TPS79901DDCR datasheet by Texas Instruments

TPS79901DDCR Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for the TPS79901DDCR to minimize noise and ensure stability?
  A good PCB layout for the TPS79901DDCR involves placing the input and output capacitors close to the device, using a solid ground plane, and keeping the power traces short and wide. Additionally, it's recommended to use a star-ground configuration and to avoid routing high-frequency signals near the device.
• How do I ensure the TPS79901DDCR is stable and doesn't oscillate?
  To ensure stability, make sure to follow the recommended PCB layout, use a sufficient output capacitor (at least 1uF), and add a small ceramic capacitor (around 10nF) between the VIN and GND pins. Additionally, ensure that the input voltage is within the recommended range and that the device is not overheating.
• What is the maximum input voltage that the TPS79901DDCR can handle?
  The TPS79901DDCR can handle input voltages up to 5.5V, but it's recommended to keep the input voltage below 5V to ensure reliable operation and to prevent overheating.
• Can I use the TPS79901DDCR in a high-temperature environment?
  The TPS79901DDCR is rated for operation up to 125°C, but it's recommended to derate the output current and input voltage as the temperature increases. Additionally, ensure that the device is properly heatsinked and that the PCB is designed to handle high temperatures.
• How do I calculate the output voltage of the TPS79901DDCR?
  The output voltage of the TPS79901DDCR is set by the resistive divider network connected to the FB pin. The output voltage can be calculated using the formula: VOUT = 0.8V x (R1/R2 + 1), where R1 and R2 are the resistors in the divider network.