SLVUBV4A December   2020  – December 2021 TPS272C45

 

  1.   Trademarks
  2. 1 Introduction
  3. 2 Compatibility Across Silicon Versions
  4. 3 BoosterPack Operation
  5. 4 TPS272C45EVM Schematic
  6. 5 Connection Descriptions
  7. 6 TPS272C45EVM Assembly Drawings and Layout
  8. 7 Current Limit Configuration
  9. 8 Current Sense
  10. 9 Transient Protection
  11. 10Bill of Materials
  12. 11Revision History

8 Current Sense

The TPS272C45EVM has the ability to allow the user to sense the output current of the device through the SNS pin. This ability can be done by either:

  • Connecting an external voltmeter to test point TP7
  • Connecting an external microcontroller via the BoosterPack headers and sample/convert using the microcontroller's ADC

In the case that the microcontroller's ADC is sampling the SNS pin, it can required to populate a Zener diode on pin D7 to regulate the maximum voltage going into the microcontroller's analog input. By default a 1-kΩ resistor is used as the SNS resistor (R15), however, depending on the ADC reference used on the microcontroller it can be desired to limit the voltage by use of the Zener diode. The R15 pin's footprint is populated in a 0805 package to allow for easy soldering and desoldering.