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

5 Design Considerations

When designing with TI eFuses, especially in power distribution systems, discretize required operating current ranges using min and max analyses to differentiate between downstream system normal operation, shutdown mode, fault state, and open load state. Then, determine what eFuse current sense thresholds needs to correspond to each operating region and when to use OL_ON mode and ADC input scaling.

TI recommends that OL_ON mode and ADC input scaling only be used when I2T is disabled on the respective channel (I2T_EN_CHx = 0), because those settings directly modify the input voltage of the ADC and decreases the respective I2T thresholds accordingly.