Lots of misconceptions about how power delivery works over USB-C. Here are a few facts that may help: - USB-C power is negotiated over USB-PD protocol. Dumb de

Lots of misconceptions about how power delivery works over USB-C. Here are a few facts that may help: - USB-C power is negotiated over USB-PD protocol. Dumb devices are going to get 5v at low max. current. - The sink device (laptop) must communicate and specifically ask for voltage/current it needs. Sources (power supply) aren't going to just push the max voltage to any device. - All USB-C cables are required to support 3A of current. For any higher current, the cable must have a chip that advertises its current capabilities. - The new spec imposes further requirement for the cable (in form of extra capability advertised by the chip in the cable). Power supplies will only enable 50v if such a cable is present.