Ikea Koppla USB 5V 2A 404.122.78

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Official specifications: I got it from Ikea Denmark.

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It is in a plastic box.

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The box contained the charger and a manual.

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Being from Ikea, the manual is in many languages.

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Measurements

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The charger can deliver slightly above 2.3A, this is fine for a 2A rated charger.

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Running it at 120VAC do not change anything.

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And the charger has no problem delivering rated current for one hour.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp6663

M1: 44.2C, HS1: 47.3C

Temp6664

HS1: 47.2C
HS1: The hot corner is the rectifier transistor

Temp6665

HS1: 48.5C
Here HS1 is the white glue between the transformer and the enclosure.

Temp6666

HS1: 45.1C
Again HS1 is the transformer.

Temp6667

M1: 46.2C, M2: 39.4C, HS1: 46.8C

10ohm

At 0.5A the noise is 17mV rms and 556mVpp.

5ohm

At 1A the noise is 24mV rms and 560mVpp.

2.5ohm

At 2A the noise is 19mV rms and 307mVpp.



Tear down

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I could not break the charger open before I had cut a bit. The circuit board sits nicely in the charger.

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And here it is out of it.

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The white raiser goes through the slot in the circuit board and provides very good isolation.

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At the mains input is a fuse (F1) and a safety capacitor. After the fuse is the inrush current limiter (NTC1) and transient protection (470V MOV). Between the two smoothing capacitors (EC1 & ?) is a inductor (L1). Next to the transformer (T1) is the switching transistor (Q1).

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On this side is the bridge rectifier (BD1), the mains switcher controller (U1: RAH9503). On the low volt side is a synchronous rectification transistor (Q3) with a controller IC (U2: Probably marked 665V) and a charge optimizer IC (U3: Marked 30021).

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The creepage distance is large enough.


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



Conclusion

This charger looks safe and has a fair amount of power, but using a Apple 2.4A coding for a 2A charger is not ideal, 2.1A had been better.



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?