Industrial Electronics

LinkSwitch-XT2SR maximizes light-load efficiency for small power supplies

20 May 2024

Starting in May 2025, most appliances sold in Europe will be required to consume less than 300 mW in standby, representing a significant shift from the existing 500 mW limit. LinkSwitch-XT2SR non-isolated flyback switcher ICs from Power Integrations provide the perfect solution to comply with the new standards. The groundbreaking devices feature a synchronous rectifier driver, achieving higher than 90% efficiency even with a 300 mW input.

To aid in meeting these stringent standards, a new application note from Power Integrations (AN-109) serves as a comprehensive design guide for small open-frame power supplies. This guide exemplifies use ofSource: Power IntegrationsSource: Power Integrations the LinkSwitch-XT2SR non-isolated flyback switcher ICs for achieving a no-load consumption below 5 mW.

LinkSwitch-XT2SR ICs provide up to 250 mW to the load within the 300 mW allowance, enabling more system functionality to operate in standby mode for small appliances, internet of things-enabled home and building automation applications such as smart locks, sensor-based environmental controls and various industrial applications. In addition to choosing the suitable LinkeSwitch-XT2SR device for an application, the design guide also covers:

  • Transformer construction
  • Selection of primary clamp resistors, diodes and capacitors
  • Multiple output parameters
  • Choosing the right feedback scheme and components
  • Board layout considerations

LinkSwitch-XT2SR ICs reduce component count by integrating a synchronous rectifier driver and an auxiliary, low-current, μVcc output for directly powering an MCU. The product family offers a 725 V internal power metal-oxide-semiconductor field-effect transistor (MOSFET) switch for universal input voltage and a 900 V-rated option for an increased safety margin. For additional information:

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