SLUAB39 January   2026 BQ76905 , BQ76907 , BQ769142 , BQ76920 , BQ76930 , BQ76940 , BQ76942 , BQ76952 , BQ76972

 

  1.   1
  2.   Abstract
  3. 1Introduction to the low-side/high-side protection solutions
  4. 2Short-circuit protection results in overvoltage damage to DFET
    1. 2.1 Low-side protection solution
    2. 2.2 High-side protection solution
    3. 2.3 Summary
  5. 3Short-circuit protection results in overtemperature damage to DFET
    1. 3.1 Low-side protection solution
    2. 3.2 High-side protection solution
    3. 3.3 Summary
  6. 4Conclusion
  7. 5References

2.2 High-side protection solution

Figure 2-2 shows the equivalent circuit of the high-side protection solution after DFET short-circuit protection is turned off.

High-side protection solution-the discharge tube DFET shutdown equivalent circuit Figure 2-2 High-side protection solution-the discharge tube DFET shutdown equivalent circuit

Similar to the low-side protection solution, the voltage at two terminals of DS can be expressed by the following equation:

Equation 4. V D S _ H S = V L 1 + V L 2 + V b a t = L 1 d I O d t + L 2 d I O d t + V b a t