VHB75W-Q48-S48 - CUI Inc.

VHB75W-Q48-S48 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 should also be powered up and down slowly to prevent electrical stress.
• What are the derating curves for temperature and altitude?
  CUI provides derating curves for temperature and altitude in their application notes. The module's power rating decreases by 2.5% per 1000ft above sea level, and by 1.5% per 10°C above 40°C ambient temperature.
• Can I use this module in a redundant or parallel configuration?
  Yes, the VHB75W-Q48-S48 can be used in a redundant or parallel configuration, but CUI recommends consulting their application notes and performing thorough testing to ensure reliable operation and to prevent current imbalance or oscillation.
• What is the recommended input and output filtering to minimize EMI and noise?
  CUI recommends using a pi-filter or a common-mode choke at the input to minimize EMI and noise. The output can be filtered using a LC filter or a ferrite bead to reduce ripple and noise.