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Bookmark or Share- What is the power output of a USB port? - Super UserPower that must be delivered by a USB port is defined in Section 7.2.1 of USB 2.0 Specifications. To start, the power delivery is defined in "units of load". For USB 2.0 one unit is 100 mA, and for USB 3.x one unit is 150 mA. USB standard defines two classes of USB ports, "high-power ports", and "low-power ports" The specs says, page 171:
- Does USB C Power Delivery also support data transfer?The dock takes these three paths and breaks them out into the various ports on the dock. The power path goes to the USB-C power input port. The USB 2.0 and USB 3.x paths go to USB-A ports. If there is a video path, most often DisplayPort but it could be MHL, goes to a video port.
- Power rating of USB 3 type A and type C - Super UserIn reality, most USB ports can output more current than the standard defines but a standard-compliant device will not draw more power than the standard allows. According to the USB standard the following limits apply: USB-A port 2.0: 0.5A; USB-A port 3.0 (now called USB 3.1/3.2 Gen 1): 0.9A
- Do many desktop and laptop computers provide 10W or more over USB?Since the +5VSB rail is also responsible for functionality of power on-off buttons and sleep functions of PCs, overloading USB can have consequences. In more reputable PC the USB ports might have controlled high-side power switches with current cut-off limit. The ports are usually paired, so the provider capability is about twice the USB standard.
- How do I determine if my laptop can charge through USB-C?Then, Charging over USB type C is done using the USB type C Power Delivery specification. According to that specification, the maximum power that may be supplied over USB type C is 100 Watts (5 Ampere at 20 Volts). The output of your laptop's power supply is way higher than that, 180 Watts. Not surprising, regarding the hardware of your laptop.
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