goobay 43747 usb 1A

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Official specifications:
I bought it from av-connection.dk, being from inside EU it is supposed to be safe according to EU specifications.

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This charger arrived in a retail package.

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Measurements


goobay%2043747%20usb%201A%20load%20sweep

Output voltage is very stable, the charger has overload protection at 1.2A. This looks good.

goobay%2043747%20usb%201A%20load%20test

There is no problem supplying 1A for one hour.
The temperature photos below are taken between 30 minutes and 60 minutes into the 1 hour test.

Temp1924

M1: 43,8C, M2: 58,5C, M3: 42,2C, HS1: 74,0C
HS1 is the mains transformer.

Temp1925

M1: 60,5C, M2: 60,8C, M3: 41,9C, HS1: 62,3C
HS1 must be the rectifier diode.

Temp1926

M1: 63,3C, M2: 63,2C, M3: 42,2C, HS1: 64,4C
HS1 must be the switcher transistor, M2 the trasformer and M1 the rectifier diode.

Temp1927

M1: 41,0C, M2: 56,0C, HS1: 63,9C

Temp1929

M1: 42,5C, M2: 54,3C, HS1: 71,2C


10ohm

There is some noise at 0.5A with 19mV rms and 420mVpp.

5ohm

It does not really change with increased load, 22mV rms and 400mVpp at 1A.



Tear down

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As usual some pressure pops it open.

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This charger do not use a fuse, but instead a resistor. It has a main switcher transistor besides the transformer.

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The wires from the transformer goes to the low voltage side, this helps keeping a good distance between mains and low voltage.

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There is a bridge rectifier and a mains switcher IC. The rectifier diode is D3.

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With the slots only 4 mm distance is needed, there is more here (Very good).


Testing the mains input with 2500 volt and 5000 volt between mains and low volt side, did not show any safety problems.



Conclusion

This charger has fairly good performance and is safe.
It is interesting to compare it to Apple and cheap Chinese copies and see difference in constrution.



Notes

See: Apple Cheap Chinese copy
Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger