PSK-20D-15 - CUI Inc.

PSK-20D-15 Frequently Asked Questions (FAQs)

• What is the recommended PCB layout and thermal management for optimal performance?
  A recommended PCB layout would include a large copper area for heat dissipation, and thermal vias to connect to a heat sink or thermal pad. Ensure good airflow and consider using a thermal interface material to improve heat transfer.
• How do I ensure reliable start-up and shutdown of the power supply?
  Implement a soft-start circuit to limit inrush current during start-up, and consider adding a delay circuit to ensure the power supply is fully on before applying load. For shutdown, use a controlled shutdown sequence to prevent voltage spikes and ensure a clean shutdown.
• What are the EMI and RFI considerations for this power supply?
  The PSK-20D-15 is designed to meet CISPR 22 Class B emissions standards. Ensure proper PCB layout, use of EMI filters, and shielding to minimize radiated emissions. Consider adding a metal enclosure and EMI gaskets to further reduce emissions.
• How do I protect the power supply from input voltage transients and surges?
  Use a transient voltage suppressor (TVS) or a metal oxide varistor (MOV) to protect the input stage from voltage transients and surges. Ensure the TVS or MOV is rated for the maximum expected input voltage and surge energy.
• What are the derating curves for temperature and altitude?
  The derating curves for temperature and altitude can be obtained from the manufacturer or through application notes. Typically, the power supply's output power is derated by 1-2% per 1000 ft of altitude and 1-2% per 10°C above 25°C ambient temperature.