The LNK604DG is an integrated offline switcher IC belonging to the LinkSwitch-TN2 family manufactured by Power Integrations. It is designed to provide a highly efficient and compact power conversion solution for low power applications, replacing linear transformers and discrete solutions. This IC incorporates a power MOSFET, oscillator, on/off control, a high-voltage switched current source, current limit, and thermal shutdown circuitry onto a monolithic IC.

Applications:

• Home Appliances: Power supply for white goods like refrigerators, washing machines and dishwashers.
• Metering: Powering smart meters and other metering devices.
• Standby Power Supplies: Efficient power for standby circuits in various electronic devices.
• Industrial Controls: Low-power supply for sensors and control systems.
• LED Lighting: Power supply for LED drivers and lighting applications.

Features:

• Integrated 725 V Power MOSFET: Simplifies design and reduces component count.
• Self-Biased Supply: Eliminates the need for an external bias supply.
• Frequency Jittering: Reduces EMI (Electromagnetic Interference) emissions.
• Hysteric Thermal Shutdown: Protects the IC from over-temperature conditions.
• EcoSmart™ Energy Efficiency: Meets stringent global energy efficiency standards.
• Auto-Restart Protection: Provides protection against fault conditions.

Benefits:

• Reduced System Cost: Integration of multiple components lowers the overall BOM (Bill of Materials) cost.
• Improved Energy Efficiency: High efficiency performance reduces energy consumption and heat dissipation.
• Simplified Design: Fewer external components streamline the design process.
• Enhanced Reliability: Protection features ensure robust operation and long-term reliability.
• Smaller Footprint: Compact design allows for use in space-constrained applications.

Additional Details:

The LNK604DG operates in an on/off control mode, which provides excellent efficiency over a wide load range. It is designed to meet global energy efficiency standards such as Energy Star and ErP. The integrated 725 V MOSFET enables it to operate directly from rectified high voltage DC, simplifying the power supply design and reducing the size and cost of the input filter capacitor. The self-biased supply eliminates the need for an external bias winding on the transformer, further reducing component count. The frequency jittering feature spreads the EMI emissions over a wider frequency range, making it easier to meet EMC (Electromagnetic Compatibility) standards.

The IC's protection features include over-temperature protection, over-voltage protection, and short-circuit protection. These features ensure that the power supply is protected against various fault conditions, enhancing its reliability and preventing damage to the IC and the load. The EcoSmart™ technology minimizes the no-load power consumption, making it ideal for applications that require low standby power. The LNK604DG is available in a variety of package options, including DIP and SMD, allowing for flexible mounting options.