WARNING on USB Charging Ports!
Just wanted to post a warning to everyone who has the built in USB charging ports on their camper/RV. We have a 2017 Grey Wolf 29BH that has 6 of these through out the camper, 3 of which are in the b...
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Since I am going to replace these anyway, I am going to do some load testing one of the "good" ones to see what they can actually safely handle.
The biggest problem with the design is that it does not follow the USB Charging specifications. That specification requires different voltages present on the D+ and D- lines that allow the phone to determine how much current it can draw. These devices in the trailer do not have any of that circuity. all it is is a buck switching regulator made by XLSEMI (part number XL2010E1) (which has no website BTW, all I can find is datasheets from xlsemi.com, but I f try to go to a home page I get a DNS error. I am assuming they have just poorly copied a TI or linear design).
The biggest problem with the design is that it does not follow the USB Charging specifications. That specification requires different voltages present on the D+ and D- lines that allow the phone to determine how much current it can draw. These devices in the trailer do not have any of that circuity. all it is is a buck switching regulator made by XLSEMI (part number XL2010E1) (which has no website BTW, all I can find is datasheets from xlsemi.com, but I f try to go to a home page I get a DNS error. I am assuming they have just poorly copied a TI or linear design).
