Ansmann 1.2A High Speed USB charger ANB0214
Official specifications:
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Input: 100-240V 60/50Hz
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DC Output: 5V 1.2A
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Size: 64 × 35 × 19 mm
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Weight: 26g
I got it from Ansmann
I got it in a plastic box.
The box contained the charger and some safety instructions.
Measurements
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Power consumption when idle is 0.04 watt
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Usb output is coded as usb charger (DCP)
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Weight is 24.2 grams.
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Size is 64.4 x 35.5 x 14.3mm
At 120VAC it can deliver 1.7A before the overload protection kick in.
And slightly less at 230VAC.
And the charger can deliver 1.2A for one hour.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.
M1: 66,9°C, HS1: 78,8°C
HS1 is the transformer and M1 is the rectifier diode.
M1: 44,2°C, M2: 53,2°C, HS1: 55,6°C
HS1 is the transfoermer and M2 is the rectifier diode again.
HS1: 72,5°C
HS1: 63,9°C
M1: 45,9°C, HS1: 78,0°C
At 0.5A the noise is 26mV rms and 803mVpp.
At 1A the noise is 26mV rms and 670mVpp.
Tear down
Using the vice to apply pressure on the sides popped it open.
Notice the shields in the plastic, they isolate the transformer from the usb connector.
At the mains input is a fuse or fusible resistor and a inductor wrapped in heatshrink.
From this side the inductor can be seen.
The fuse is between the two mains input terminales.
The transformer uses flying output wires to get better isolation distance.
At the input is the bridge rectifier (DB1), the mains switcher (U1: LNK6417D 8.5 watt switcher) has a bit of the circuit board as heatsink. On the low volt side is the rectifier diode (D3).
Creepage distance is above 6mm.
Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.
Conclusion
This switcher can deliver the rated current, the usb coding matches that and has good safety. The internal design looks very nice in its simplicity, but the noise is a bit high.
Notes
The usb charger was supplied by Ansmann for a review.
Read more about how I test USB power supplies/charger