Re:Logic board with 20 USB3 ports
by arcticbull on Monday September 21, 2020 @02:32AM
(#24540462)
Well, that would depend on how much power you're willing to pump through on PD. PD doesn't in and of itself mean the downstream facing port support the full 100W (20V/5A). You could conceivably add a PD billboard and pump out the minimum supported wattage, which I believe is 150mA @ 5V, so 0.75W?
[edit] Looks like PD2.0/3.0 supports 100mA @ 5V minimum. [1]
Now what you could do that would be really neat is have a set power budget for all your ports, say 250W, and allocate that power on a first-come first-served basis. Provide a minimum of 5W per port, and then the rest is allocated in accordance with the power delivery negotiation protocol.
Say you plug in a laptop, it requests 85W, and you give it 85W. This leaves a power budget of roughly (250W - (minimum)(20*5 = 100W) - 85W = 65W).
[edit] Looks like PD2.0/3.0 supports 100mA @ 5V minimum. [1]
Now what you could do that would be really neat is have a set power budget for all your ports, say 250W, and allocate that power on a first-come first-served basis. Provide a minimum of 5W per port, and then the rest is allocated in accordance with the power delivery negotiation protocol.
Say you plug in a laptop, it requests 85W, and you give it 85W. This leaves a power budget of roughly (250W - (minimum)(20*5 = 100W) - 85W = 65W).
[1] https://en.wikipedia.org/wiki/USB_hardware#USB_Power_Deliver...