What USB-PD power profiles does the 87W adapter support? Is a 100w/5a rated USB-C cord required, since this exceeds 60w?
I would like to know if this adapter follows the USB-PD specification "power rules" for interoperability with other USB-C devices and cables.
2 Answers from the Community
From my research and (limited) experience it follows USB-PD 2.0 power rules, but also implements some (allowed) vendor-specific extensions.
You should be able to use it with a compliant 3A USB-C cable, but power will be limited to 3A/60W with a USB-PSD device that can accept 20v. You'll need a proper 5A/100W cable to make full use of its capabilities.
I've used it to charge an iPhone 6 with a USB-C to USB-A adapter and measured it providing 5V at ~1.6A (the max an iPhone 6 will draw). I've also used it to charge a RavPower USB-PD capable external battery over USB-C. I don't have any way of directly measuring the power delivered, but I'd estimate it's ~30W.
If you are curious, the "GTrusted" website has some detailed looks at how various USB-PD devices and chargers interoperate.
- Answered by Erik S from Seattle
- Flag as inappropriate Answer 1
It is noncompliant with section 10.2.2 (Normative Voltages and Currents) of the USB Power Delivery 2.0 or 3.0 Specification inasmuch as the 5V rail offers only 2.4A (the standard requires 3A for all chargers >15W) and the 15V rail is absent (the standard requires it to be present, and to supply 3A, for all chargers >45W).
The 9V rail is 3A and the 20V rail is 4.3A (86W).
Yes, an E-Marked 5A cord is required for operation >60W; if you use a 3A cord, it will only supply 20V at 3A (60W).
- Answered by Alexander B from Barcelona
- Flag as inappropriate Answer 2
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