Hi,
I really do not have any use of the internal buck converter but the FB_BK pin provides power to the internal DVDD voltage regulator so I at least need a supply voltage there. Is it OK to connect the external 3.3V_logic power we already have in the design to the FB_BK pin? Then, by setting the Buck regulator to 3.3V I assume it will be idle and produce no error states.
Regards
Goran Ekstrom
Apodosis AB
