SBAU473A January   2025  – February 2025 AMC1200 , AMC1200-Q1 , AMC1202 , AMC1300 , AMC1300B-Q1 , AMC1301 , AMC1301-Q1 , AMC1302 , AMC1302-Q1 , AMC1400 , AMC1400-Q1 , AMC21C12 , AMC22C11 , AMC22C11-Q1 , AMC22C12 , AMC22C12-Q1 , AMC23C10 , AMC23C11 , AMC23C12 , AMC23C12-Q1 , AMC23C14 , AMC23C15 , AMC23C15-Q1 , AMC3301 , AMC3301-Q1 , AMC3302 , AMC3302-Q1

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 Hardware Overview
    2. 2.2 Assembly Instructions
    3. 2.3 Interfaces
      1. 2.3.1 Analog Input
      2. 2.3.2 Isolated Amplifier (AMC3302) Analog Output
      3. 2.3.3 Isolated Comparator (AMC23C15) Analog Output
    4. 2.4 Power Requirements
      1. 2.4.1 VDD2 Input
    5. 2.5 Test Points
    6. 2.6 Lug Information
  9. 3What to Do and What Not to Do
  10. 4Implementation Results
    1. 4.1 Evaluation Procedure
      1. 4.1.1 Equipment Setup
      2. 4.1.2 Test Procedure
      3. 4.1.3 Full Signal Chain Evaluation Procedure
    2. 4.2 Performance Data and Results
      1. 4.2.1 Shunt Selection Calculations
      2. 4.2.2 Filter Selection
      3. 4.2.3 Thermal Results
  11. 5Hardware Design Files
    1. 5.1 Schematics
    2. 5.2 PCB Layouts
    3. 5.3 Bill of Materials (BOM)
  12. 6Additional Information
    1. 6.1 Trademarks
  13. 7Compliance Information
    1. 7.1 Compliance and Certifications
  14. 8Related Documentation
  15. 9Revision History

2.3.1 Analog Input

AMC-AMP-50A-EVM AMC-AMP-50A-EVM Analog InputFigure 2-2 AMC-AMP-50A-EVM Analog Input

Figure 2-2 shows the analog input circuit for the AMC-AMP-50A-EVM.

The input is supplied through the high current input lugs at J4(+)/IN+ and J5(-)/IN-. The input current is sensed through shunt resistor R18 and carried into the analog inputs of the AMC3302 and into the analog input of the AMC23C15. R17 is unpopulated by default configuration. The AMC3302 input is accessible to the user through test-points INP and INN. The AMC23C15 input is accessible to the user through test-points IN and REF.

For the AMC3302 input, the passive components R5, R8, and C14 make a differential anti-aliasing filter with a cutoff frequency of 497kHz. Ferrite beads FB1, FB2, and FB3 help to suppress high frequency signals on the signal lines. See the Best Practices to Attenuate AMC3302 Family Radiated Emissions EMI application note for more information. Capacitors C3, C4, C5, C12, and C13 serve as decoupling capacitors.

For the AMC23C15 input, the passive components R16 and C23 make an RC filter with a cutoff frequency of 1.59GHz. Passive components R20 and C24 define the adjustable threshold voltage determined by the desired overcurrent value. See the AMC23C15 data sheet for more details. Capacitors C19 and C20 serve as decoupling capacitors.