Baseus 2A USB XT-117

DSC_9403

Official specifications: I got it from aliexpress dealer: BASEUS Official Store

DSC_9367 DSC_9368

The charger was in a retail packing with a few specifications on the pack, there was no accessories included (Like manual or usb cable).

DSC_9404 DSC_9407 DSC_9411

DSC_9405

DSC_9408 DSC_9409

DSC_9410



Measurements

Baseus%202A%20USB%20XT-117%20230V%20load%20sweep

The charger can deliver slightly above 2.1A, this matches fine with the rating.

Baseus%202A%20USB%20XT-117%20120V%20load%20sweep

It is the same at 120VAC

Baseus%202A%20USB%20XT-117%20230V%20load%20test

Running 1 hour at 2.1A is no problem.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp5544
M1: 62.2C, M2: 51.9C, HS1: 70.5C
HS1 is the transformer

Temp5545
M1: 53.6C, HS1: 55.2C

Temp5546
M1: 44.6C, HS1: 71.5C
Here again HS1 is the transformer.

Temp5547
HS1: 64.0C
And here HS1 matches the synchronous rectifier.

Temp5548
M1: 57.7C, HS1: 69.1C

noohm

With no load on the charger the output voltage will jump up and down a bit

10ohm

At 0.5A the noise is 32mV rms and 750mVpp

5ohm

At 1A the noise is 49mV rms and 838mVpp.

2.5ohm

At 2A the noise is 61mV rms and 891mVpp.



Tear down

DSC_0085

A wack with my mallet and the top was loose.

DSC_0086

At the mains input is a fusible resistor partially covered with heat shrink, it has the two mains smoothing capacitors with an inductor between (Hidden in the white stuff) and there is the safety capacitor. The transformer has long secondary leads for better isolation distance.

DSC_0088 DSC_0089

There is a black isolation shield between the mains and the low volt side.

DSC_0090 DSC_0091

DSC_0087

On this side is the bridge rectifier, mains switcher (IC1: MD1812) and on the low volt side a synchronous rectifier (MD4200).

DSC_0092


DSC_0093

The safety distance is a bit on the short side, especially around the black shield, it is a bit too short.


The charger passed the 2830 volt and 4242 volt test, this means it is it is fairly safe.



Conclusion

The charger has enough current for many application, but it do not use auto coding and has a lot of noise in the output.
I am not really happy about the distance between mains and low volt, it is on the low side, but not enough to be really dangerous.




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?