SLVAG06 March   2025 TPS40210 , TPS40210-Q1 , TPS40211 , TPS40211-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Primary Side Regulation (PSR)
  6. 3Secondary Side Regulation Implementation
    1. 3.1 Common Implementation Feedback for Secondary Side Regulation
    2. 3.2 Implementing Feedback for Secondary Side Regulation
  7. 4Simulation Results
  8. 5Practical Bode Plot Comparison
  9. 6Summary
  10. 7References

5 Practical Bode Plot Comparison

Figure 5-1 and Figure 5-2 show the experiment results with and without the primary internal amplifier based on the PMP40274 board parameters. For the compensator without the amplifier, the change is the same as the simulation model. Loop bode plot without amplifier has a bandwidth of 7.6kHz, a phase margin of 58°C and a gain margin of -18dB. The loop bode plot with the amplifier has a bandwidth of 3.2kHz, a phase margin of 58°C and a gain margin of -17dB. Only the bandwidth is slightly different, however, each bode plot has good phase margin and gain margin.

Loop Bode Plot without Amplifier Figure 5-1 Loop Bode Plot without Amplifier
Loop Bode Plot with Amplifier Figure 5-2 Loop Bode Plot with Amplifier