SNVU768 December   2021 LM63440-Q1 , LM63460-Q1 , LM64440-Q1 , LM64460-Q1

 

  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

4.2 EVM Setup

  • Use the VIN+ and VIN– test points along with the VOUT+ and VOUT– test points located near the power terminal blocks as voltage monitoring points where voltmeters are connected to measure the input and output voltages, respectively. Do not use these sense terminals as the input supply or output load connection points. The PCB traces connected to these sense terminals are not designed to support high currents.
  • Header J3 provides access to the following test points:
    • VIN
    • EN
    • SYNC
    • VCC
    • PGD
    • BIAS
    • VOUT
    • INJ
    The SYNC test point provides a convenient location to connect an external clock signal. The power-good (PGD) test point is available to monitor when a valid output voltage is present on the EVM. Refer to Section 4.1 for specific information related to the various test points.
Note:

The default switching frequency of the EVM is 2.1 MHz. Adjust the switching frequency by applying a clock signal at the SYNC test point. Note that lower frequency can necessitate a change in buck inductance to maintain a recommended 30% to 50% inductor peak-to-peak ripple current and optimal internal slope compensation contribution. Refer to the LM63460-Q1 or LM64460-Q1 data sheets, LM63k-LM64k Quickstart Calculator, and WEBENCH® Power Designer for additional guidance related to converter operation and component selection..