SBAA666 February   2025 AMC0106M05 , AMC0106M25

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Design Challenges
  6. 3Design Approach
    1. 3.1 AMC0106Mxx Functionally Isolated Modulators
    2. 3.2 Circuit Design and Layout
    3. 3.3 Sinc3 Filter Design
  7. 4Test and Validation
    1. 4.1 Test Setup
    2. 4.2 Digital Interface
    3. 4.3 DC Accuracy, Noise, and Effective Number of Bits
    4. 4.4 PWM Rejection
      1. 4.4.1 DC Phase Current Measurement Over One PWM Cycle
      2. 4.4.2 AC Phase Current Measurement at 100kHz PWM
    5. 4.5 Bootstrap Supply Validation and AVDD Ripple Rejection Tests
      1. 4.5.1 LMG2100R044 Bootstrap Supply With Low Voltage-Ripple
      2. 4.5.2 Discrete Bootstrap Supply With High Voltage-Ripple
  8. 5Summary
  9. 6References

5 Summary

The newly released AMC0106Mxx family of functionally isolated modulators are the smallest, galvanically isolated modulators on the market today. The AMC0106Mxx come in a small, leadless package and enable high accuracy, low noise phase current sensing in a much smaller design size than what has been achievable so far. The AMC0106Mxx's high common mode voltage transient immunity, excellent power-supply rejection, digital interface to the MCU, and the inherent immunity to magnetic stray fields, make sure of accurate current measurement even during PWM switching. Supporting ambient operating temperature range up to 125°C, the AMC0106Mxx is an excellent choice for space constrained, motor-integrated, sub-60V three-phase inverter designs. Typical applications are 48V servo drives and collaborative or humanoid robots, where high performance, robust current measurement and a small form factor is important.