So does that mean that normal USB A connector for some reason can't handle the current? That seems odd.
Re:Google Nexus 5x and 6P
by sbierwagen on Tuesday September 29, 2015 @03:01PM
(#10298669)
Yes, in fact. USB1 tops out at 2.1A, USB3 here is 3A. (Watts is volts times amps. 15W/5V = 3A)
USB Power Delivery chargers can deliver quite a lot more.
I'm only talking about the physical connector.
Re:Google Nexus 5x and 6P
by sbierwagen on Tuesday September 29, 2015 @04:52PM
(#10299545)
Well if you go by the spec then USB1 and USB2 can only deliver 0.5A. Apple seems to have settled as 2.1A as the most current you can run through a USB connector without getting it too hot.
Re:Google Nexus 5x and 6P
by Dylan16807 on Wednesday September 30, 2015 @02:26AM
(#10302138)
The power delivery spec requires special cables but allows 5 amps over normal* type A connectors.
*except for a detection mechanism for higher-power cables
Not sure about the connector, but I have heard reports that some cheaper USB cables with thinner-gauge wires already cannot handle the current from some chargers that are on the market.
I can imagine USB-C only makes this more of a concern, since the USB Power Delivery spec allows up to 5 A @ 20 V.
They mention: "15W of power so you can charge your USB Type-C enabled phones and tablets quickly. Also works with large USB Type-C devices, like laptops.¹".
And the footnote: "¹Wattage is optimized for smaller devices, like phones and tablets. Larger devices, like laptops, will take longer to charge. Delivers maximum charge speed to Nexus 5X and Nexus 6P. Charge time depends on USB Type-C device. Larger devices, such as the Chromebook Pixel, will typically need more charge time with this adapter (Pixel estimated charge time is 5.6 hours at 15W with system off)."