JAJSQV1A July 2023 – October 2023 TPS7H2140-SEP
PRODUCTION DATA
When selecting the current limit resistor we most account for the accuracy of the limit. The accuracy on the range of the desired current limit is ± 20 %.
As the current limit can be shifted up to -20%, is desired to boost the load current by this factor. In which case the load current for the calculation of the current limit is: 1.375 A.
To keep the 1.1 A nominal current in the 0 to 4 V current-sense range, calculate the RCS resistor using Equation 17. To achieve better current-sense accuracy, a 1% tolerance or better resistor is preferred.
To set the adjustable current limit value at 2.5 A, calculate RCL using Equation 18.
TI recommends RS = 10 kΩ for 5-V MCU, and RPU = 10 kΩ as the pullup resistor.