Mean Well GS05E-USB

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Official specifications:
I got it from tme.eu

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I got this charger in a blister pack.

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Measurements


Mean%20Well%20GS05E-USB%20load%20sweep

Output voltage do drop with load, but stays within usb tolerances. The overload protection kick in at 1.1A, this is very nice for a 1A charger.

Mean%20Well%20GS05E-USB%20load%20test

There where no problems running for on hour at 1A load.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp2391

M1: 48,8C, M2: 60,5C, HS1: 64,1C
HS1 is the rectifier diode and M2 is the transformer.

Temp2392

M1: 58,3C, M2: 56,3C, HS1: 63,0C
HS1 is the rectifier diode and M2 the transformer.

Temp2393

M1: 59,2C, M2: 55,0C, M3: 48,2C, HS1: 60,1C
HS1 is the mains switcher transistor.

Temp2394

HS1: 47,9C

Temp2395

M1: 43,9C, HS1: 71,7C
The rectifier diode heats the usb connector.

10ohm

Fairly good output: 14mV rms and 430mVpp

5ohm

Noise stay fairly constant with load: 16mV rms and 440mVpp



Tear down

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The vice could not open this power supply, but some supplement with a mallet got it open.

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This adapter uses separate circuit boards, one for mains and one for low voltage side.
The brown box below the green MOV is a fuse.Q1 is the switcher transistor. There is also an inductor at the input.
The circuit board has markings for a safety capacitor (CY1), but it is not mounted.

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On the other side is the bridge rectifier (BD1), the switcher controller (U1) and on the small circuit board the rectifier diode (D3).

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One one side the inductor can be seen (Green with 3 brown and one silver ring), from the other side the switcher transistor (Wrapped in yellow tape), the fuse and the MOV can be seen.

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The ridge in the plastic is an important safety feature, it is used to imcrease the clearance distance between the mains circuit board and the low volt circuit board.


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



Conclusion

This is a small usb power supply with good safety. The noise is a bit high, but it will usual be acceptable.



Notes

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