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USB-PD tag relates to the Power Delivery extension of the USB spec. USB-PD is capable of support up to 100W of power through negotiation between spec-compliant USB phys.

The USB-PD extension specification relates to the USB specification. Basically it exclaims that devices may negotiate for up to 100W of power to be delivered to them from the host.

There are a few articles relating to this capability:

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