VHB75W-Q48-S12 - CUI Inc.

VHB75W-Q48-S12 Frequently Asked Questions (FAQs)

• What is the recommended PCB layout and thermal management for optimal performance?
  CUI recommends a PCB layout with a large copper area for heat dissipation, and thermal vias to connect to a heat sink or a metal core PCB. A minimum of 2oz copper thickness is recommended. Additionally, a thermal interface material (TIM) can be used to improve heat transfer between the module and the heat sink.
• How do I ensure reliable start-up and shutdown of the module?
  To ensure reliable start-up and shutdown, CUI recommends a soft-start circuit to limit inrush current, and a shutdown circuit to prevent voltage spikes. The module's enable pin should be driven by a logic signal with a rise and fall time of 1ms or slower.
• What is the maximum allowable capacitance on the output?
  The maximum allowable capacitance on the output is 220uF. Exceeding this value may cause instability or oscillation in the module. It's recommended to use a capacitance value that is as low as possible while still meeting the required hold-up time and output ripple requirements.
• Can I use this module in a high-vibration or high-shock environment?
  The VHB75W-Q48-S12 is designed to meet the requirements of IEC 60950-1 and UL 60950-1, but it's not specifically designed for high-vibration or high-shock environments. If your application requires such conditions, CUI recommends consulting with their application engineers to discuss possible modifications or custom designs.
• What is the MTBF (Mean Time Between Failures) of this module?
  The MTBF of the VHB75W-Q48-S12 is calculated to be approximately 1.5 million hours at 25°C, based on MIL-HDBK-217F calculations. However, this value may vary depending on the specific application and operating conditions.