LM74930-Q1 has integrated short-circuit detection comparator with default sense threshold of 20 mV. For this application, short-circuit limit is set to 20 A. The sense resistor value based on short circuit comparator can be calculated by Equation 18.

Select a 1-mΩ resistor with 1% tolerance to set short-circuit protection limit of 20 A.

Selecting the lower current sense resistor value helps with lower power dissipation, however it has comparatively smaller drop across current sense resistor at full load. If higher drop across current sense resistor is desired for better current monitoring accuracy, device short-circuit limit can be increased using R_ISCP resistor. Please refer to device design calculator on LM74930-Q1 product page.