The LN8K15 is a high-performance AC/DC switching buck converter integrated circuit (IC) developed by Lii Semiconductor. It's designed to efficiently convert high-voltage AC input into a stable DC output, making it suitable for applications like small appliance power supplies, air conditioner controllers, and other non-isolated power systems.

? Key Features

• Integrated 750V High-Voltage BJT: Allows direct connection to high-voltage AC inputs (85–380V AC) without the need for external high-voltage components.

• Output Voltage: Typically 12V DC.

• Output Current: Up to 400mA.

• Operating Frequency: Up to 50kHz.

• Low Standby Power Consumption: Below 0.10W, meeting Energy Star Level 5 efficiency standards.

• Built-in Protection Features: Includes short-circuit, overload, and over-temperature protection.

• Control Technology: Utilizes ZeroFlux™ and smartEnergy™ technologies for improved efficiency and reduced electromagnetic interference.

• Package: Available in both SOP6 and DIP7 packages.

? Package and Pinout

• Package Type: DIP7 (Dual In-line Package, 7 pins).

• Pin Configuration:

  1. VST (Start Trigger)

  2. VCC (Power Supply)

  3. GND (Ground)

  4. BP (Bypass Capacitor)

  5. CS (Current Sense)

  6. NC (No Connection)

  7. HV (High-Voltage Input)

  8. HV (High-Voltage Input)

? Typical Applications

• Small Appliance Power Supplies: Powering devices like electric fans, humidifiers, and other household appliances.

• Air Conditioner Controllers: Supplying power to control circuits in air conditioning units.

• Non-Isolated Power Systems: Providing DC power from high-voltage AC sources in applications where electrical isolation is not required.