SNVSBY7 March 2021 TPS92390
The RSENSE resistor determines the boost overcurrent limit and is sensed every boost switching cycle. A high-power 20-mΩ resistor can be used for sensing the boost SW current and setting maximum current limit at 10 A (typical). RSENSE can be increased to lower this limit and can be calculated with Equation 22. In typical condition, to avoid too much efficiency loss on RSENSE resistor, boost overcurrent limit is recommended to be set above 4A, therefore RSENSE doesn't exceed 50 mΩ. Power rating can be calculated from the inductor current and sense resistor resistance value.