"According to the official specs, the 20 minute time is achieved using Apple's new 40W Dynamic Power Adapter with 60W Max. First, that's a terrible name for a charger. Second, let's be clear - it's a 40W charger that can deliver 60W for a limited amount of time (over 15 minutes, according to early tests). The important thing is that this charger uses the new Adjustable Voltage Supply (AVS) protocol instead of the older Programmable Power Supply (PPS)."
"AVS allows the device (the iPhone, in this case) to request a certain voltage, ranging from 15V to 48V in 0.1V steps. Which is great for high-power devices, but good ol' PPS can easily handle 40W and even 60W. Chances are that whatever USB charger you have at home does not support AVS - but it might support PPS. That's not the case with Apple's new adapter, however."
iPhone 17, 17 Pro and 17 Pro Max can reach 50 percent charge in 20 minutes, while iPhone Air reaches 50 percent in 30 minutes. The advertised 20-minute speed relies on Apple's 40W Dynamic Power Adapter with 60W Max, a 40W charger that can briefly deliver 60W for a limited time. The adapter uses the Adjustable Voltage Supply (AVS) protocol, which lets the device request voltages from 15V to 48V in 0.1V steps. AVS targets higher-power delivery, while Programmable Power Supply (PPS) can already handle 40W–60W. Early teardown testing found the adapter lacks PPS support, limiting compatibility with many existing PPS chargers and reducing usefulness for PPS-enabled devices. Whether iPhone 17 models can match the 20-minute charge speed and efficiency on third-party PPS chargers remains to be tested.
Read at GSMArena.com
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