VIPER22AS-E datasheet by STMicroelectronics

VIPER22AS-E Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal performance of VIPER22AS-E?
  STMicroelectronics recommends a 4-layer PCB with a solid ground plane, and a separate layer for the high-voltage traces. The datasheet provides a recommended PCB layout, but it's essential to follow good PCB design practices to minimize EMI and ensure reliable operation.
• How do I ensure the VIPER22AS-E is properly cooled?
  The VIPER22AS-E has a thermal pad on the bottom of the package, which should be connected to a heat sink or a thermal interface material (TIM) to ensure efficient heat dissipation. A thermal resistance of <1°C/W is recommended. Additionally, ensure good airflow around the device and avoid blocking the airflow with components or obstacles.
• What is the maximum allowed voltage on the VCC pin?
  The maximum allowed voltage on the VCC pin is 28V, but it's recommended to keep it below 25V to ensure reliable operation and minimize the risk of damage. Exceeding the maximum voltage can cause permanent damage to the device.
• How do I protect the VIPER22AS-E from overvoltage and overcurrent?
  Implement overvoltage protection (OVP) and overcurrent protection (OCP) circuits to prevent damage to the device. A voltage supervisor or a dedicated OVP/OCP IC can be used to monitor the input voltage and current. Additionally, consider using a fuse or a PTC resettable fuse to protect against overcurrent conditions.
• What is the recommended input capacitor value and type for the VIPER22AS-E?
  A low-ESR ceramic capacitor with a value of 1-10uF is recommended for the input capacitor. The capacitor should be rated for the maximum input voltage and have a low equivalent series resistance (ESR) to minimize voltage ripple and ensure stable operation.