Test/Review of LDNIO DL-AC52 Dual usb 2.4A

1 post / 0 new
HKJ
HKJ's picture
Offline
Last seen: 1 day 23 hours ago
Joined: 05/24/2011 - 12:23
Posts: 7423
Location: Copenhagen, Denmark
Test/Review of LDNIO DL-AC52 Dual usb 2.4A
LDNIO DL-AC52 Dual usb 2.4A

DSC_9526

Official specifications:
  • Input: 100-240V AC,50/60Hz
  • Output: DC 5V 2.4A
  • Weight: 50g
  • Compatible: USB 2.0 Power Plug.

I bought it from banggood.com, this is not a super cheap model, but cost a bit more. Is this enough to make it safe?

DSC_9489 DSC_9490 DSC_9492 DSC_9493

This charger arrived in a retail package.

DSC_9527 DSC_9528 DSC_9792

DSC_9529

DSC_9525

DSC_9530

The two ports are marked "For iOS" and "For android" with some small and nearly invisible letters



Measurements
  • Power consumption when unloaded: 0.16 Watt
  • iOS output is coded as Apple 2.5A
  • Android output is coded as usb charger (DCP).
  • USB connectors has a hidden blue led between them.
  • Outputs are in parallel.


LDNIO%20DL-AC52%20Dual%20usb%202.4A%20iOS%20load%20sweep
LDNIO%20DL-AC52%20Dual%20usb%202.4A%20Android%20load%20sweep

The two ports are the sam and have very stable output voltage and the efficiency is around 80%, the charger has overload protection at 2.5A. This looks good.

LDNIO%20DL-AC52%20Dual%20usb%202.4A%20iOS%20load%20test

One hour with 2.4A load is not problem.
The temperature photos below are taken between 30 minutes and 60 minutes into the 1 hour test.

Temp1895

M1: 51,4°C, M2: 51,3°C, HS1: 64,7°C
HS1 is probably the rectifier diode on the heatsink.

Temp1896

M1: 52,6°C, M2: 43,6°C, HS1: 70,9°C
HS1 is probably the transformer.

Temp1897

M1: 52,4°C, M2: 42,5°C, M3: 32,4°C, HS1: 69,6°C
HS1 is probably the transformer.

Temp1898

M1: 62,5°C, HS1: 72,7°C

Temp1899

M1: 49,2°C, HS1: 54,9°C


10ohm

There is some noise at 0.5A with 23mV rms and 520mVpp.

5ohm

It increases with load, 45mV rms and 700mVpp at 1A.

2ohm

The peak has increased even more, 38mV rms and 810mVpp at 2.5A.



Tear down

DSC_9884

Some pressure on the golden band and I could break it open.

DSC_9885

It looks very compact, but it do have a couple of good details: There is a fuse, the switcher transistor is fairly large and the rectifier has a heatsink.

DSC_9887 DSC_9888

Here the rectifier heatsink can be seen, it is a piece of circuit board. Between the two usb connectors the blue led can be seen.
The capacitor marked Y1 is the safety capacitor.

DSC_9889 DSC_9890

The safety capacitor is easier to see here and the 105°C capacitors. At the mains input the fuse can be seen (F1).

DSC_9886 DSC_9891

On the bottom is the bridge recitifer and the mains switcher controller IC (U1).
This model does not use opto feedback, but as can be seen on the load sweep it does fine without.

DSC_9892

The safety is always interesting with a compact construction. When using slots in the circuit board the distance for air can be used, i.e. 4 mm, but here there is only 3mm. There is a couple of other places where there also might be problems.



Testing the mains input with 2500 volt and 5000 volt between mains and low volt side, did not show any safety problems.



Conclusion

There performance of this usb power supply is good and the safety is much better than the cheaps ones, but not good enough.



Notes


Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger

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

Edited by: sb56637 on 06/25/2015 - 11:50