I want the possibility to charge my Laptop (19V/3.42A, Acer Aspire 5 A515-52G) from a power bank. Since my laptop only has the ordinary barrel power connector but power banks usually come with a USB-C PD 45W (20V/2.25A) port, I'm planning to use a USB-C to 20V DC Trigger (this thing requests 20V constantly from the USB PD charger.
The USB PD rev. 2.0/3.0 source power rules however define 2.25A as the minimum current for 20V. If my laptop is in a low power scenario and requires less than 45W, only the amperage may go below 2.25A. How does a USB PD charger/power bank behave in this scenario? Will it deliver lower amperage or refuse to work entirely?