Hi Ibran,
UCC2897A requires at least 13.2 V for start-up so please be sure your minimum input voltage is always >13.2 V to guarantee proper startup. You can search the TI reference design librar y but PMP5117 and PMP8366 are two examples of UCC2897A…
Lok
The best place to start is usually to search the database of available TI-Designs:
www.ti.com/.../refdesignsearchresults.tsp
Click on the "search power reference design parameters" button. Then you can search by input voltage range, output voltage…