I have a design with two LT8640S devices. They are set to generate 12V from a 24V input. One is used to power devices on another board. The other powers on-board devices. The LT8640S for the off-board devices works fine and generates 12V. The LT8640S for the on-board devices never comes up. It generates 2.428V. I verified that there is not a problem with the board by removing the inductor and attaching a bench supply. Both supplies have identical schematics. The LT8640S is set for FCM with a switching frequency of just over 1 MHz. RT=40.2k. Do you hve any ideas about what could cause this?