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

2.3.1 Introduction

As consumer electronics like mobile phones and laptops become faster and more feature-rich, the need for fast charging speeds is also growing at an exponential rate. This trend is appended with a shift towards smaller and denser adapters with higher power density. Power densities as low as 30W/in3 are not uncommon in market today. Such high power densities are achieved by transitioning to faster switching Power FETs like GaN, which help condense the bulky magnetics needed for power conversion.

For instance, common AC-to-DC topologies in wall adapters in consumer markets is Quasi-resonant (QR) and Active-Clamp Fly-back (ACF). ACF Controllers such as TI's UCC28782 are used for generating the PWM signals needed for switching the power FETs.