Part Number: TPA3255
I have an issue with my design, the previous board spin worked, made a few minor changes and not the new boards come up with a fault indication with the reset asserted. I looked at the voltages but could not find the value for VBG pin in the data sheet just that it is an internal reference. The 3255 is not powering up the AVDD supply. From the datasheet I assume that the PPSC system is activating but when measured with an ohm meter I see no shorts between outputs and ground or PVDD. Trying to understand if something else is influencing that system or if the method for measuring the short is interacting with my system. Output filter is pretty much the eval board values.
Problem went away when filters disconnected so I assume this is something I did, but would still like to understand the PPSC system and the VGB reference a little bit better.
Thanks