I need a DC-DC converter (buck or boost) that will ramp up and down with the power switch. Continuously or step variable. Output power up to about 10A. If you can give me a recommendation, please help.
A lot of questions:
Specifically what type of lighting are you driving, incandescent, LED, and if latter does it use a driver? What kind of load current?
What ramp up/down times are you looking for, i.e. 1 second, or 5-10 seconds etc. I take it this is for aesthetic purposes?
Depending on the light, ramping its voltage up and down linearly may not produce the result you want.
Are you able to narrow down the input and output voltage ranges? Does it actually need to buck and boost? Those types are typically more complex and expensive than a pure buck or boost converter.
Rather than a special power supply which might require ramping for lab or testing use, it may be easier/cheaper to add a circuit/module between supply and lighting. I don't have specific suggestion at this point.
Looking at the eBay items, I'd be a bit skeptical of some of their specs, at those prices.
What's your budget for all of this?
Dave