SNVU869 august   2023 LM5185-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 Setup
    2. 2.2 Header Information
    3. 2.3 Test Points
    4. 2.4 Assembly Instructions
    5. 2.5 Best Practices
  9. 3Implementation Results
    1. 3.1 Performance Data and Results
      1. 3.1.1 Conversion Efficiency
      2. 3.1.2 Output Voltage Regulation
      3. 3.1.3 Operating Waveforms
        1. 3.1.3.1 Start-up
        2. 3.1.3.2 Load Transient Response
        3. 3.1.3.3 Switching
    2. 3.2 Thermal Performance
  10. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layout
    3. 4.3 Bill of Materials (BOM)
  11. 5Compliance Information
    1. 5.1 Compliance and Certifications
  12. 6Additional Information
    1. 6.1 Trademarks

2.1 Setup

Figure 3-1 shows the diagram of EVM bench test setup. Refer to Section 2.2 and Section 2.3 in this user's guide for detailed information of headers, jumpers and test points. Refer to Section 2.4 for the setup assembly and test procedure. Refer to Section 2.5 for the important notice on safety concerns when handling the EVM.

GUID-20230713-SS0I-TT3S-XB84-MVVF7P7CQPWF-low.svg Figure 2-1 EVM Test Setup

The test setup consists the following instruments in addition to the EVM board.

  • Power Supply: The input dc voltage source capable of at least 0-80-V and 2 A.
  • Load: The load must be electronic constant-resistance (CR) or constant-current (CC) mode load, capable of 0 Adc to 2 Adc up to 20 V. For a no-load input current measurement, disconnect the electronic load as the load can draw a small residual current.
  • Multimeters:
    • Voltmeter 1: Input voltage at VIN+ to VIN–. Set voltmeter to an input impedance of 100 MΩ.
    • Voltmeter 2: Output voltage at VOUT+ to VOUT-. Set voltmeter to an input impedance of 100 MΩ.
    • Ammeter 1: Input current. Set ammeter to 1-second aperture time.
    • Ammeter 2: Output current. Set ammeter to 1-second aperture time
  • Oscilloscope: With the scope set to 20-MHz bandwidth and AC coupling, measure the output voltage ripple directly across an output capacitor with a short ground lead normally provided with the scope probe. Place the oscilloscope probe tip on the positive terminal of the output capacitor, holding the ground barrel of the probe through the ground lead to the negative terminal of the capacitor. TI does not recommend using a long-leaded ground connection because this can induce additional noise given a large ground loop. To measure other waveforms, adjust the oscilloscope as needed.