What is LNK364PN Chip?

 The LNK364PN is a highly integrated off-line switcher IC from Power Integrations used for designing efficient, low-cost power supplies. It is part of the LinkSwitch-TN family, which simplifies the design of low-power offline switch-mode power supplies (SMPS) for a variety of applications, such as chargers, adapters, and standby power supplies. This IC is especially valued for its ability to deliver constant voltage or constant current with high efficiency, while minimizing the number of external components required.   

Key Features:

  1. Integrated MOSFET: The LNK364PN integrates a high-voltage power MOSFET, oscillator, feedback control, and protection circuits in a single package. This integration reduces the complexity of the power supply design and cuts down on the need for external components like feedback resistors or zener diodes.

  2. Energy Efficiency: The IC features a no-load power consumption of less than 100 mW, which makes it suitable for designs that need to comply with stringent energy efficiency standards like Energy Star or EU Code of Conduct for external power supplies. It operates with efficiencies greater than 70% even at light loads.

  3. Primary-Side Regulation: The LNK364PN uses primary-side control, which eliminates the need for an optocoupler, improving reliability and further reducing component count and cost. It directly senses the output voltage through the transformer winding, making it ideal for isolated power supply designs.

  4. Protection Features: This IC comes with built-in protection mechanisms such as over-temperature protection (OTP), over-voltage protection (OVP), and over-current protection (OCP). These safeguards ensure that the IC can withstand harsh operating conditions and protect the power supply from damage.

  5. Small Package Size: The LNK364PN is housed in an 8-pin DIP package, which allows for a compact design, ideal for space-constrained applications like phone chargers, appliance controllers, and auxiliary power supplies for larger systems.

Applications:

  • Standalone power supplies for appliances like washing machines and refrigerators
  • Auxiliary power supplies in larger systems like industrial controls
  • Chargers for mobile phones, battery packs, and other portable devices
  • Standby power supplies in televisions, set-top boxes, and networking equipment

Technical Specifications:

  • Input Voltage Range: 85V to 265V AC
  • Output Power: Up to 4W in 85-265V AC range, 3.2W at 230V AC
  • Switching Frequency: 66 kHz
  • Efficiency: Over 70% at light load
  • No-load Power Consumption: Less than 100 mW 

The LNK364PN stands out in applications where energy efficiency, low component count, and reliability are important, making it a go-to IC for cost-sensitive yet high-performance power supply designs. 

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