Ansmann 2.4A High Speed USB car charger 1000-0014

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Official specifications:
I got it from Ansmann

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I got this charger in a partly transparent plastic box, it only contained the charger.

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Measurements


Load%20sweep%2011.6V
Load%20sweep%2014.6V

The usb outputs works fine at both high and low battery voltage and has a overload protection at about 2.75A

Load%20sweep%2024.0V

It is about the same at 24V input.

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The charger needs a few mA for idle current.

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The normal usb output needs a bit above 1A at 12V to supply 2.4A on usb output.

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And the output will be stable down to 9 volt input.

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There was no problem running 1 hour with full load. The tick at 46 minutes is my handling it while taking IR photos.

The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp4704

M1: 49,9C, HS1: 61,1C

10ohm

The noise at 0.5A is 18mV rms and 97mVpp

5ohm

The noise at 1A is 17mV rms and 94mVpp

2ohm

The noise at 2.5A is 22mV rms and 118mVpp, all very low values.



Tear down

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The lid was not easy to remove, I had to cut it off.

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With a bit more work I got the circuit board out.

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Nothing surprising here, a input and output capacitor and a inductor.

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Both capacitors are rated 105C this means they can take a lot of heat.

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On this side there is a input fuse (F1), a buck converter (U1: C2103A), a rectifier diode (D1: SS54) and a auto coding chip (U2: M5887).
There is also a zener diode (Z1), accross the usb output voltage.

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Being a 12V device there is no need to test with high voltages.



Conclusion

A single port charger with auto coding, low noise and overload protection, this looks like a good car charger.



Notes

The usb charger was supplied by Ansmann for a review.

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