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Hello E2E experts,
Good day.
I have watched your video series on how to select current sense amplifiers which really helped me in understanding the basics. But there are things I'm not quite certain about. In my circuit, I want to measure a square pulsed current that varies from -30 V to 30V. Now, I'm not sure how to search your catalog of amplifiers knowing that common voltage can go from -30 V to 30V extremely rapidly (with phases being in 100s of us).
I can also add the fact that my maximum load is 15 mA if that helps you.
Regards,
CSC
Hello,
We do not currently have any current sense amplifier that operate with input common-mode less than -22V so I don't think a CSA will be practical. Unless customer wants to perform a full-wave rectification of the Vcm.
Your options are a difference amplifier with good CMRR:
https://www.ti.com/amplifier-circuit/difference/products.html#p1169max=30;275
An isolated current sensing amplifier such as the AMC1300:
https://www.ti.com/isolation/products.html#o7=Isolated%20amplifiers&sort=o1;asc
The potential third option is a hall effect sensor, but they are not accurate to measure 15mA when their full scale range is up to 20 A.
https://www.ti.com/sensors/magnetic-sensors/hall-effect-current/products.html#sort=p3265;asc
Hope this helps.
Best,
Peter