Xedain 3 usb QC3 charger XHF30W (XBX18)

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Official specifications: I got it from a Aliexpress dealer: XEDAIN Official Store

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This charger did not include a box or instruction sheet.

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Measurements


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The first 2.4A output can only deliver about 2.2A

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Same with the second 2.4A output.

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Even when in parallel the maximum current is 2.2A

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The QC3 output can deliver a bit above 2.5A on 5V (Rating says 3A).

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The current is about the same at 9V.

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Even at 12V it can deliver 2.5A

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Running all outputs I could draw 2.2A at 5V and 1.7A at 12V

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And the same at 230VAC input.

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For load test I did 2.1A on 5V and 1.5A on QC 12V for one hour.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp5201

M1: 66.9C, M2: 44.5C, HS1: 81.0C
HS1 is the circuit board transferring heat to the enclosure, probably from the transformer.

Temp5202

M1: 56.1C, HS1: 89.0C
HS1 is the transformer.

Temp5203
M1: 58.0C, HS1: 72.6C

Temp5204

M1: 68.9C, HS1: 96.9C
HS1 is again the transformer and it is very hot. It might not be too hot for the transformer, but is rather hard on the capacitors next to it.

Temp5205

M1: 55.1C, M2: 77.4C, HS1: 88.9C

10ohm

Noise at 0.5A load is: 13mV rms and 159mVpp.

5ohm

Noise at 1A load is: 29mV rms and 246mVpp.

2.5ohm

Noise at 2.5A load is: 45mV rms and 255mVpp.

10ohmQC

Noise at 0.5A QC load is: 13mV rms and 159mVpp.

2.5ohmQC

Noise at 2.5A QC load is: 22mV rms and 175mVpp.

10ohmQC12V

Noise at 12V 1.2A QC load is: 20mV rms and 142mVpp, generally the noise is fairly low.



Tear down

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A squeeze with my vice and I could remove the bottom of the charger.

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At the input is a fuse (F1) and transient protection (Blue MOV). The switcher is the switcher transistor (U1) and the switcher controller (U1) with opto feedback (Near U3). There is a safety capacitor (CY1) next to the opto coupler.
On the low volt side is a rectifier transistor (Q2) with a controller chip (U8) for synchronous rectification. This circuit gives 12.7V and uses a reference (U3: 431) for feedback).
Behind the usb connectors are two inductors (L2 & L?) with each a switcher controller below them (U? & U6), there is no rectifier diodes, i.e. it must be synchronous buck converters.
Between the usb connectors is the auto coding chip (U?: RZC7512) two usb connectors and the QC chip (U6: FT4).
There are two leds.

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There is not much on this side, except the bridge rectifier.

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With a slot in the circuit board the safety distance is supposed to be 4mm, here it is 2mm. Without a slot it is more like 6mm, but here it is only about 4mm. I.e. the charger do not live up to minimum safety distance for 230VAC (It has US plug, but is marked that it support 240VAC).

Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.



Conclusion

The charger do not have the rated power on any of the outputs and the safety distances are on the low side, it do also get very hot. The QC chip used supports a lot of formats.



Notes

Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger
How does a usb charger work?