Tutuo USB Smart Charger QC-025PT

DSC_8791

Official specifications: I got it from gearbest


DSC_8784

I got it in a brown cardboard box, with only the brand name and a barcode on it.

DSC_8786

The box contained the charger, mains cable, a usb cable and instruction sheet.

DSC_8792

DSC_8794

DSC_8793 DSC_8795

Beside the "3.0" label on top is a blue and red led, The blue part is connected to 5V and the red part is connected to QC and will show some red at 9V and more at 12V.

DSC_8796 DSC_8797



Measurements

Tutuo%20USB%20Smart%20Charger%20QC-025PT%20%232%20230V%20load%20sweep

No obvious current limit on this port.

Tutuo%20USB%20Smart%20Charger%20QC-025PT%20%23234%20230V%20load%20sweep

Using all ports in parallel I can draw 10A and without individual port protection this is also what can be drawn from a single port.

Tutuo%20USB%20Smart%20Charger%20QC-025PT%20%23234%20120V%20load%20sweep

And about the same at 120VAC

Tutuo%20USB%20Smart%20Charger%20QC-025PT%20QC5V%20230V%20load%20sweep

The QC output has a current limit at 3.7A at 5V

Tutuo%20USB%20Smart%20Charger%20QC-025PT%20QC9V%20230V%20load%20sweep

At 9V it drops at 2.7A

Tutuo%20USB%20Smart%20Charger%20QC-025PT%20QC12V%20230V%20load%20sweep

At 12V it is down to 1.8A, this is well above the rated 1.5A

Tutuo%20USB%20Smart%20Charger%20QC-025PT%20C%20230V%20load%20sweep

The usb-c output can deliver 3.8A

Tutuo%20USB%20Smart%20Charger%20QC-025PT%20230V%20load%20test

Running the charger with 2.4A on usb, 3A on usb-c and 1.5A on QC 12V worked fine.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp5559

M1: 54.7C, M2: 55.7C, HS1: 62.0C
HS1 is the transformer and M2 is part of the rectifier heatsink.

Temp5560

M1: 51.4C, HS1: 54.3C

Temp5561

M1: 56.7C, M2: 56.5C, HS1: 57.7C
M2 is the transformer and M1 is the rectifier heatsink.

Temp5562

M1: 46.5C, HS1: 50.8C

Temp5563

M1: 61.7C, HS1: 65.5C

10ohm

At 0.5A the noise is 10mV rms and 268mVpp.

5ohm

At 1A the noise is 10mV rms and 257mVpp.

2ohm

At 2.5A the noise is 10mV rms and 238mVpp.

1ohm

At 5A the noise is 10mV rms and 172mVpp.

10ohmC5V

At 0.5A the noise is 14mV rms and 275mVpp.

2ohmC5V

At 2.5A the noise is 6mV rms and 86mVpp.

10ohmQC5V

At 0.5A the noise is 6mV rms and 170mVpp.

2ohmQC5V

At 2.5A the noise is 14mV rms and 266mVpp.

10ohmQC9V

At 0.9A the noise is 11mV rms and 271mVpp.

10ohmQC12V

At 1.2A the noise is 9mV rms and 303mVpp.


Tear down

DSC_0795

I could pry the lid of with a screwdriver, the circuit board was mounted with two screws (There was space for four).

DSC_0797

At the mains input is a fuse and a common mode coil, the mains switcher transistor is mounted on a heatsink. On each side of the the transformer there is a safety capacitor (Only one is visible).
On the low volt side is a heatsink with a diode for QC and a rectifier transistor for 5V (Both QC and USB), there is also opto feedback from the 5V rail.
The QC circuit has a inductor (L2) and a buck controller (U8?) with a rectifier diode (D5), the QC protocol is handled by a small 8 pin IC (U14?). The Power supply for QC is 5V + 9V from an extra winding on the transformer.
Next to the usb-c connector is a led in a shrink wrap tube.

DSC_0806

The usb-c connector has its own circuit board with a chip on it (U6: UC2501), not to implement the PD protocol, but to make it auto coding for old-style usb power and provide over current limit.

DSC_0798 DSC_0799

DSC_0800 DSC_0801

DSC_0796

This side has a lot more chips on it and the mains bridge rectifier (BR1), the mains switcher is U1. It looks like R5 was supposed to be two resistors on top of each other, but the topmost one got loose due to heat (May have been during my test). The two black pieces are to improve mains isolation.
On the low volt side is a synchronous rectifier chip (U12) that controls the transistor on the heatsink, the voltage reference (U7: 431). Each of the regular usb connectors has a auto code chip (U2, U3, U5), there is also a regular fuse for each usb output (F4, F5, F6).
A Zener diode (D7: around 6.3V) and resistor (R76) is used for the red led.

DSC_0802

DSC_0804

The distance between mains and low voltage is fine.


Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.



Conclusion

The charger can deliver a lot of power and has output for the most common standards: USB, QC, USB-C.
The USB-C is not a PD with multiple voltage and electronic reporting, but just 5V. All ports has auto coding for the usual usb protocols. All ports shares a common power source and there is not enough to run all ports at there rated current, even though there is a lot of power. The noise is on the low side.
I do not like the fuses, the will protect against damaged usb cables, but it means that the usb port is permanently dead. The misplaced resistor is also very bad, I did run the charger a bit hard, but I would not expect parts to come loose.

I will rate is as fairly good.



Notes

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