VIPer20A datasheet by STMicroelectronics

VIPer20A Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal performance?
  STMicroelectronics provides a recommended PCB layout in the VIPER20A application note (AN4571) which includes guidelines for component placement, thermal management, and routing to minimize electromagnetic interference (EMI) and ensure reliable operation.
• How do I select the right transformer for my VIPER20A design?
  The transformer selection depends on the input voltage, output voltage, and power rating of the VIPER20A. STMicroelectronics provides a transformer selection guide in the VIPER20A datasheet, and also recommends using transformers from approved vendors such as TDK, Coilcraft, or Würth Elektronik.
• What is the maximum ambient temperature for reliable operation?
  The VIPER20A is rated for operation up to 150°C junction temperature, but the maximum ambient temperature depends on the specific application and cooling conditions. As a general guideline, STMicroelectronics recommends keeping the ambient temperature below 85°C for reliable operation.
• How do I ensure electromagnetic compatibility (EMC) compliance with the VIPER20A?
  To ensure EMC compliance, follow the guidelines in the VIPER20A application note (AN4571) for PCB layout, component selection, and shielding. Additionally, use a common-mode choke and Y-capacitors to filter the input and output lines, and consider using a metal enclosure or shielded cables to reduce radiated emissions.
• What is the recommended input capacitor type and value for the VIPER20A?
  STMicroelectronics recommends using a low-ESR ceramic capacitor (X7R or X5R dielectric) with a value between 1uF to 10uF, depending on the input voltage and frequency. The capacitor should be placed close to the VIPER20A input pins to minimize noise and ensure stable operation.