OLAF 5V 2A SUB Fast Charger JC-0060
Official specifications:
- AC ADAPTER usb charger adapter
- Input: 100-240V~50/60Hz Max0.5A
- Output: 5.0V-2.0A iphone charger
- Type: Power Adapter
- Compatible Devices: Universal
- Special Functions : Portable,USB,Rapid Charging
- Color: Black&white
I got it from ebay dealer nctqkj2-2017
This cheap charger arrived in a plastic bag in a plastic envelope without any accessories.
Measurements
- Power consumption when idle is 0.11 watt
- USB outputs is coded with usb charger (DCP)
- Weight: 35.1g
- Size: 83 x 40 x 22.5mm
The charger can deliver slightly above 3A, that is a bit much for a 2A charger.
It delivers slightly less at 120VAC, but still way above specifications.
Running the charger with 2A total output worked, but the output voltage drops when the charger gets warm.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.
M1: 65.0°C, M2: 46.9°C, HS1: 68.3°C
HS1 is probably a combination of the transformer and the rectifier diode.
M1: 60.7°C, HS1: 64.2°C
HS1: 76.2°C
M1: 58.8°C, HS1: 73.5°C
HS1 is probably the circuit board near the rectifier diode.
M1: 65.6°C, HS1: 70.0°C
The high temperature around the USB connector is probably from the rectifier diode.
At 0.5A the noise is 57mV rms and 397mVpp.
At 1A the noise is 93mV rms and 640mVpp.
At 2.5A the noise is 131mV rms and 971mVpp, this is on the high side.
Tear down
Some pressure on the enclosure with my vice and the bottom could be broken off.
At the input is a fusible resistor (FU) and a bridge rectifier, the switcher is (DK1203: 12Watt), opto coubler, a large rectifier diode and a zener diode (DW). The blue safety capacitor have some approval markings on it.
The zener diode is used instead of a 431 chip, but is not nearly as good, this also explains the output voltage drop when the charger gets warm.
There is no interesting parts on this side. One of the output tracks is a bit interesting in layout, it goes from the rectifier diode to the capacitor, then to the output terminal, this is obvious done to reduce the output ripple a bit.
Distance between mains and low volt side is slightly low at about 5.5mm
Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.
Conclusion
This charger is half decent, it can deliver rated current (and more), but is rather noise. Safety is not perfect, but not directly dangerous either.
Notes
The charger was supplied by a reader for review.
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