Test/review of USB Wall charger 5V 2.1A US ZYBB-1516

4 posts / 0 new
Last post
HKJ
HKJ's picture
Offline
Last seen: 27 min 49 sec ago
Joined: 05/24/2011 - 12:23
Posts: 6711
Location: Copenhagen, Denmark
Test/review of USB Wall charger 5V 2.1A US ZYBB-1516

USB Wall charger 5V 2.1A US ZYBB-1516
DSC_5527
Official specifications:


  • input voltage range: 100-240V
  • input voltage frequency: 50-60Hz
  • output voltage: 5V
  • the output current: 2300mA      Charger marked as 2100mA
  • output interface: Standard USB interface
  • there is an indicator light

I got it from ebay dealer barbie_dolls_1959
DSC_5525
This charger arrived in a plastic bag inside a plastic envelope.
DSC_5528 DSC_5529 DSC_5530
DSC_5531
DSC_5532
DSC_5533
Measurements


  • Power consumption when idle is 0.12 watt
  • USB output 1 is coded as Samsung
  • USB output 2 is coded as Apple 1A
  • The two outputs are in parallel.
  • Weight: 32.7g
  • Size: 72.0 × 40.0 × 25.0 mm

USB%20Wall%20charger%205V%202.1A%20US%20ZYBB-1516%20%231%20120V%20load%20sweep
The charger cannot deliver the rated 2100/2300mA, but only about 1700mA
USB%20Wall%20charger%205V%202.1A%20US%20ZYBB-1516%20%232%20120V%20load%20sweep
The second output is the same.
USB%20Wall%20charger%205V%202.1A%20US%20ZYBB-1516%20120V%20load%20sweep
And using both outputs together do not change anything.
USB%20Wall%20charger%205V%202.1A%20US%20ZYBB-1516%20230V%20load%20sweep
With 230VAC input the charger can deliver more current, here it is up to 2200mA.
USB%20Wall%20charger%205V%202.1A%20US%20ZYBB-1516%20230V%20load%20test
For the one hour test I used 230VAC and 2.1A current, the charger could handle that.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.
Temp6668
M1: 77.7°C, HS1: 77.9°C
HS1 and M1 is the transformer.
Temp6669
HS1: 68.0°C
Temp6670
M1: 59.0°C, HS1: 83.0°C
Here HS1 is the rectifier diode.
Temp6671
HS1: 81.0°C
Temp6672
M1: 76.7°C, HS1: 80.8°C
10ohm
At 0.5A the noise is 89mV rms and 640mVpp.
5ohm
At 1A the noise is 145mV rms and 814mVpp.
2.5ohm
At 2A the noise is 193mV rms and 1825mVpp, generally the noise is rather high.
Tear down
DSC_6189
Some pressure in my vice and the lid popped open.
DSC_6190
At the mains input is a fusible resistor as fuse followed by a bridge rectifier, the main switcher IC (Hotchip HT204) is next to the opto coupler for feedback (This looks bad for isolation distances). There is a blue safety capacitor (It looks real) and a large rectifier diode.
DSC_6192
DSC_6193 DSC_6195
DSC_6194
DSC_6191
At the low volt side is the usual reference (Q01: 431) and the coding resistors for the usb outputs. The soldering do not exactly look safe.
DSC_6196
DSC_6197
It is no wonder the charger failed the high voltage tests, from the blue to the red markings must be above 6mm, there is around 1mm
The charger passed the 2830 volt test, but failed the 4242 volt test between mains and low volt side, this makes it unsafe for 230VAC countries.
Conclusion
The charger cannot deliver rated current, has lot of noise and is very unsafe. I did not see the promised indicator light.
Stay away from it.
Notes
The charger was supplied by a reader for review.
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/

qwertsun
Offline
Last seen: 1 week 1 day ago
Joined: 09/04/2018 - 12:38
Posts: 5

Like always, thank you for your review. It is always insightful and interesting to read your detailed review and analysis.

mrheosuper
Offline
Last seen: 7 hours 15 min ago
Joined: 09/30/2016 - 12:44
Posts: 1362
Location: Ho Chi Minh City, Vietnam

According to your pic, the noise at 2A is about 900mVp-p(-0.3v – 0.6v), not 1825mv, may you check again?

Forgot my pen

HKJ
HKJ's picture
Offline
Last seen: 27 min 49 sec ago
Joined: 05/24/2011 - 12:23
Posts: 6711
Location: Copenhagen, Denmark
mrheosuper wrote:
According to your pic, the noise at 2A is about 900mVp-p(-0.3v – 0.6v), not 1825mv, may you check again?

Both the rms and peak-peak values are calculated by the oscilloscope and uses multiple screens and may also use higher sensitivity than the posted screens (Not in this case).

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