Good evening, I'm looking for some help/ideas about making a multi-port USB charger, instead of having a dozen "wall warts" my idea is to throw everything inside a nice case with about 10 usb outputs.
Here is the actual idea that I have:
Use a dedicated dc-dc regulator to power each USB port, with the capability to change current limit on the fly, and the add a shunt right at the ouput and add an INA199 or an INA3221(3 channel with voltage monitor), but I dont really know any dc-dc regulator that can be used for this effect. Using an lcd show the actual current consumption on each port, and probably warning when there is no current going into the device and maybe add an over-current alarm as well.
My doubts are mainly about two topics, is there any nice/easy to use dc-dc regulator with external current control/current limit to allow modification, and how do I signal the devices(phones, tablets, either Android and Apple flavored ones).
And how do I signal the device that it can sink more than the 500mA that they default to?
I have found this IC's from TI, the TPS2514:
http://www.ti.com/lit/ds/symlink/tps2514.pdfOr do I "only" need to connect D+ and D- with a 200ohm resistor and then pull them up to 0.6v(read that somewhere... ) to allow the high current charging?
EDIT: The somewhere was from this Maxim doc:
http://www.maximintegrated.com/en/app-notes/index.mvp/id/4803Best regards.