SDAA080 September   2025 TPS2HCS08-Q1 , TPS2HCS10-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2High Side Switch Current Sense and Open Load Detection
    1. 2.1 Current Sense in High-side Switches
    2. 2.2 Open-Load Detection in High-side Switches
  6. 3Smart eFuse Current Sense and Open Load Detection
    1. 3.1 Open Load Detection in eFuses
    2. 3.2 Open-Load Current Sense Scaling
    3. 3.3 ADC Input Scaling
    4. 3.4 OL_ON and ADC Input Scaling Programming Procedure
  7. 4Normal vs. Open-Load Scaling Test Results
  8. 5Design Considerations
  9. 6Summary
  10. 7References

Abstract

Texas Instruments' (TI) automotive smart eFuses, such as TPS2HCS08-Q1, feature a very high current sense accuracy that enables precise I2T protection, load diagnostics, and power calculations. However, as current sense accuracy decreases proportionally to load current, a high peak current sense accuracy alone is not enough to distinguish between different load states. For example, such as if the load circuitry is intentionally shut off versus if the load is disconnected due to an open load fault. To enhance diagnostic performance at low currents, automotive smart eFuse devices provide a number of features to improve current sense accuracy at lower currents, including open-load scaling and ADC scaling. This application note introduces those features and provides a design reference with test methodology and results showcasing how to use them in designs.