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INA223: Vout voltage calculation

Part Number: INA223

Hi Team,

Please kindly help to confirm the Vout calculation and sch.

Our setting as below pic.

And the calculation as below:

Rsense=0.001 Ohm , current at 278W/12V=23.167A
Vsense=1m Ohm x 23.167A = 0.023167V
INA223 Vout =(DC IN) *(Vsense)*(POWERgain)
INA223 Vout =12V*0.023167*10=2.78004V


Given INA223 Vout from above we must divide the voltage down to meet the IMVP8 Psys full scale input voltage of 2V
R0704=1.96K and R0706=4.99K gives a full scale Psys voltage of 2V.

Thanks

  • Hi,

    I assume 278W is the peak power. The shunt voltage gain of 300 might be a little too high considering the supply is 2.2V. Because 24mV*300=7.2V. The explanation is done by the datasheet here:

     

    Consequently, I would choose shunt voltage gain of 128; and bus voltage gain of 0.2 (0.1 is OK also as you did). Then the power output voltage would be 12V*24*8.533=2.46V.

    Regards, Guang