SLOA285A October   2019  – October 2020 ISO7741 , ISOW7841 , LM25037 , LM25180 , LM5180 , LM5181 , LM5181-Q1 , UCC12040 , UCC12050

 

  1.   Trademarks
  2. 1Introduction
  3. 2Flyback Topology
  4. 3Primary Side Regulated (PSR) Flyback Topology
  5. 4Open-Loop Push-Pull Topology
  6. 5Closed Loop Push-Pull Topology
  7. 6Integrated Isolated Power Solution
  8. 7Isolated Power and Data Into Single Device
  9. 8Summary
  10. 9Revision History

5 Closed Loop Push-Pull Topology

Meeting output voltage regulation requirements can be challenging due to the absence of closed loop feedback in open-loop Push pull topology. For higher power levels and tighter output regulation, closed-loop push-pull topology can also be used. Similar to a conventional Flyback, this topology needs an isolated feedback using opto-coupler. An example schematic for such topology using LM25037 is shown in Figure 5-1. Though the power level is approximately 5W here, the overall component count and size is huge compared to open-loop push-pull topology using SN6505.

GUID-EDB4B889-A11E-43DF-9024-6E6A5B6D5710-low.gifFigure 5-1 Closed Loop Push-Pull Topology Using LM25037