VSBU-120-12 - CUI Inc.

VSBU-120-12 Frequently Asked Questions (FAQs)

• What is the recommended PCB layout and thermal management for optimal performance?
  CUI recommends a PCB layout with a solid ground plane and thermal vias to dissipate heat. A minimum of 2 oz copper thickness is recommended. Additionally, a thermal interface material (TIM) with a thermal conductivity of 1 W/m-K or higher is suggested between the module and the heat sink.
• How do I ensure reliable start-up and shutdown of the VSBU-120-12?
  To ensure reliable start-up and shutdown, CUI recommends a soft-start circuit to limit inrush current and a shutdown circuit to prevent back-EMF damage. Additionally, a minimum input capacitance of 10 uF is recommended to ensure stable operation.
• What is the maximum allowable output capacitance for the VSBU-120-12?
  The maximum allowable output capacitance for the VSBU-120-12 is 100 uF. Exceeding this value may cause instability or oscillation in the output voltage.
• Can I use the VSBU-120-12 in a high-vibration environment?
  Yes, the VSBU-120-12 is designed to withstand high-vibration environments. However, CUI recommends following the recommended PCB layout and mounting guidelines to ensure reliable operation. Additionally, a vibration test should be performed to ensure the module meets the specific application requirements.
• What is the derating curve for the VSBU-120-12 at high temperatures?
  CUI provides a derating curve in the datasheet, which indicates the maximum output power vs. temperature. The derating curve is based on a 50% derating of the maximum output power at 85°C. For example, at 100°C, the maximum output power is derated to 30% of the maximum output power at 25°C.