Homemade Phone Charger Won't Charge more than 80mA? Answered
I have a homemade linear power supply that can supply 5.1V up to 1.3A. I want to use it to charge a USB device such as a phone. However, the phone is "slow charging" at 80mA. I have tried connecting the data inputs together and then tried setting both data inputs to 2.75V (I have a throw away charger that I measured that voltage from). Both results still only have 80mA going through. How can I make it so the phone accepts a higher current? Is there a specific voltage the data inputs have to be at?
I know chargers now "talk" to the phone but I'm just using my power supply as a "dumb charger". Charging the phone is supposed to be a proof that the supply can work.
I'm using a Samsung Note 4 and a Note 9 for phones to try charging.