SNVU768 December   2021

 

  1.   Trademarks
  2. 1High-Density EVM Description
    1. 1.1 Typical Applications
    2. 1.2 Features and Electrical Performance
  3. 2EVM Performance Specifications
  4. 3EVM Photo
  5. 4Test Setup and Procedure
    1. 4.1 EVM Connections
    2. 4.2 EVM Setup
    3. 4.3 Test Equipment
    4. 4.4 Recommended Test Setup
      1. 4.4.1 Input Connections
      2. 4.4.2 Output Connections
    5. 4.5 Test Procedure
      1. 4.5.1 Line/Load Regulation and Efficiency
  6. 5Test Data and Performance Curves
    1. 5.1 Conversion Efficiency
    2. 5.2 Output Voltage Regulation
    3. 5.3 Operating Waveforms
      1. 5.3.1 Start-Up and Enable ON/OFF
      2. 5.3.2 Line and Load Transients
      3. 5.3.3 Short Circuit and Recovery
    4. 5.4 Thermal Performance
    5. 5.5 EMI Results – CISPR 25 Class 5
      1. 5.5.1 Conducted EMI
      2. 5.5.2 Radiated EMI
  7. 6EVM Documentation
    1. 6.1 Schematics
      1. 6.1.1 LM63460EVM-2MHZ Schematic
      2. 6.1.2 LM64460EVM-2MHZ Schematic
    2. 6.2 Bill of Materials
      1. 6.2.1 Alternative BOM Configurations
    3. 6.3 PCB Layout
    4. 6.4 Assembly Drawings
  8. 7Device and Documentation Support
    1. 7.1 Device Support
      1. 7.1.1 Development Support
        1. 7.1.1.1 Custom Design With WEBENCH® Tools
    2. 7.2 Documentation Support
      1. 7.2.1 Related Documentation

1 High-Density EVM Description

The LM63460EVM-2MHZ and LM64460EVM-2MHZ feature the LM63460-Q1 and LM64460-Q1 synchronous buck converters, respectively. The EVMs provide the full 6-A output current rating of these converters, and a wide-VIN range of 3 V to 36 V offers outsized voltage rating and operating margin to withstand automotive supply-rail voltage transients.

The selected input capacitors accommodate the entire range of input voltage and are available from multiple component vendors. Input and output voltage sense terminals and a test point header facilitate measurement of the following:

  • Efficiency and power dissipation
  • Line and load regulation
  • Load transient response
  • Enable ON/OFF
  • Bode plot (crossover frequency and phase margin)
The 8-pin header also provides connections for enable (EN), external clock synchronization (SYNC), and power-good (PGOOD) features. The recommended PCB layout maximizes thermal performance and minimizes output ripple and noise. The EVMs share a common PCB layout, whereas the BOMs have minor differences in installed components. The main differences between the ICs relate to pins 7 and 8, which are EN/SYNC and RT for the LM63460-Q1 and EN and MODE/SYNC for the LM64460-Q1, respectively.