Hello,
I am currently working on a USB 2.0 bus powered application that I expect to consume more than 2.5W.
As such, I wish to use two USB ports to power the application in a similar manner to that used on some USB bus powered external hard drives.
Has anybody had any success in implementing such a scheme and remaining USB
2.0 compliant? In particular, I wish to "politely" request 500mA from the USB host for the second (power-only) port rather than assuming that 500mA will be automatically available.Does anybody know of any circuit implementations available on the web that will implement the two port scheme - fully compliant or otherwise?
Any recommendations on how to do it?
Any advice on any gotchas, etc. to watch out for?
Any help would be greatly appreciated.
Many thanks,
Kieran