SBOA618 December   2025 TMCS1126

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Current Ratings and Thermal
    1. 2.1 Current Ratings
    2. 2.2 Effects of PCB and Layout
  6. 3Accuracy
  7. 4Bandwidth, Response Time and Propagation Delay
    1. 4.1 Bandwidth
    2. 4.2 Response Time
    3. 4.3 Propagation Delay
  8. 5Lightning and Surge
    1. 5.1 Knowing Lighting and SPD in Solar
    2. 5.2 Understanding IEC 61643-32
    3. 5.3 Understanding IEC 61643-11
    4. 5.4 Surge Requirements in Solar Systems
    5. 5.5 Challenges and Designs for In-Package Hall Sensor
  9. 6Isolation and Reliability
  10. 7Summary
  11. 8References

4.2 Response Time

The definition of response time (Tr) of hall sensor is the period between the input current reaching 90% of the final value and the output voltage reaching 90% of the final value, for an input current step sufficient to cause a 1V change in the output voltage, as shown in Figure 4-2.

Transient Step ResponseFigure 4-2 Transient Step Response

In severe short circuit conditions, the slew rate of the current can be very high, so the response time for the current sensor is critical to trigger the short circuit current protection value.

TI's in-package hall-effect current sensor offers the advantage of implementing over-current protection is the dedicated /OC pin which can be used to trigger short circuit protection with only 100ns (typical) delay.