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

7.1 Setup

The inductor on LMG342X-BB-EVM is capable of around 3-kW operation. For higher power levels, use an external inductor.

TI recommends the following procedure to set up the LMG342X-BB-EVM with the LMG342XEVM-04X:

  1. Connect the LMG342XEVM-04X to LMG342X-BB-EVM as shown in Figure 7-1. The area for connection on the mother board is shown in Figure 7-2.
  2. Install the LMG342X-BB-EVM inside a ventilated HV safety box.
  3. Disconnect jumper J13 to enable the 12-V to 5-V onboard power conversion.
  4. Disconnect jumper J12.
  5. If the onboard complementary PWM generation circuits are used to generate the dead time, please connect Pin 2 to Pin 3 for header J7 and J14 with jumpers. Under this configuration, only one PWM signal is required and it can be connected to either J3 or J8.
  6. If two complementary PWM signals with dead time are provided to J3 (high-side PWM) and J8 (low-side PWM), then please connect Pin 1 to Pin 2 for header J7 and J14 (Pin1 of J7 and J14 are indicated in Figure 7-2). This action allows the two PWM signals to directly control the high-side and low-side devices.
  7. If fault interlock feature is desired, please connect jumper J10 and J11. Otherwise, disconnect them and the PWM signals can always pass through to the devices.
  8. Set the signal generator to a desired frequency and duty cycle (that is, 100 kHz, and 50% duty cycle). 5 V for high input and 0 V for low input.
  9. Connect the signal generator output to the LMG342X-BB-EVM PWM input as shown in Figure 7-2.
  10. Connect 12-V, 2-A DC power supply to the LMG342X-BB-EVM 12-V bias supply as shown in Figure 7-2.
  11. Connect the high voltage power supply to the LMG342X-BB-EVM high voltage input for buck mode (High Voltage) as shown in Figure 7-2.
  12. Provide 12-V bias supply to fan by connecting the 3-pin power cord from fan to J15.
GUID-20201024-CA0I-GJ4Z-1KP6-9X24PLWSQHQF-low.pngFigure 7-1 LMG342X-BB-EVM Motherboard With LMG342XEVM-04X
Figure 7-2 Connector and LEDs on the LMG342X-BB-EVM