SLVSE17A May 2019 – April 2020 TPS1HB16-Q1
The SNS output may be used to sense the load current if the SEL1 pin is low and there is no fault or device temperature if the SEL1 pin is high and there is no fault. The sense circuit will provide a current that is proportional to the selected parameter. This current will be sourced into an external resistor to create a voltage that is proportional to the selected parameter. This voltage may be measured by an ADC or comparator. In addition, the SNS pin can be used to measure the FET temperature.
To ensure accurate sensing measurement, the sensing resistor should be connected to the same ground potential as the μC ADC.
|Load current||ISNSI = IOUT / KSNS = IOUT / 3000|
|Device temperature||ISNST = (TJ – 25°C) × dISNST / dT + 0.85|
The SNS output will also be used to indicate system faults. ISNS will go to the predefined level, ISNSFH, when there is a fault. ISNSFH, dISNST/dT, and KSNS are defined in the Specifications section.