Texas Instruments recommends a 2-layer or 4-layer PCB with a solid ground plane on the bottom layer to improve thermal performance. Additionally, it's recommended to place thermal vias under the device to dissipate heat efficiently.
To ensure reliable operation at high temperatures, it's essential to follow the recommended operating conditions, including derating the output current and voltage according to the temperature derating curve provided in the datasheet. Additionally, ensure good thermal design and heat sinking to keep the junction temperature within the recommended range.
Texas Instruments recommends using a low-ESR ceramic capacitor with a value of 10uF to 22uF for the input capacitor. This helps to filter out noise and ensure stable operation.
To troubleshoot output voltage instability or oscillations, check the PCB layout for any signs of noise coupling or resonance. Ensure that the output capacitor is properly sized and placed close to the output pin. Also, verify that the input voltage is within the recommended range and that the device is not operating in a dropout condition.
Texas Instruments recommends using a low-ESR ceramic capacitor with a value of 10uF to 47uF for the output capacitor. This helps to filter out noise and ensure stable operation.
PT6885A datasheet
by Texas Instruments
