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this post was submitted on 24 Nov 2024
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Asklemmy
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Lemme throw a wrench into everything. Sometimes faster charging can be better than slower charging.
Part of the USB power delivery spec is PPS or programmable power supply. PPS lets your device specify the exact voltage down to 0.02V or 20 mV. Heat is generated by inefficiency, and PPS' goal is to get the voltage just right so there's as little power loss as possible. My iphone charging at 5v 1amp "slow" charging gets hotter than the full 20 watts fast charging.
The primary difference here is where the power supply duties are performed. With USB PPS it can "outsource" the power supply tasks to the charger. When using "classic" fast charging (e.g. 5v / 2A) the phone has to handle all the voltage conversion internally, which adds heat to the device.