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

1 Introduction

There are two methods to stabilize feedback.

This article summarizes the implementation method of PSR and SSR, and shows how to consider feedback compensation parameter settings to achieve stable bias IC and good transient response on the primary side regulation. On the secondary side regulation, there are two ways to implement feedback. It is not necessary to use the primary side IC internal error amplifier because of the error amplifier and compensator on the secondary side. Use the internal error amplifier of the primary control device. Make sure the internal error amplifier is the operation amplifier instead of the transconductance amplifier. Consider the optocoupler output connection and setting the gain of the internal error amplifier. Both methods can achieve a stable loop.

Performing a simulation on the PMP40274 board verified these two methods.