4 Port Rapid Cigarette USB Car Charger With 5V 6.8A
I got it from ebay dealer: smile_cc
- DC Input: 12-24V
- DC output: 5V/6.8A
- Product Size: 66.54*37.84*32.4mm
- Power consumption when idle is 3.7mA from 12V and 2.4mA from 24V
- All USB outputs is coded as Apple 2.4A
- All USB outputs are in parallel.
- There is a blue led behind at the front.
- Weight: 27.3g
- Length: 72mm
- Front: 32.4 x 38mm
A USB output can deliver more than 4A, this means no individual port protection.
Running all port in parallel the maximum output current is around 7.6A with a nearly flat car battery.
The same is true for a full car battery.
But the output current is lower when using 24V
With a total of 3.5A load it works down to about 5.5V.
The unloaded input current is fairly low.
I did this test at 6.8A and the charger could handle that.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.
M1: 50.4°C, HS1: 72.9°C
M1: 50.8°C, HS1: 70.4°C
Noise at 0.5A output is 6mV rms and 76mVpp
Noise at 0.5A output is 7mV rms and 92mVpp
Noise at 0.5A output is 5mV rms and 55mVpp
A bit pressure on the sides and the front popped loose.
On this side is the inductor, the current ability of the tail input spring is reinforced with a wire.
At the input is a fuse (R1), there is a synchronous switcher IC (U1: GS92A3). The chip is rated for 3V to 28V, this is bit low for 24V car systems, the chip can deliver 8A output.
There is a auto coding chip, but my tester did not detect it. This circuit board also makes it possible to make specific codings with resistors.
This charger is fairly good, especially for a cheap charger, with low output noise and lots of current, but the auto coding is not working correctly and there is no individual port protection. I would not recommend using it on a 24V system.
The charger was supplied by a reader for review.
Read more about how I test USB power supplies/charger
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