TLDR: what are the potential issues with boosting a 13V power source using a boost converter (6A) to say 16V, and then reducing it to 12V using a 6A step down regulator?
I am trying to power a 12V circuit off a 12V car/marine battery source. In the circuit is a 12V LCD screen (2.5A) and a 12V data overlay device (0.2A). The manufacturer of the overlay specifically states the device requires tightly regulated 12V.
When I use a typical step down regulator, there is a large voltage drop, which I understand is a function of the regulator (since the battery max voltage is around 13V). At 13V the voltage drops to 11.3, I want to avoid this to protect the overlay. The other issue with this setup is that the voltage swings as the monitor powers up, lights up, goes into standby etc, again which I want to avoid.
Note, would prefer to use off the shelf parts or modules as I am not an engineer.
Any advice much appreciated. Cheers