Hi all,
I'm developing the board which used DRV8245. I have some questions about IPROPI usage and equation.
I've read this [How to configure IPROPI and current sensing] but still not sure and need to recheck my understanding.
7.5.8 IPROPI & ITRIP Regulation
For HTSSOP package, It said that [A_IPROPI is 6150 A/A]. Is it means that the Output current at IPROPI pin of ICs is equal to the current sensed at internal High-side FET divided by 6150 in Amp.
Then, To make IPROPI be readable by ADC, it's up to suitable Rsense. For instance,
If Motor current is in range [0, 10]A / 12-bit ADC in range[0, 3.3]V.,
Vout to ADC = Ipropi x Rs
3.3 = (10/6150) x Rs
>> Rs (implement into the board) is about 2KΩ.
Then, to calculate read value from ADC back to Motor's current (I_motor), uses this equation:
MotCurVolt = [(ADC_raw / 4096) x 3.3]
I_motor = [MotCurVolt / 2000(Ω)] x 6150
Is my understand correct?
