Test/review of Xiaomi Mi 65W USB-C charger CDQ07ZM

1 post / 0 new
HKJ
HKJ's picture
Offline
Last seen: 23 hours 43 min ago
Joined: 05/24/2011 - 12:23
Posts: 7425
Location: Copenhagen, Denmark
Test/review of Xiaomi Mi 65W USB-C charger CDQ07ZM

Xiaomi Mi 65W USB-C charger CDQ07ZM
DSC_1746
Official specifications:


  • Name: xiaomi USB-C charger 65W
  • Model number: CDQ07ZM
  • port: USB-C
  • Input: 100-240V – 50/60HZ 1.8A
  • Output: 5.0V- 3.0A / 9.0V- 3.0A / 12.0V- 3.0A / 15.0V- 3.0A / 20.0V- 3.25A
  • Size: 60*57*28mm

I got it from aliexpress dealer: Dtop Store
DSC_1680 DSC_1681 DSC_1682 DSC_1683
I got it in a cardboard box with specifications on the back.
DSC_1743
The box contained the charger, a usb cable and a instruction sheet in Chinese
DSC_1747 DSC_1748 DSC_1749 DSC_1750
DSC_1754 DSC_1751
DSC_1753 DSC_1752
DSC_1755
The supplied cable can handle 3.25A with USB-C
Measurements


  • Power consumption when idle is 0.08 watt
  • PD output supports: 5V 3A, 9V 3A, 12V 3A, 15V 3A, 20V 3A, 20V 3.25A
  • PD output also support DCP and QC3
  • Default PD output is off.
  • Weight: 115g
  • Size: 61.3 × 57 × 28mm with legs folded

Xiaomi%20Mi%2065W%20USB-C%20charger%20CDQ07ZM%20PD5V%20230V%20load%20sweep
At 5V the overload protection is at about 3.1A, this is very good for a 3A rating.
Xiaomi%20Mi%2065W%20USB-C%20charger%20CDQ07ZM%20PD9V%20230V%20load%20sweep
It is the same at 9V
Xiaomi%20Mi%2065W%20USB-C%20charger%20CDQ07ZM%20PD12V%20230V%20load%20sweep
And 12V
Xiaomi%20Mi%2065W%20USB-C%20charger%20CDQ07ZM%20PD15V%20230V%20load%20sweep
15V is also 3.1A
Xiaomi%20Mi%2065W%20USB-C%20charger%20CDQ07ZM%20PD20V%20230V%20load%20sweep
And 20V is also 3.1A. Oops something is wrong, the charger is rated for 3.25A at this voltage. The reason is the cable, it is raporting 3A as max current.
Xiaomi%20Mi%2065W%20USB-C%20charger%20CDQ07ZM%20PD20Va%20230V%20load%20sweep
With a 5A cable the current limit is moved to about 3.3A. I was a bit impressed that it not only change the electronic report, but also change current limit depending on cable.
Xiaomi%20Mi%2065W%20USB-C%20charger%20CDQ07ZM%20PD20Va%20230V%20load%20test
For a load test I used 20V 3.25A for one hour, it worked fine.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.
Temp5986
M1: 61.3°C, HS1: 62.9°C
Temp5987
M1: 62.7°C, M2: 64.4°C, HS1: 67.1°C
HS1 is the transformer.
Temp5988
M1: 69.6°C, M2: 52.0°C, HS1: 70.7°C
Again HS1 is the transformer and M1 is the rectifier transistor.
Temp5989
M1: 63.7°C, HS1: 72.0°C
Here HS1 must be the output transistor
Temp5990
M1: 59.7°C, HS1: 67.1°C

10ohmPD5V
At PD 5V 0.5A the noise is 23mV rms and 300mVpp.
5ohmPD5V
At PD 5V 1A the noise is 12mV rms and 238mVpp.
2ohmPD5V
At PD 5V 2.5A the noise is 11mV rms and 233mVpp.
10ohmPD12V
At PD 12V 1.2A the noise is 18mV rms and 304mVpp.
10ohmPD20V
At PD 20V 2A the noise is 33mV rms and 414mVpp, all noise values are fairly low.
Tear down
DSC_2302
I did not believe I could break it open and went directly to cutting.
DSC_2303 DSC_2304
The circuit is hidden in shielding, bit top and bottom.
DSC_2305
A bit of soldering and breaking and I had removed the shields.
DSC_2306 DSC_2307
At the mains inpu is a fuse (F1) followed by a common mode coil (LF1) and a bridge rectifier (BD1). Near the bridge is also a blue safety capacitor. On the other side of the USB-C connector is the PD controller (U4: WT6632F S65). The chip behind the usb connector must be a output transistor to enable/disable usb output.
DSC_2309 DSC_2310
DSC_2311 DSC_2312
DSC_2308
The mains switch transistor (Q1) did have a pad on it for heat transfer to the metal shield, next to the transistor is the switch controller (U1) and the opto feedback (U2).
On the low volt side is a synchronous rectifier controller (U3: Marked ACDDB) and the rectifier transistor (Q3)
I wonder what U5, Q6 and Q7 do.
DSC_2313
DSC_2314
The distance between mains and low volt side is good.
The charger passed the 2830 volt and 4242 volt test, this means it is it is fairly safe.
Conclusion
This is a good PD charger and it can also be used for devices that do not know the PD protocol, but uses QC instead.
With slightly above 3A it can also be used to check if cables allows more than 3A, it is not always marked on the cable.
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?

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/