The LNK306 is a LinkSwitch-TN series AC-DC converter IC from Power Integrations. It is designed for offline switching applications, offering a simple and efficient solution for low power non-isolated power supplies. This IC integrates a 700 V power MOSFET, oscillator, simple on/off control scheme, a high-voltage switched current source, frequency jittering, cycle-by-cycle current limit, and thermal shutdown circuitry onto a monolithic IC.

Applications:

• Appliances: Specifically, it is often used in appliance power supplies.
• Metering: Commonly found in the power supplies of electricity meters.
• LED Drivers: Suitable for driving low-power LEDs.
• Industrial Controls: Used in auxiliary power supplies for industrial control systems.

Features:

• Integrated 700 V Power MOSFET: Simplifies design and reduces component count.
• Self-Biased Supply: Eliminates the need for an external bias winding.
• Frequency Jittering: Reduces EMI emissions, simplifying compliance with regulatory standards.
• On/Off Control: Provides simple and efficient regulation.
• Auto-Restart Protection: Protects against short-circuit and open-loop fault conditions.
• Hysteresis Thermal Shutdown: Protects the device from overheating.
• Meets High Voltage Creepage Requirements: Enhances safety in high-voltage applications.

Benefits:

• Cost-Effective: Reduces overall system cost due to integrated components and simplified design.
• Energy Efficient: Improves energy efficiency with low standby power consumption.
• Reliable: Robust protection features ensure reliable operation in various conditions.
• Compact Design: Smaller footprint compared to discrete solutions.
• Simplified Design: Easy to design with, reducing time to market.

Additional Details:

The LNK306 typically operates in a discontinuous conduction mode (DCM). It has built-in features to minimize audible noise and optimize efficiency. The device's internal current limit and thermal shutdown functions provide comprehensive protection against overload and over-temperature conditions. It's available in a variety of packages, including DIP and SMD options, providing flexibility in board layout and manufacturing. The specific LNK306 variant (e.g., LNK306DN, LNK306GN) determines the available output power and package type. Refer to the Power Integrations datasheet for detailed electrical characteristics, application circuit examples, and layout recommendations.