VIPER17HN datasheet by STMicroelectronics

VIPER17HN Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal performance of VIPER17HN?
  A good PCB layout for VIPER17HN involves keeping the high-current paths short and wide, using a solid ground plane, and placing the input and output capacitors close to the IC. A 4-layer PCB with a dedicated power plane and a solid ground plane is recommended.
• How do I ensure reliable start-up of VIPER17HN in my design?
  To ensure reliable start-up, ensure that the input voltage rises slowly (dv/dt < 50 mV/μs) and the input capacitor is large enough (≥ 10 μF) to filter out voltage spikes. Also, add a soft-start circuit to limit the inrush current.
• What is the maximum allowed temperature range for VIPER17HN operation?
  The VIPER17HN can operate safely within a temperature range of -40°C to 150°C (junction temperature). However, the maximum allowed ambient temperature is 85°C, and the device should be derated above 70°C to ensure reliable operation.
• How do I protect VIPER17HN from overvoltage and undervoltage conditions?
  Use a voltage supervisor or a dedicated overvoltage protection (OVP) circuit to detect and respond to voltage faults. For undervoltage protection, use a voltage detector or a brown-out detector to reset the system or shut down the power supply.
• What are the key considerations for EMI filtering with VIPER17HN?
  To minimize EMI, use a common-mode choke and a differential-mode filter at the input, and a shielded cable or a ferrite bead at the output. Ensure that the PCB layout is optimized for EMI reduction, and consider using a metal enclosure or a shielded case.