I have a question about your company's charge / discharge IC (TI_BQ24171).
The following formula is used to calculate the charge current.
Ichareg = (Viset) ÷ (20 × Rsr)
What does the coefficient “20” used above mean?
Also, could you tell me the maximum and minimum value of coefficient “20”?
How much error is there?
Please tell me how much there is a charge current error.
Hi,
The 20 V/V is the gain of the differential amplifier that measures the voltage across the sense resistor at the SRN and SRP pins. We don't separately specify the accuracy of the this gain factor or the KISET = 5 A/V for the ISET resistor divider. We specify the total accuracy relative to voltage across the sense resistor. Below is the excerpt from datasheet page 7:
Regards,
Jeff
