I have this charger: http://www.shintaro.com.au/product/shintaro-multi-device-charger/
It supports QC3.0 and has:
Output USB-A DC 3.6-6.5V/9V/12V/14.5V/16V3A/19V/20V3.5A QC3.0 USB-C DC 5V/9V/12V/15V/18V/20V3A
i connected a 2pin 12v computer fan to one of its USB-A port and the multi-meter suggested that the charger is outputting 30v
obviously, a 2 pin fan does not support any kind of charging protocol, why did it still getting a > 5v voltage?
How does the charger decide its output voltage for old device like old iphones(5V 1A), or when D+/D- pins are not connected(like my fan)?
I plan to drive a WS2812B RGB LEDs Strip (60 leds, DC 5V, 18W) with the charger, how can i control its output voltage?
i think its defaulting at 20V output on USB-A, while everyone is suggesting that the default output should 5V when there is not any negotiation
not connected to any device
connected to a fan
connected to arduino