A recommended PCB layout for optimal thermal performance would be to have a solid ground plane on the bottom layer, and to use thermal vias to connect the exposed pad to the ground plane. This helps to dissipate heat efficiently.
To ensure stability, make sure to follow the recommended component values and PCB layout guidelines. Additionally, ensure that the input and output capacitors are of high quality and have low ESR. Also, avoid using long traces and minimize the loop area of the feedback network.
Although the datasheet specifies a maximum input voltage of 15V, it's recommended to derate the input voltage to 13.5V to ensure reliable operation and to account for any voltage spikes or transients.
While it's possible to use a different inductor value or type, it's not recommended. The recommended inductor value and type are carefully selected to ensure optimal performance and stability. Using a different inductor may affect the device's performance, efficiency, and stability.
To troubleshoot issues, start by checking the input voltage, output voltage, and current. Verify that the component values and PCB layout match the recommended design. Use an oscilloscope to check for oscillations or ringing on the output. Also, check for any signs of overheating or thermal issues.