SNOU176B October   2020  – March 2022

PRODUCTION DATA  

  1.   Trademarks
  2. 1 General TI High Voltage Evaluation User Safety Guidelines
    1. 1.1 Safety and Precautions
  3. 2 Introduction
    1. 2.1 LMG342XEVM-04X Daughter Card
      1. 2.1.1 FAULT and OC
      2. 2.1.2 Power Pins
      3. 2.1.3 Bootstrap Mode
      4. 2.1.4 Heat Sink
    2. 2.2 Mother Boards
      1. 2.2.1 Bias Supply
      2. 2.2.2 PWM Input
      3. 2.2.3 Fault Protection
    3. 2.3 Typical Applications
    4. 2.4 Features
  4. 3  LMG342XEVM-04X Schematic
  5. 4 Mother Board Schematic
  6. 5 Recommended Footprint
  7. 6 Test Equipment
  8. 7 Test Procedure When Paired With LMG342X-BB-EVM
    1. 7.1 Setup
    2. 7.2 Start-Up and Operating Procedure
    3. 7.3 Test Results
    4. 7.4 Shutdown Procedure
    5. 7.5 Additional Operating Notes
  9. 8 Test Procedure When Paired With LMG34XX-BB-EVM
    1. 8.1 Setup
      1. 8.1.1 List of Test Points
      2. 8.1.2 List of Terminals
    2. 8.2 Start-Up and Operating Procedure
    3. 8.3 Shutdown Procedure
    4. 8.4 Additional Operation Notes
  10. 9 Bill of Materials
  11. 10Revision History

8.1 Setup

The following procedure is recommended to set up the LMG34XX-BB-EVM with the LMG342XEVM-04X. The inductor on the LMG34XX-BB-EVM is capable of up to 1.7-kW operation. For a higher power level, use an external inductor.

Figure 8-1 shows the LMG342XEVM-04X connected to the LMG34XX-BB-EVM.

Note: TI provides a custom interposer board that must be used when the LMG342XEVM-04X is paired with the LMG34XX-BB-EVM. The interposer board is not needed with LMG342x-BB-EVM.
GUID-20201025-CA0I-949C-PB7S-1QQPJF5JGR7K-low.png Figure 8-1 LMG342XEVM-04X Connected to the LMG34XX-BB-EVM

Figure 8-2 shows the LMG34XX-BB-EVM power and probe connection points.

GUID-20201013-CA0I-JR4R-VFN6-ZRNXTBWPSQ9V-low.jpg Figure 8-2 Recommended Connection Points

PCB Notes:

  • A: Probe points for gate drive logic
  • B: 100-mil header for PWM input, PWM signals to LMG342XEVM-04X and FAULT output
  • C: BNC connector for PWM input
  • D: 12-V bias supply input
  • E: FAULT protection option header
  • F: Power stage high voltage input
  • G: Probe point for power stage switch node
  • H: Power stage high voltage output

To connect the LMG342XEVM-04X to the LMG34XX-BB-EVM:

  1. Connect the oscilloscope or multimeter probes to the desired test points in A or G.
  2. Connect the 12-V bias supply, connect load to output, and connect the input supply to input.
  3. Connect the function generator to either the BNC connector PWM input at C or 100-mil header connector input at pin 6 (PWM) and pin 5 (GND) at B.
  4. Connect 12-V bias supply to the fan attached on the EVM, or enable an external fan to direct airflow across the heat sink attached to the LMG342XEVM-04X.