UK A1299

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Official specifications:
I got it from Ebay dealer vivaxu

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No retail package for this charger, I got it in a envelope.

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With the large plug size UK uses, the charger fits inside it.


Measurements



UK%20A1299%20load%20sweep

These adapters are often rated at 1A, but on my copy it is not possible to read the rating and the test shows that it can only supply 0.4A.
The circuit does not have any overload protection.

UK%20A1299%20load%20test

It could supply 0.4A for one hour, but the voltage was a bit low.

Temp1652

M1: 32,1C, M2: 30,9C, HS1: 35,4C
With this low output current the temperature is fairly moderate.

Temp1653

M1: 31,4C, HS1: 42,1C

Temp1654

M1: 38,4C, M2: 33,0C, HS1: 43,7C

Temp1655

HS1: 35,3C

14ohm

The noise is not moderate, but very bad. At 0.35A I got 190mV rms and 1.2Vpp.

unloaded

Even without any load, there is a lot of noise: 86mV rms and 1.2Vpp



Tear down

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A simple design on the mains input with only one diode and a capacitor, no fuses or filters.

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The isolation is rather bad it is supposed to be over 6 mm on the circuit board, but here it is only 1mm


The charger failed a isolation test with 2500 volt, this makes it doubtful to use with 120VAC mains. The fail made a shorted between mains and low voltage side (Very bad)!



Conclusion

Low output current, lots of noise and bad isolation (I will rate the isolation dead trap).

Stay away from this one!



Notes

Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger