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INA293: The performance of INA293 under small current condition

user5841688
Prodigy 10 points
Part Number: INA293
Other Parts Discussed in Thread: INA193, INA240

When testing a very small current, how about the accuracy of the INA293?

As I know, when Vsense < 20mV, the acurracy of the INA193 will be very bad.

And I need to achieve a good control of a buck converter when the load is very light.

full load: 40A ,

light load: 1A ,

Rsense: 2mOhm,

Vsense: 80mV~2mV,

Peak current control

So I want to know the performance of the INA293 when Vsense is very small.

Or there are some other chips better than INA293.

  • 0
    TI__Mastermind 29710 points

    Hello User,

    The INA293 will work.  The benefit of the INA293 is the low offset, high common mode voltage range and the bandwidth.  The things to consider is the bandwidth at low Vsense as described in the.  At light load 1A * 0.002 Ω = 2mV.  Depending on your supply you can use a different gain option.  For a 5V supply I would recommend the gain of 50 option.   If you are using a 20V supply then you have the option of the gain of 100 or 200.  This also depends on what you would like your maximum output to be.

    If you are having big spikes on your VCM (Common Mode Voltage) then they device may not work but the INA240 is another option that covers that use.