VIPER22AS datasheet by STMicroelectronics

VIPER22AS Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal performance?
  STMicroelectronics provides a recommended PCB layout in the 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 VIPER22AS design?
  The transformer selection depends on the input voltage, output voltage, and power rating of your design. STMicroelectronics provides a transformer selection guide in the datasheet, and you can also use online tools such as the STMicroelectronics Transformer Selector to find a suitable transformer.
• What are the thermal management considerations for the VIPER22AS?
  The VIPER22AS has a high power density, so thermal management is crucial. Ensure good airflow around the device, use a heat sink if necessary, and follow the thermal design guidelines in the datasheet to prevent overheating and ensure reliable operation.
• How do I implement overvoltage protection (OVP) with the VIPER22AS?
  The VIPER22AS has a built-in OVP feature that can be enabled by connecting the OVP pin to a voltage divider network. The OVP threshold can be set by selecting the appropriate resistor values, and the datasheet provides a calculation formula to determine the required resistor values.
• What are the EMI considerations for the VIPER22AS?
  The VIPER22AS is a switching converter, and EMI can be a concern. To minimize EMI, follow the layout guidelines in the datasheet, use a shielded transformer, and add EMI filters such as common-mode chokes and capacitors to the input and output lines.