Bill ...... you appear to be confusing CC with CV .....
CC is usually a format used with a User programmed charger where you can charge different battery's etc. Unless the CC is low enough to be safe to be a fixed rate for a specific use.
If your 12A 5V supply you connected was CC - then it would try to thump 12A into that USB connection. It would not care about what its connected to.
As you say it will only supply 1A because that is what controller demands - that shows your supply is CV.
Nigel
CC is usually a format used with a User programmed charger where you can charge different battery's etc. Unless the CC is low enough to be safe to be a fixed rate for a specific use.
If your 12A 5V supply you connected was CC - then it would try to thump 12A into that USB connection. It would not care about what its connected to.
As you say it will only supply 1A because that is what controller demands - that shows your supply is CV.
Nigel