PD chargers
Confused as to PD usb c chargers is it safe to use on iPad Pro 12.9 as Pd chargers list voltages of 12 to 20v not the usual 5v expected on usb
Question marked as
PD compliant “fast charging” can operate at higher voltages than the “standard” USB 5V. PD chargers will only output 5V - unless they detect connection of a PD-compliant device.
When connected, the PD charger and PD-compliant device will “negotiate” the power needs of the connected device.
The PD protocol exchange ensures that only the required voltage/current is supplied. Initial device connection will always limit supply to 5V; only after the protocol exchange has successfully determined that a PD-compliant device is connected, and the supply requirement has been determined, will the PD charger switch to a higher voltage supply.
It should be noted that there are two major fast-charging standards that operate over USB, these being PD (Power Delivery) and QC (Quick Charge). These two standards are not interchangeable; of devices that support fast charging over USB, the device will support only one or other standard - not both.
Apple devices that support fast charging (recent iPad and iPhone models) all use the PD standard.
It is completely safe to connect standard USB devices to a PD charger. No damage will occur as the PD charger will default to standard 5V supply and charging.
I hope this clarification is helpful.
