USB Charger Stand (Making My Own) ?
Cellulars, Kindle, Nook, Yadda. Too many gizmos to count, it seems like. And the ebooks much prefer gentle charge rates (current limiters). Then there is Mexican electricity. In a fit of optimism, I p...
Forum Discussion
mike-s wrote:
If you want to build a 5 volt USB charger which supports multiple devices, you want to look into something like the TI TPS2511, which does the appropriate handshake for different devices.
Better yet is something like the Active Semi ACT4533C, because that covers multi-voltage standards like Qualcomm Quickcharge, but that requires a programmable power supply (per port).
It's up to the device to limit the charging current, not the charger. The charger just tells the device how much power is available.
The simplest charger is just 5.2 volts on the power pins, and the data pins shorted together. That meets the USB charging spec and will cover most devices other than Apple at up to 1.5 amps. 5.2 volts because the spec is 5 +-5%, and many devices will start limiting their charging current as the voltage drops below 5 V, the extra accommodates voltage drop in the cable, is within spec, but still leaves some leeway.
X2 on all of this... Or buy a premade smart charger and Frankenstein it ;)
