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usb fastcharge / QC4.0 12v

isoking

New Member
Im building a multi power charge station, i was wondering if anyone has a plan / schematic for a samsung / iphone quick charge usb? the input source is 12v. I was looking at car chargers but they are $15 each and when i want 4 or 5 its a bit expensive. I was hoping for 1 or 2 IC circuits with a few outputs on them.
 

ronsimpson

Well-Known Member
Most Helpful Member
Input voltage 12 to 15 volts.
Output voltage 5.0 volts.
How many outputs? How much current? (each or total)
Do you want the outputs independent? If one output is shorted out the rest work.
OR Are the outputs dependent? If one output is shorted then the rest do not work.
 

isoking

New Member
Thanks ron for the reply.
I want 8 outputs. I thought fastcharge / quick charge was a higher voltage.
 

dougy83

Well-Known Member
AFAIK, chargers signal that they can provide a higher current by using resistor dividers on the USB data pins. See https://electronics.stackexchange.com/questions/177788/how-do-i-design-a-2a-or-more-power-supply-for-my-consumer-usb-devices/177792

You can get 12V -> 5V/3A converters (you need to adjust the output voltage) for $1 each. Use one per charger output. See https://www.ebay.com.au/itm/Mini-3A-DC-Spannungsregler-Wandler-Buck-Converter-Step-Down-Module-LM2596-2596S/263179710165

You may want to adjust the output voltage to 5.2V to make up for voltage drop in thin USB cables.
 

dougy83

Well-Known Member
They look like they do the things you're expecting (i.e. fast charging Android and iPhone, with varied voltages), and you don't need to fool around with the extra resistors or connectors.
 

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