SNVU863 july   2023

 

  1.   1
  2.   Description
  3.   3
  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.     General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
    2. 2.1 Test Points
      1. 2.1.1 Key Connections
        1. 2.1.1.1 Connect a Supply to J3 Connector
        2. 2.1.1.2 PWM Input
        3. 2.1.1.3 J1 Connector: Power Supply
    3. 2.2 Power-Up Procedure
      1. 2.2.1 Step 1: Driver Bias Supply
      2. 2.2.2 Step 2: Input Supply
      3. 2.2.3 Step 3: Measure SW Voltage
      4. 2.2.4 Setting Dead-Time
    4. 2.3 Power-Down Procedure
    5. 2.4 Assembly Guidelines
  9. 3Implementation Results
    1. 3.1 Electrical Performance Specifications
      1. 3.1.1 Evaluation Setup
      2. 3.1.2 Performance Data and Results
  10. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layouts
    3. 4.3 Bill of Materials
  11. 5Additional Information
    1. 5.1 Trademarks

2.2.3 Step 3: Measure SW Voltage

To observe the SW node, connect a probe with a small pigtail to the via next to the SW pin, as shown in Measuring the SW Node. This verifies that the measurement loop is small and, hence, accurately reflects the behavior of the SW node. If a large loop is used, due to the high dv/dt on the SW node and the parasitic impedance (inductance) of the loop, then a large amount of ringing is observed on the SW node measurements. This ringing is not representative of the device performance, but is rather a measurement artifact. The probe connection must be made prior to the board being powered up and one must verify that appropriate safety precautions are taken.

Connect the scope probe to measure the SW node as shown in Figure 3-2. Notice the small pigtail used to minimize the ground loop.

GUID-20230525-SS0I-JDMF-BPXV-HBJT2DQR0NZF-low.jpg Figure 2-2 Measuring the SW Node