An elegant idea, Paul. But the 20kHz bandwidth is lacking. A current transformer does better than that and is also isolated.
Thanks,
- Win
current monitor
Sep 27, 2016
25 Replies
I think whether 20 kHz is limiting depends on your application. Transformers tend to be rather large compared to a TO-92.
Rick C
Thanks, John, I missed seeing that. I like the serious look of the package, but I'm puzzled why they don't offer one with leads prebent for SMT. The 50A lowest FS range is an issue, with a 100mA DC offset. But I guess many apps can figure out their own specific offset.
Thanks,
- Win
Also transformers require a break in the track on the PCB.
Here's one good to 40 kHz:
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And another but only 10 kHz:
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These are probably the same sort of device as used in the transformer type:
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However that unit has 3 uSec typical response.
Paul
You can get a +/- 40A part in SMD SOIC8. It has 80kHz bandwidth
ACS723:
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Cheers
Klaus
Normally you would do a offset nulling of the current sensor during power-up or regulary, since it has an offset voltage for 0A anyway
Cheers
Klaus
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