Dual 2-port USB car charger UP-158-1

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Official specifications:
I got it from ebay dealer xinghaishi44

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Being from ebay there is not much packing, only the envelope and a plastic bag, there was no accessories or manual included.

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The usb connectors and the ring around them will light up with a blue light when the device is powered.




Measurements


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

The 3A output current specification is wrong, it can only deliver 1.2A and the efficiency is fairly low.

Load%20sweep%2024.0V

Using 24 volt does not improve anything, here the maximum current is down to 1.1A and the efficiency is even lower.

Voltage%20sweep%201.0A%20input%20current
Voltage%20sweep%201.0A

It can maintain output voltage down to 10V input voltage, this is fine.

No%20load%20voltage%20sweep

With no load it works it works down to 7 volt.

Load%20test%201.0A

I did only test it with 1A and it could maintain that.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp2822

M1: 42,7C, M2: 42,9C, HS1: 46,3C
Temperature is acceptable.
I had to use a rubber band to keep it in my test socket.

Temp2823

M1: 44,9C, M2: 41,2C, HS1: 46,6C

10ohm12V

At 0.5A with 12V input the noise is 41mV rms and 200mVpp, this is acceptable.

5ohm12V

At 1A with 12V input the noise is 44mV rms and 212mVpp.

10ohm

At 0.5A with 24V input the noise is 170mV rms and 720mVpp, with this higher input voltage the noise on the high side.

5ohm

At 1A with 24V input the noise is 150mV rms and 700mVpp.



Tear down

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I did not know how to open this and cut it open, but I could just have removed the front and it would be open.

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The chip used is a LC51, it do not need many support parts: Capacitor on input and output, inductor and rectifier diode.

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There is nothing on the other side.

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The two usb connectors is on a small circuit board together with two leds and resistors.

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Being a 12/24V device there is no need to test with high voltages.



Conclusion

This usb charger works, but with only 1A for two usb connectors it is very weak. The coding of the usb outputs are the same and there is no reason for the 1A/2.1A markings. It is not really good for 24V, due to the noise.


I do not see any reason to buy this car charger, the performance is simply too low for todays usb equipment.



Notes

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