VIPER22ASTR-E datasheet by STMicroelectronics

VIPER22ASTR-E Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal performance of VIPER22ASTR-E?
  STMicroelectronics recommends a 4-layer PCB with a solid ground plane, and a separate layer for the high-voltage traces to minimize electromagnetic interference (EMI).
• How do I ensure reliable start-up of the VIPER22ASTR-E in my design?
  To ensure reliable start-up, ensure that the input voltage (VIN) is within the recommended range, and the output capacitor (COUT) is properly sized to handle the output voltage ripple. Also, ensure that the feedback resistors (RFB1 and RFB2) are correctly sized to set the output voltage.
• What is the maximum allowed output current of the VIPER22ASTR-E?
  The maximum allowed output current of the VIPER22ASTR-E is 2A, but it can be limited by the thermal performance of the package and the PCB design. It's recommended to derate the output current based on the ambient temperature and the thermal design of the system.
• How do I protect the VIPER22ASTR-E from overvoltage and undervoltage conditions?
  To protect the VIPER22ASTR-E from overvoltage and undervoltage conditions, use a voltage supervisor or a reset IC to monitor the input voltage and shut down the device if it exceeds the recommended range. Additionally, consider using a TVS diode or a zener diode to clamp the input voltage.
• What is the recommended input capacitor value for the VIPER22ASTR-E?
  The recommended input capacitor value for the VIPER22ASTR-E is 10uF to 22uF, with a voltage rating of at least 50V. The capacitor should be placed as close as possible to the VIN pin to minimize noise and ripple.