Thanks for providing the schematics! This clarifies a lot. I've been reviewing them, and I have some additional thoughts and questions.
1. vBus Voltage Instability & Dropping Voltage:
Looking at the schematic, the output capacitor (C188, 10uF…
I can't say there is anything I know of that is "widely" used. This is not a common use case in automotive LED lighting. If you have the LDP5531EVM then I would probably modify it to see if you can achieve the desired output power. When…