SLVAFJ8 may   2023 TPS7H5001-SP

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2System Design Theory
    1. 2.1  Switching Frequency
    2. 2.2  Leading Edge Blanking
    3. 2.3  Dead Time
    4. 2.4  Enable and UVLO
    5. 2.5  Output Voltage Programing
    6. 2.6  Soft Start
    7. 2.7  Sensing Circuit
    8. 2.8  FAULT Mode
    9. 2.9  HICCUP Mode
    10. 2.10 Slope Compensation
    11. 2.11 Output Capacitance
    12. 2.12 Compensation
  6. 3Test Results
  7. 4Bill of Materials
  8. 5Schematics
  9. 6PCB Layouts
  10. 7References

2.11 Output Capacitance

The output capacitance value is picked such that there is enough capacitance for the required voltage ripple and output current load step. Equation 17 shows the calculation to find the amount of capacitance required to meet the maximum allowable voltage deviation at the output in response to a worst-case load transient. Equation 19 determines the amount of output capacitance that is needed to meet the output voltage ripple requirements of the design. Due to these calculations 20 mF was choosen for the design.

Equation 11. C O U T >   Δ I S T E P 2 π   x   Δ V O U T   x   f c = Δ   33.3   A 2 π   x   18   m V   x     15   k H z = 19.6   m F  
Equation 12. C O U T >   I O U T   x   D M A X V R I P P L E   x   f s w = 80   x   0.0667   1   m V   x   275   k H z =   19.4   m F