UC1708JE datasheet by Texas Instruments

UC1708JE Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for the UC1708JE to minimize EMI and noise?
  Texas Instruments recommends a 4-layer PCB with a solid ground plane, and to keep the switching node (pin 3) as short as possible. Additionally, it's recommended to use a common mode choke and a shielded inductor to reduce EMI.
• How do I ensure the UC1708JE is stable and doesn't oscillate?
  To ensure stability, make sure to follow the recommended component values and PCB layout. Also, ensure that the input voltage is within the recommended range, and that the output capacitor is properly sized. Additionally, adding a small resistor (e.g. 1kΩ) in series with the output capacitor can help to dampen oscillations.
• What is the maximum ambient temperature range for the UC1708JE?
  The UC1708JE is rated for operation from -40°C to 85°C. However, the device's performance and reliability may be affected at extreme temperatures. It's recommended to derate the device's performance and ensure proper thermal management for high-temperature applications.
• Can I use the UC1708JE in a high-reliability or automotive application?
  While the UC1708JE is a reliable device, it's not specifically designed for high-reliability or automotive applications. For such applications, it's recommended to use devices that are specifically qualified for those markets, such as the UC1708JQML or UC1708JT, which have undergone additional testing and qualification.
• How do I troubleshoot issues with the UC1708JE, such as output voltage instability or failure to start?
  To troubleshoot issues with the UC1708JE, start by verifying the input voltage, output voltage, and component values. Check for proper PCB layout and component placement. Use an oscilloscope to monitor the switching node and output voltage. Consult the datasheet and application notes for troubleshooting guides and common pitfalls to avoid.