3 ms·
I don't recall if this is "standard" or not, but some devices have mode where it slowly ramps up the current until the voltage starts to drop. IIRC, this is a
by rolenthedeep 4y ago
I don't recall if this is "standard" or not, but some devices have mode where it slowly ramps up the current until the voltage starts to drop.
IIRC, this is a fallback mode on some TI charge controllers. If it can't detect a capacity signal on the D+/- lines, it reverts to this mode of testing the charger. This was intended to support sketchy Chinese trash chargers that leave the data lines disconnected, and whose real power capacity is a mystery. This strategy lets you pull as much power as the charger will suffer
- LoganDark 4y ago> This strategy lets you pull as much power as the charger will suffer Some chargers will allow you to pull enough power to melt the thing or catch it on fire if they don't have sufficient protections, but it's likely those would have data lines (+ protections) anyway
- rolenthedeep 4y agoWell, that's kind of the point of the check. Except in the most extraordinary conditions, the voltage will drop as you approach the supply's current limit. It takes significant effort to design a circuit that can sustain large amounts of current while keeping voltage constant. There's basically no overlap between that sort of design and cheap Chinese fire hazards.
- LoganDark 4y agoThe point of my comment is that some chargers will melt or catch on fire even if you are pulling "as much as it can handle without voltage drop".