SLVAF11 June   2021 TPS51397A , TPS566231 , TPS566235 , TPS566238 , TPS568230

 

  1.   Trademarks
  2. 1Introduction
  3. 2Open Loop Frequency Response of D-CAP2 and D-CAP3 Converter
  4. 3Method to Choose LC Value for Loop Stability
    1. 3.1 Limits of Output Capacitance
    2. 3.2 Phase Margin Estimation Method
  5. 4Example of LC Design Method for D-CAP3 Converter
  6. 5Simulation and Experimental Verification
  7. 6Summary
  8. 7References
  9. 8Appendix A

5 Simulation and Experimental Verification

The example in Section 4 is verified by Simplis simulation first. As shown from Figure 5-1 that the crossover frequency is 75.9kHz and the phase margin is 55 degree with chosen components. That accords with the theoretical estimated results 77kHz and 57.7 degree and it’s proven that phase margin is enough with the proposed application design method.

GUID-20210128-CA0I-G9HM-PKBT-CBRHWMC5PZVJ-low.gif Figure 5-1 Bode Plot from Simplis Simulation

The experiment result is shown in Figure 5-2. The crossover frequency and phase margin are 82.99kHz and 52.2 degree respectively, which are close to the theoretical analysis and also prove the effectiveness of proposed application design method for stability.

GUID-20210220-CA0I-ZXHK-DXHS-BDFFBW6NJVMG-low.gif Figure 5-2 Bode Plot from Experimental Verification