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INA250: schematic review request

Kevin Lai
Intellectual 2916 points
Part Number: INA250


Hi team,

I have a customer planning to use the INA250 for current sensing across 4 different switchers.

the schematic is equivalent in all cases, but the INA250 family selected is different.

can you please help to review the schematic and let me know your feedback?

switcher 1: 

Vin = 12V, Vout = 4.7V, Iout = 0.88A

INA250A4 selected. 

switcher 2:

Vin = 12V, Vout = 20.7V, Iout = 2A

INA250A3 selected.

switcher 3:

Vin = 12V, Vout = 5.5V, Iout = 1.23A

INA250A4 selected.

switcher 4:

Vin = 12V, Vout = 3.8V, Iout = 3.8A to 4A.

INA250A2 selected. 

Thanks,

Kevin 

  • 0
    TI__Mastermind 26335 points

    Hello Kevin,

    Thanks for reaching out on the forum.  So if I interpret what you have correctly, the INA250 monitoring switcher 1 should output 1.76V per Iout, the INA250 monitoring switcher 2 should output 1.6V per Iout, the INA250 monitoring switcher 3 should output 2.46V per Iout, and the INA250 monitoring switcher 4 should output 2V per Iout.  These values all fall well within the swing of the device (50mV to 3.1V).  If Vout corresponds to the common mode seen by the INA250s, then these also are within the INA250 recommended range.  Therefore I do not see an issue with the schematic you have provided.