Web W12-A2A

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Official specifications: I got it from aliexpress dealer: Great vendor

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The charger arrive in a cardboard box, that was more than big enough for this device.

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There is a led on each side of the USB connector on the end marked "WEB-" at the top.



Measurements

Test with Blitzwold BW-S9 usb charger

This charger can deliver slightly above 20W before the output voltage drops at 12V.

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There is cable compensation.

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Comparing these curves to the ones below shows that the QC charger limits the power, not this device.



Test with power supply

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At 5V the output is limited to about 3.6A and there is some cable compensation. Efficiency is above 90% most of the time. The output current goes up to 5A before the voltage drops.

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At 9V the maximum current is about 4.5A and there is also cable compensation here and even better efficiency.

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At 12V the current is limited to 4.5A and the cable compensation do not work, due to the limited input voltage.

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The device shuts down slightly above 10V input.

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When 12V output is selected it will drop some before the device shuts down.

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The input current is fairly constant until the device shuts down.

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There was no problem running 1 hour with 3A load at 12V.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp6640

HS1: 45.4C
Being a aluminium enclosure the outside has nearly constant temperature all around.

Temp6642

HS1: 46.0C

Temp6641

HS1: 48.8C

10ohm

At 0.5A the noise is 7mV rms and 100mVpp.

5ohm

At 1A the noise is 4mV rms and 98mVpp.

2ohm

At 2.5A the noise is 9mV rms and 92mVpp.

10ohmQC9V

At 0.5A the noise is 11mV rms and 78mVpp.

10ohmQC12V

At 0.5A the noise is 3mV rms and 103mVpp, all very low noise values.



Tear down

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Four small screws at each end and the box was open.

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The circuit board has more specifications than I have seen elsewhere, but this side do not have any parts.

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All electronic is here, the main chip is a USB PD controller (IP6518) it supports: DCP/QC2.0/QC3.0/PE+1.1/PE2.0/FCP/AFC/SFCP/SCP/USB PD and is also the switching regulator. The PD function is obvious not used here.
There is also a 3 pin voltage regulator (5333B) and a unknown chip, probably a microprocessor to handle QC on the input. At the output is two leds, one of them dual color.

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Conclusion

This device can secure that any Quick Charger will support just about any fast charge protocol. I do not know how useful this is, normally I would prefer to get a charger with native support for the fast charge protocol that is needed.
It can also be used after a 12V power supply to provide USB power, again with all charge protocols supported.

The device works fine and with good efficiency, but the current limit is rather high.



Notes

Review of Blitzwold BW-S9 usb charger

Read more about how I test USB power supplies/charger
Compare car chargers and other DC supplied chargers