, and mobile chargers.

In conclusion, the LNK604DG-TL is a highly integrated and cost-effective offline switcher IC designed for power supplies ranging from 2W to 6W. It features an adjustable peak-current limit of up to 600mA and a slew-rate control mode which provide excellent protection against short-circuit and overload conditions. Additionally, the device also features over-temperature protection, an internal soft-start, and a unidirectional current limit. It is typically used in applications where a step-down converter is needed and provides excellent thermal stability and low cost. The working principle of the LNK604DG-TL is based on a cascaded topology and provides excellent performance under a range of line and load conditions.

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