LNK364DNAU

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The LNK364DNAU is a linear integrated circuits (ICs) intended for use in offline switching power supplies. This type of IC is widely used in off-line applications such as adaptors, chargers and motor drives with tight output voltage regulation. It offers several features for optimal performance, including:

• Low-cost toroidal magnetics with built-in secondary rectifier bridges;
• Improved control regulation – no need for opto isolation;
• Flexible application – suited for isolated or non-isolated systems; and
• Integrated logic for better performance and greater efficiency.

This device is designed with an efficient, high-voltage process that allows it to be integrated into a wide range of applications. It is also equipped with a wide operating range, so it is capable of meeting the voltage and power requirements of various low-noise, low-ripple energy conversion systems. In addition, this device includes a high-efficiency power stage, providing up to 70% efficiency. It also offers limited EMF and harmonic distortion, making it an attractive option for low-emission applications.

The working principle of the LNK364DNAU is based on a distinct, hierarchical control loop. The first stage is the primary-side MOSFET that forms the basis of the switching module (active power section). This MOSFET supplies the main power to the output unit and also regulates the output voltage via a feedback network (which includes a divider, error amplifier, and comparator). The comparator compares the output voltage with a reference voltage, which triggers the MOSFET on and off. This action allows the output voltage to be regulated, while maintaining the specified power.

The next stage of the control loop is the secondary gate driver, which receives signals from the primary driver and activates the power MOSFET on the secondary side. This secondary MOSFET acts as a “driver” for the output stage, ensuring that power is distributed to the output devices in an efficient way, and without peaks or instabilities. It also allows for a sense resistor to be connected, which increases the dynamic regulation range of the system.

The last stage of the LNK364DNAU control loop is the control circuitry. This circuitry incorporates the on/off controllers, temperature trimming, over-current protection, and biasing; the output section; and the oscillator. This allows precise regulation and control of the system, allowing for different output parameters to be adjusted, such as output voltage, current limit, switching frequency, and inrush current.

The LNK364DNAU is a reliable and efficient PMIC-AC DC converter that is suitable for a wide range of offline switching applications. Its hierarchical control loop provides good performance and high efficiency, while its integrated control circuitry allows precise regulation. Overall, this device offers a cost-effective, high-performance solution for offline switching-related applications.

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