TPS40075RHLR datasheet by Texas Instruments

TPS40075RHLR Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal thermal performance?
  A 2-layer or 4-layer PCB with a solid ground plane and thermal vias under the device can help to dissipate heat efficiently. It's also recommended to keep the thermal path short and use a thermal pad under the device.
• How do I ensure the device is stable and doesn't oscillate?
  To ensure stability, it's essential to follow the recommended layout and component placement guidelines, use a low-ESR output capacitor, and add a small ceramic capacitor (e.g., 10nF) between the VIN and GND pins to filter out noise.
• What is the maximum input voltage that can be applied to the device?
  Although the datasheet specifies a maximum input voltage of 18V, it's recommended to limit the input voltage to 15V to ensure reliable operation and prevent damage to the device.
• How do I calculate the output voltage ripple and noise?
  The output voltage ripple and noise can be estimated using the equations provided in the datasheet. Additionally, the output capacitor's ESR and ESL, as well as the inductor's DCR, can affect the output voltage ripple and noise.
• What is the recommended input capacitor type and value?
  A low-ESR ceramic capacitor (e.g., X5R or X7R) with a value between 4.7uF to 10uF is recommended for the input capacitor. This helps to filter out input noise and ensure stable operation.