OLAF 5V 2A SUB Fast Charger JC-0060

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Official specifications: I got it from ebay dealer nctqkj2-2017

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This cheap charger arrived in a plastic bag in a plastic envelope without any accessories.

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Measurements

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The charger can deliver slightly above 3A, that is a bit much for a 2A charger.

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It delivers slightly less at 120VAC, but still way above specifications.

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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.

Temp6247

M1: 65.0C, M2: 46.9C, HS1: 68.3C
HS1 is probably a combination of the transformer and the rectifier diode.

Temp6248

M1: 60.7C, HS1: 64.2C

Temp6249

HS1: 76.2C

Temp6250

M1: 58.8C, HS1: 73.5C
HS1 is probably the circuit board near the rectifier diode.

Temp6251

M1: 65.6C, HS1: 70.0C
The high temperature around the USB connector is probably from the rectifier diode.

10ohm

At 0.5A the noise is 57mV rms and 397mVpp.

5ohm

At 1A the noise is 93mV rms and 640mVpp.

2ohm

At 2.5A the noise is 131mV rms and 971mVpp, this is on the high side.



Tear down

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Some pressure on the enclosure with my vice and the bottom could be broken off.

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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.

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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.

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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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