SLLA646 August   2024 ISO6520 , ISO6521

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Where are Digital Isolators Commonly Used?
    2. 1.2 What is Functional Isolation?
    3. 1.3 Key Benefits of Functional Isolation
  5. 2Application Use Cases
    1. 2.1 Telecom Power Supplies
      1. 2.1.1 48V Isolated DC-DC
      2. 2.1.2 48V Non-Isolated DC-DC
    2. 2.2 Server Power Supply
      1. 2.2.1 Totem-Pole Power Factor Correction Stage
      2. 2.2.2 Half-Bridge LLC Stage
    3. 2.3 AC - DC Power Supply in Pluggable Wall-Chargers
      1. 2.3.1 Introduction
      2. 2.3.2 Topology Details
      3. 2.3.3 Using ISO65xx for Reliable PWM Signaling
    4. 2.4 Semiconductor Test and Measurement
  6. 3Conclusion
  7. 4References

2.3.2 Topology Details

A typical block diagram for an Active Clamp Flyback stage is as shown in Figure 2-6. The controller provides PWM signals for Power FETs (Q3 and Q4). Low-side FET (Q4) being referenced to primary ground can be provided directly from the ACF controller. However, providing PWM signal to high-side FET (Q3) can get challenging as Q3 is referenced to a high voltage switching node.

Typical Active Clamp Flyback implementation With ISO65xxFigure 2-6 Typical Active Clamp Flyback implementation With ISO65xx