SU100 unbranded usb charger

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I have tested this size of charger before and it was not very good. This model here is upgraded with two usb connectors and more output current. How much does this upgrade improve it?

Official specifications:



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No retail package for this charger, only a simple plastic bag.

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Not much design in this adapter, it is just a box with a power plug and a couple of usb socket.



Measurements


SU100%20120VAC%20load%20sweep

The power supply is supposed to be a 3A supply, but it can only deliver 0.6A at 120VAC, this is not very impressive.

SU100%20230VAC%20load%20sweep

Using it with 230VAC it can deliver nearly 1A, still way below specifications and I did not see any overload protection.

SU100%20120VAC%20load%20test

One hour with 0.6A load works fine.

Temp1516

M1: 35,8C, HS1: 47,2C
It gets warm, but it is acceptable.

Temp1517

M1: 35,7C, M2: 38,5C, HS1: 43,3C

SU100%20230VAC%20load%20test

With 230VAC and 0.9A load it also works fine.

Temp1521

M1: 42,3C, HS1: 61,3C

But it do get considerable warmer.



Tear down

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The charger is very compact constructed and I cannot see any isolating elements in it.

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The two leds are color cycling leds, i.e. they will continuous change color when the adapter is powered.

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The two red circles shows how close mains and low voltage side is to each other, I will estimate about 0.5mm, this is way to low for both US and EU safety.

The charger failed a isolation test with 2500 volt, this makes it doubtful to use on mains power anywhere in the world.



Conclusion

This charger has considerable less performance than rated, but that is only a minor issue compared to the bad safety.
With this type of charger there is a risk of making the headlines.

I.e. stay away from it.



Notes

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