The LNK500GN is a LinkSwitch-TN series offline switcher IC from Power Integrations. It is designed for low power, non-isolated offline power supplies. The device integrates a power MOSFET, oscillator, on/off control circuit, high-voltage switched current source, frequency jittering, cycle-by-cycle current limit, and thermal shutdown circuitry onto a monolithic IC.

Applications

• Appliance Power Supplies
• Metering Power Supplies
• LED Drivers
• Industrial Controls
• Standby Power Supplies

Features

• Integrated 700 V Power MOSFET
• Self-Biased Supply
• Frequency Jittering for Reduced EMI
• Cycle-by-Cycle Current Limit
• Thermal Shutdown Protection
• On/Off Control for High Efficiency at Light Loads
• Auto-Restart Protection for Short-Circuit and Open-Loop Faults
• EcoSmart™ Energy Efficient

Benefits

• Lower System Cost: Integrated features reduce the number of external components, lowering overall system cost.
• Improved Efficiency: On/Off control provides high efficiency at light loads, minimizing standby power consumption.
• Enhanced Reliability: Built-in protection features (current limit, thermal shutdown, auto-restart) protect the IC and the power supply from damage.
• Reduced EMI: Frequency jittering helps to minimize electromagnetic interference, simplifying compliance with EMI regulations.
• Compact Design: The small size of the package allows for compact power supply designs.

Additional Details

The LNK500GN is packaged in a SMD-8 package. It is designed to operate directly from a rectified high-voltage DC bus. The device's self-biased supply eliminates the need for an external bias winding, further reducing component count. The auto-restart feature automatically restarts the power supply after a fault condition is removed. The EcoSmart™ technology enables energy-efficient operation, meeting global energy efficiency standards.