VN750S-E datasheet by STMicroelectronics

VN750S-E Frequently Asked Questions (FAQs)

• What is the maximum operating temperature range for the VN750S-E?
  The VN750S-E can operate from -40°C to 150°C, but the maximum junction temperature (TJ) should not exceed 150°C.
• How do I properly configure the VN750S-E for low-power mode?
  To enter low-power mode, set the EN pin low, and ensure the VCC pin is below 2.5V. Additionally, disable the internal voltage regulator by setting the VREG pin high.
• What is the recommended PCB layout for the VN750S-E to minimize EMI and noise?
  STMicroelectronics recommends a 4-layer PCB with a solid ground plane, and to keep the VN750S-E away from high-frequency components. Use a decoupling capacitor (e.g., 100nF) between VCC and GND, and a ferrite bead or inductor in series with the power supply line.
• Can I use the VN750S-E with a 3.3V power supply?
  Yes, the VN750S-E can operate with a 3.3V power supply, but ensure the input voltage (VIN) is within the recommended range of 4.5V to 28V. The internal voltage regulator will regulate the voltage to 5V for the internal circuitry.
• How do I troubleshoot issues with the VN750S-E, such as unexpected shutdowns or incorrect output values?
  Check the power supply voltage, ensure proper PCB layout and decoupling, and verify the correct configuration of the EN, VREG, and other control pins. Use an oscilloscope to monitor the output signals and check for noise or oscillations.