SLVUCM2A january   2023  – july 2023 TPSF12C3 , TPSF12C3-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 Specifications
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 EVM Description
    2. 2.2 Setup
      1. 2.2.1 High-Voltage Testing
      2. 2.2.2 EVM Connections
      3. 2.2.3 Low-Voltage Testing
    3. 2.3 Header Information
    4. 2.4 EVM Performance Validation
    5. 2.5 AEF Design Flow
      1. 2.5.1 AEF Circuit Optimization and Debug
  9. 3Implementation Results
    1. 3.1 EMI Performance
    2. 3.2 Insertion Loss
    3. 3.3 Surge Immunity
    4. 3.4 SENSE and INJ Voltages
  10. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 Bill of Materials
    3. 4.3 PCB Layout
      1. 4.3.1 Assembly Drawings
      2. 4.3.2 Multi-Layer Stackup
  11. 5Compliance Information
    1. 5.1 Compliance and Certifications
  12. 6Additional Information
    1.     Trademarks
  13. 7Related Documentation
    1. 7.1 Supplemental Content
  14. 8Revision History

2.2 Setup

Figure 3-3 shows a typical EMI measurement setup. A line impedance stabilization network (LISN) in series with each supply line and an EMI receiver provide a measurement of the total EMI that includes DM and CM propagation components. Appropriate addition or subtraction of the total noise measurement from each LISN, designated as V1, V2, V3 and V4 in Figure 3-3, enables an examination of CM and DM noise signatures, respectively.

GUID-20230722-SS0I-SQB3-1HMK-8QW5PF1VD8NL-low.svg Figure 2-1 EMI Measurement Setup for a Three-Phase System

The AC/DC regulator has internal high-dv/dt switching nodes that can capacitively couple CM noise to the chassis. As such, verifying the Y-capactiors in the EMI filter are closely referenced to the chassis is imperative, as illustrated in Figure 3-3. The Y-capacitors can then return the CM noise current back to the noise source in a tight conduction loop. Otherwise, the noise current can flow in the reference ground plane back to the LISNs, rendering the EMI filter less effective.