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INA303: Alert Thresholds: RLIMIT x ILIMIT not to exceed (VS – 0.6 V)?

AnBer
Mastermind 29370 points
Part Number: INA303

Team,

Just to be sure we understand correctly the NOTE at page page 19 section 7.3.3.1.1 of INA303 SBOS775C datasheet:
https://www.ti.com/product/INA303?keyMatch=INA303&tisearch=search-everything&usecase=GPN#tech-docs

It means that the supply VS must be at least 0.6V higher than the voltage drop of RLIMIT x ILIMIT.
Can you please confirm this?

So for most application you can not use a VS below 5V.

It would make sense to have a warning generated in the EXCEL document is this case occurs:
https://www.ti.com/product/INA303?keyMatch=INA303&tisearch=search-everything&usecase=GPN#design-development##design-tools-simulation
Current Sense Amplifier Comparison and Error Tool (Rev. B)

Thanks in advance!

A.

  • 0
    TI__Mastermind 29240 points

    Hello A.

    You are correct in the VS must be at least 0.6V higher than Rlimit x Ilimit.  Most of the time this value is also limited by the analog portion of the circuit as well but not as bad as it can normally go upto Swing High on the analog output.  Increasing Rsense is one way of dealing with this issue.

    The Current Sense Amplifier Comparison and Error Tool is more designed for the error comparisons for all the current sense amplifiers and is not targeted at only the Current Sense Amplifiers with comparator.  There is currently no input for this Rlimit in the tool you mentioned.