Aukey USB Turbo charger PA-U28


Official specifications: I got it from dinodirect sku:X0001BQWLN

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I got this charger in a fairly plain cardboard box with a white wrapper.


The box contained the charger, a usb cable and a instruction manual.

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At normal usb output the charger can deliver 2.2A, then the overload protection cuts in. This fits very well with the 2.1A rating.


At 9 volt Quick Charge the output can deliver slightly above 2A, before the output drops and overload protection cuts in at 2.2A.


At 12 volt Quick Charge the output can deliver slightly above 1.5A, before the output drops and overload protection cuts in at 2.2A.
In all cases the efficiency looks good.


There is no problem maintaining the output for one hour, the noise at 45 minutes is because I moved the charger around to get the IR photos.


Running with 12V output works just as well.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.


M1: 47,3C, M2: 47,7C, M3: 47,7C, M4: 38,2C, HS1: 49,5C
With 5 volt 2 A output. HS1 is the rectifier transistor, M2 is the controller IC and M3 is the snubber diode.


M1: 46,7C, HS1: 55,0C
HS1 is the transformer.


M1: 43,2C, HS1: 49,8C


M1: 40,4C, HS1: 47,9C
HS1 is the rectifier transistor and the heat on the usb connector is probably from this transistor.


M1: 55,0C, HS1: 57,0C
With 12V 1.5A output. HS1 is the snubber diode and M1 is the controller IC, both get warmer with higher output power.


M1: 55,0C, HS1: 65,6C
With 12V 1.5A output. HS1 is the transformer, it gets warmer at this higher power output.


The noise is very low with 13mV rms and 140mVpp


A slight increase in noise with 1A load 18mV rms and 150mVpp


Even with 2A load the noise is low 23mV rms and 170mVpp


Same with Quick Charge at 9V: 24mV rms and 190mVpp


And at 12V: 18mV rms and 180mVpp

Tear down

Aukey has published a rendering showing the inside of this charger, but it is fiction and would not pass any safety test. The points that is listed for the charger is present in the charger and can be found below, many of them just look different than the rendering.


I mounted it in my vice and hit it a few times with the mallet to open it.


At the mains input there is a fuse and a common mode coil (partial hidden in the white stuff). There is an inductor close to the black wire (Also partial hidden in the white stuff).
Beside the trafo is a safety capacitor.

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Here the blue safety capacitor (CY1) is easier to see.

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The red block is the 2A input fuse, both the inductor and the common mode coil can be seen.
The black part at the black wire is surge protection.


U1 us a SC1223K that is a mains switcher and has output for controlling synchronous rectification (Q1). The chip has very low standby power and is tested with 6000 volt, but it do not have any support for QuickCharge. This must be provided by U2 (PHY100).
In addition to these parts there is DB1 that is the input bridge rectifer.



It looks like the isolation distance is 6.4mm.

Testing with 2500 volt and 5000 volt between mains and low volt side, did not show any safety problems.


This is a good USB charger with Quick Charge support, it has low noise and deliver exactly what it is supposed to do.


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