We are using TPS53915 in new designs for
12V to 3.3V, 2.5A
another config for 12V to 5V, 7A
In both modules o/p is not coming and not switching. The design cross checked with Webench and seems to be fine.
Observations for both DC-DC converters
I/p 12 v is there.
EN pin 3 - 5V thro 100 ohm ; also checked ~3 V
VREG - pin 20 - 5V is there
FB pin 23 - showing 0v,
PGOOd pin2 shows 0V
TRIP at pin 25 shows 0v
VBST shows rises up to 5V but after 100 nf Cap it is zero i,e, o/p
So essentially not switching
Please review and let us know your valuable comments
Attached docs.zip file- it has schematics of both DC-DC converters