VIPER37LE datasheet by STMicroelectronics

VIPER37LE Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal performance of VIPER37LE?
  STMicroelectronics provides a recommended PCB layout in the application note AN4571, which includes guidelines for component placement, routing, and thermal management to ensure optimal performance and reliability.
• How do I select the right transformer for my VIPER37LE-based design?
  The transformer selection depends on the input voltage, output voltage, and power rating of the design. STMicroelectronics provides a transformer selection guide in the datasheet, and also recommends using a transformer with a turns ratio of 1:1.2 to 1:1.5 for optimal performance.
• What is the maximum ambient temperature for reliable operation of VIPER37LE?
  The maximum ambient temperature for reliable operation of VIPER37LE is 85°C, but it can be derated to 70°C for high-reliability applications. It's essential to ensure proper thermal management and heat sinking to maintain a safe operating temperature.
• How do I ensure electromagnetic compatibility (EMC) compliance with VIPER37LE?
  To ensure EMC compliance, follow the layout and routing guidelines in the application note AN4571, use a shielded transformer, and add EMI filters and shielding to the PCB design. Additionally, ensure that the design meets the relevant EMC standards and regulations.
• What is the recommended input capacitor value and type for VIPER37LE?
  The recommended input capacitor value is 1-2.2 μF, and the type should be a low-ESR ceramic or film capacitor. The capacitor should be placed close to the VIN pin and have a low impedance path to the input voltage source.