4 port QC3 USB charger SLS-B07

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Official specifications: I got it from a reader, I do not know where it was bought.

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It arrived in a envelope.

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Measurements

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A single port can deliver about 2.8A

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The same on another port.

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And not very surprisingly the same when all ports are used together.

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Using 120VAC do not change anything.

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The QC output can deliver about 3.75A before output really start dropping, but it is on the low side at around 2.2A.

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The 9V looks better, here it can deliver about 2.75A

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And the 12V QC output can deliver about 2.1A

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But only 1.5A with 120VAC supply.

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Loading it with rated current, or a bit less on 5V it could only maintain output for 9 minutes.

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Reducing both a bit did help, here I could run for about 23minutes.

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With 2.2A on 5V and 1A on QC 12V I succeeded in running the one hour test.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp7538

M1: 80.7C, HS1: 84.3C

Temp7539

HS1: 82.8C

Temp7540

HS1: 89.4C

Temp7541

HS1: 64.7C

Temp7542

M1: 55.9C, M2: 69.4C

10ohm

At 0.5A the noise is 105mV rms and 836mVpp.

5ohm

At 1A the noise is 253mV rms and 1541mVpp.

2ohm

At 2.5A the noise is 159mV rms and 761mVpp.

10ohmQC5V

At 0.5A the noise is 58mV rms and 635mVpp.

2ohmQC5V

At 2.5A the noise is 125mV rms and 1103mVpp.

10ohmQC9V

At 9V 0.9A the noise is 104mV rms and 944mVpp.

10ohmQC12V

At 12V 1.2A the noise is 137mV rms and 1165mVpp. There is a lot of noise on the outputs.



Tear down

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Some pressure with my vice and a knock with my mallet and it was open.

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On this side is one switcher chip (U1), one opto feedback, two transformers and two fake safety capacitor (? & CY2: 1nF 1kV).
There is two leds between the USB connectors.

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On this side is the bridge rectifier (BD1) and the other switcher (U5: TD217), on the low volt side is a synchronous rectifier for 5V (U6: DP4110) and a dual charge optimiser (U7: HC2802). For QC there is also a synchronous rectifier (U8) and a QC controller (U4: HC6602) and a reference (U3: 431).

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The connection for the fake safety capacitor runs along the edge of the circuit board up into the mains area, this means the creepage distance is less than a mm.


Testing with 2830 volt and 4242 volt between mains and low volt side failed for both. This makes the charger unsafe anywhere in the world.



Conclusion


With fake safety capacitor and very low distance between mains and low volt side there is only one thing to say:

STAY AWAY



Notes

The USB charger was supplied by a reader for review.

Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger
How does a usb charger work?