Hi,
I have problems with non-monotonic power supply on the left side of the circuit (1.8V @ 1.5A) while the other side (3.3V @ 2.5A) is okay. You can view the schematic on the first picture.
Non-monotonic power supply can be seen on the second picture, marked with yellow color. When something occurs, TPS54291 stops switching (same picture, pink color) and Vout drops and then turns on again.
I've calculated component values (Lmin ~ 5.7 uH) and chose 8.2uH for which the minimum capacitor value is ~22.78uF where I took actual value of 22uF. I've also tried with 6uH and 22uF.
I've summed up total capacitance on the 1.8V trail and it is below the maximum. We assume that maybe overcurrent is detected, but we're not sure. Do you think maybe something else is happening?
Regards,
Filipa Bobinac
I