SNVU768 December   2021 LM63460-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

4.5.1 Line/Load Regulation and Efficiency

  • Set up the EVM as described in Section 4.
  • Set load to constant resistance or constant current mode to sink 0 A.
  • Increase the input source voltage from 0 V to 13.5 V; use voltmeter 1 to measure the input voltage.
  • Increase the current limit of the input supply to 6 A.
  • Use voltmeter 2 to measure the output voltage, VOUT, and vary the load current from 0 A to 6 A DC; VOUT should remain within the load regulation specification. For optimal accuracy, measure the output voltage at the output capacitors close to the converter.
  • Set the load current to 3 A (50% rated load) and vary the input source voltage from 6 V to 24 V; VOUT should remain within the line regulation specification.
  • Set the load current to 6 A (100% rated load) and measure the efficiency at typical input voltages (8 V, 12 V, 13.5 V, and 18 V cover the automotive battery voltage range).
  • Decrease the load to 0 A. Decrease the input source voltage to 0 V.
CAUTION:

Extended operation at high output current can raise component temperatures above 55°C. To avoid risk of a burn injury, do not touch the components until they have cooled sufficiently after disconnecting power.