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October 20, 2010
about 4 years ago
Check the datasheet because that’s normal. See the FAQ but due to the internal noise the smallest amount the ACS712 can measure is between 100ma and 500ma depending on your bandwidth. You might want to think about a current sense amplifier instead.
about 6 years ago
For those of you having the shorting issue, I resolved this by moving the EN pin from OUT to IN.
1) Desolder and lift the left side of the LM2623. I slid a thin wire under all four pads and gently pulled as I heated the whole row of pins.
2) Cut the trace under the LM2623 that goes from Pin2 to Pin7.
3) Resolder the left row of LM2623.
4) TEST to make sure there are no shorts.
5) Gently solder a thin wire (like wire-wrap wire) between Pin2 and Vin. I soldered directly to the Jumper.
4) TEST again to make sure there are no shorts (there were for me).
That’s all. It works fine now, draws far less power on startup, and handles temporary shorts without issue. Next, I’ll probably remove the jumper, solder the IN directly to the jumper hole and use the IN pad to expose the EN pin so I can control power remotely.
As an aside, this board is pretty crappy. Really bad ripple and the designer didn’t leave enough physical room for a larger output capacitor if you want to fix the ripple. The NCP1400 board is a far more stable supply.
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