Expected Functionality: We expect to be able to apply up to 60V DC input and regulate out to +12V using the LT8390
Issue:When voltages > 17.5V are applied to the input (+VBATT), the output of the LT8390 begins to oscillate. At input voltages < 17.5V the output is regulated as expected.
Please review schematic/bom and help us locate the issue.
Please used LTPowerCad VII to aid in your design
A quick check indicates that the inductor used is smaller than the recommend value by the software.