Test/review of LDNIO Dual usb charger A2202

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HKJ
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Location: Copenhagen, Denmark
Test/review of LDNIO Dual usb charger A2202

LDNIO Dual usb charger A2202
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Official specifications:


  • Input:100-240V, 50-60Hz
  • Output: 5V/2.4A
  • Quick & short circuit / overtemperature / overvoltage / overcurrent protection;

I bought it from Aliexpress dealer Worthit Store
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I got it in a card board box, it only contained the charger, no manual or usb cable.
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Measurements


  • Power consumption when idle is 0.13 watt
  • Both usb output are auto coding with Apple 2.4A as max.
  • Outputs are in parallel.
  • Weight: 40.2g
  • Size: 80.1 × 42.5 × 23.2mm

LDNIO%20Dual%20usb%20charger%20A2202%20top%20230V%20load%20sweep
Overload protection at about 2.6A is fine for a 2.4A charger, it also has a nice high output voltage (This will probably vary between different copies of the charger).
LDNIO%20Dual%20usb%20charger%20A2202%20bottom%20230V%20load%20sweep
The other usb connector is the same.
LDNIO%20Dual%20usb%20charger%20A2202%20120V%20load%20sweep
And running them in parallel is also the same, the charger can only supply 1×2.4A, not 2.4A on each port.
LDNIO%20Dual%20usb%20charger%20A2202%20230V%20load%20sweep
Both 120VAC and 230VAC works the same.
LDNIO%20Dual%20usb%20charger%20A2202%20230V%20load%20test
No problems running one hour at 1A.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.
Temp4097
M1: 68,5°C, HS1: 80,2°C
HS1 is the switcher IC heating the circuit board.
Temp4098
M1: 56,1°C, M2: 61,4°C, HS1: 72,0°C
HS1 is the switcher IC.
Temp4099
M1: 59,2°C, HS1: 66,8°C
HS1 is the transformer.
Temp4100
M1: 50,1°C, HS1: 69,1°C
HS1 is one of the rectifier diodes.
Temp4101
M1: 78,5°C, HS1: 92,4°C
10ohm
At 0.5A the noise is 35mV rms and 723mVpp.
5ohm
At 1A the noise is 35mV rms and 688mVpp.
2ohm
At 2.5A the noise is 55mV rms and 860mVpp, this is rather high.
Tear down
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Some pressure from my vice and the two lids popped open (A spudger may have done it).
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On this side of the circuit board is a fuse at the L mains entry, a safety capacitor, a switcher IC (U1) and two rectifier diodes (D4 & D5). There is also a led between the usb connectors.
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From this side the switcher IS and one of the switcher diodes can be seen.
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This is the side with mains input, the fuse is packed into shrink wrap.
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The fuse, the safety capacitor and one of the rectifier diodes.
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The led between the usb connectors.
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This side has the bridge rectifier (DB1) and the auto coding chip (U2).
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Safety distance is a bit on the low side at about 4.5mm, this is too low for 230VAC, but perfectly acceptable at 120VAC
Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.
Conclusion
The auto coding is a good detail, but with two outputs the 2.4A is a bit on the low side, I could also have wished for less noise. The slightly low safety distance do also mean it is slightly dangerous to use on 230VAC.
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/