Baseus 2A USB XT-117



Official specifications:

• Brand Name: BASEUS
• Quality Certification: CE,RoHS,FCC,CCC
• Output Interface: USB
• Power Source: A.C. Source
• USB Ports: 1
• Support Quick Charge Technology: No
• Output: 5V/2.1A
• Model Number: Baseus USB Charger (EU)
• Style: EU USB Charger
• Material: Fireproof PC + ABS

I got it from aliexpress dealer: BASEUS Official Store



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











Measurements

• Power consumption when idle is 0.07 watt
• Usb coding is Apple 2.1A
• Weight: 33g
• Size: 72.9 x 36 x 21.2mm

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



It is the same at 120VAC



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.


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


M1: 53.6°C, HS1: 55.2°C


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


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


M1: 57.7°C, HS1: 69.1°C



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



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



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



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



Tear down



A wack with my mallet and the top was loose.



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.



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





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






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?