21st #USB #TypeC
analysis is my first PowerDelivery 2.0 supply tested: the dodocool 30W with USB-PD (5/9/15/20). [Model DA66WUS]tl;dr: Works great! Power Rules compliant! This is now my recommended Type-C charger.
But (optional) 20 volt profile is a bit glitchy at times.https://www.amazon.com/dp/B01GVDVEMM
[PDF of Compliance Checklist for dodocool DA66WUS]https://drive.google.com/open?id=0B2OJRSgNnm4GTHptdm9wMzM4dGc
This is actually a pretty darn good charger! It is now my go-to recommendation, above even the Google 22.5W. This is half the cost, supplies USB-PD (so you can even charge your laptop), and additionally supports IR Drop Compensation!
"IR Drop compensation" is GREAT! It means the charger boosts voltage to output a flat 5.00V at load. This means USB-C noncompliant devices like the Nexus 6P which require >4.95v to charge, function perfectly fine.
The cord that is included with it isn't amazing -- it's a regular USB 2.0 C-C that has a rather high IR drop -- but considering the price it's hard to argue. Also, the fit and finish of the packaging/box is excellent.
The biggest complaint I have is that it doesn't properly advertise the 20v PDO (Power Delivery Object) in the USB-PD communications. It suffers from a "Split PDO" issue, which is described by +GTrusted
in their article below. It seems to predominantly affect certain chipsets. (Like the one Anker/iVoler uses.)http://gtrusted.com/review/51702
This means it advertises different voltages at different times, and may cause problems. (For example, my Twinkie couldn't trigger the 20v object, so I couldn't run any 20v tests.) I've also read reports it MAY have issues with Apple passthrough-charging hubs. I need to test this more.
However +Benson Leung
has confirmed it works perfectly fine on a Dell laptop/Chromebook Pixel at 20V. So just keep that in mind when buying it. #USBC