Would a Output 1:3.6V-6.5V=3A,6.5V-9V=2A,9V-12V=1.5A be ok to run a Roku Ulta ?
Ultras use a PW-11 power supply, outputting 12vdc @ 1.5 v. As far as I know, Ultras are not equipped to be powered over USB, but only through their barrel connectors as are on the PW-11 (could be wrong).
PW-11 replacement from Roku: https://www.roku.com/products/accessories/roku-power-adaptor-ultra
Third party replacement on Amazon: https://www.amazon.com/Listed-Adapter-Roku-Ultra-Streaming-PA-1120-42RU/dp/B07G24S6GY
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