TTBy Tonetron Engineering Team · Dongguan Taitron Electronic Limited
Is an E-Marker mandatory for 240 W, and does it guarantee 240 W?
Mandatory for 5 A — but a mis-programmed E-Marker is the most common reason a 240 W cable only charges at 100 W.
Answer: the E-Marker is mandatory for 5 A — and no, its presence alone does not guarantee 240 W.
Ask which E-Marker IC is used and whether its firmware reports 5 A EPR correctly. A mis-programmed E-Marker is the most common cause of a 240 W cable that only charges at 100 W.