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

Abstract

Flyback is the common isolated topology to simplify a design. There are a few methods for stabilizing feedback. Use primary side regulation if tight regulation output is not required or an optocoupler is not available. Using a TL431 device because TL431 and optocoupler both applied in isolated feedback is a method for isolated feedback on the secondary side. There is need compensation for stable loop commonly implemented in the secondary side. Theoretically, using a selected internal error amplifier is not required. Using this method requires more consideration. These design tips are crucial to enable the system to function.