5V 1A USB Port Car Charger JHY008

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Official specifications: I got it from ebay dealer: katcam

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Measurements

Load%20sweep%2011.6V

The output can deliver nearly 0.6A, but not the rated 1A.

Load%20sweep%2014.6V

Higher input voltage increases the output current slightly.

Load%20sweep%2024.0V

At 24V it turns the output off when overloaded.

Voltage%20sweep%200.5A%20input%20current

Voltage%20sweep%200.5A

The charger needs about 10V to maintain 0.5A output current, this is very bad.

No%20load%20voltage%20sweep

Power consumptions varies with voltage, but it fairly low.

Load%20test%200.5A

I did this test at 0.5A and the charger could handle that.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp6841

M1: 38.5C, HS1: 58.3C

Temp6842

M1: 46.4C, HS1: 57.6C

10ohm

Noise at 0.5A output is 13mV rms and 175mVpp




Tear down

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I just removed the front and the back to open it, but it looks like the idea was to remove the sticker and unscrew the small screw.

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A simple design with a switcher IC (U1: SP84064), a inductor (L1) and a rectifier (D1). The LED is directly connected to the IC.
It looks like the chip is designed for car chargers and the USB coding is directly from the chip.

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There is one unused pin on the chip and it is not even soldered.

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Conclusion

This charger is way to weak for modern equipment with only 0.5A output current, but it works fairly well as a 0.5A car charger.




Notes

The charger was supplied by a reader for review.

Read more about how I test USB power supplies/charger
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