SNOU209 December   2024

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
    5. 1.5 General TI High Voltage Evaluation User Safety Guidelines
      1. 1.5.1 Safety and Precautions
  7. 2Hardware
    1. 2.1 LMG2656EVM-102 Daughtercard
      1. 2.1.1 Test Points
      2. 2.1.2 Integrated Current Sensing
      3. 2.1.3 Enable Pin
      4. 2.1.4 GDH
      5. 2.1.5 Power Pins
      6. 2.1.6 Heat Sink
    2. 2.2 Motherboard
      1. 2.2.1 Bias Supply
      2. 2.2.2 PWM Input
      3. 2.2.3 Fault Protection
    3. 2.3 Recommended Footprint
    4. 2.4 Test Equipment
    5. 2.5 Test Procedure When Paired With LMG342X-BB-EVM
      1. 2.5.1 Setup
      2. 2.5.2 Start-Up and Operating Procedure
      3. 2.5.3 Test Results
      4. 2.5.4 Shutdown Procedure
      5. 2.5.5 Additional Operating Notes
  8. 3Hardware Design Files
    1. 3.1 LMG2656EVM-102 Schematic
    2. 3.2 Motherboard Schematic
    3. 3.3 PCB Layout
    4. 3.4 Bill of Materials
  9. 4Additional Information
    1. 4.1 Trademarks
  10. 5Related Documentation

2.5.1 Setup

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

TI recommends the following procedure to set up the LMG342X-BB-EVM with the LMG2656EVM-102:

  1. Connect the LMG2656EVM-102 to LMG342X-BB-EVM as shown in step 2; see Figure 2-5. The area for connection on the mother board is shown in Figure 2-6.
  2. Install the LMG342X-BB-EVM inside a ventilated HV safety box.
  3. Disconnect jumper J13 to enable the 12V to 5V onboard power conversion.
  4. Disconnect jumper J12.
  5. If the onboard complementary PWM generation circuits are used to generate the dead time, then connect pin 2 to pin 3 for header J7 and J14 with jumpers. Under this configuration, only one PWM signal is required and 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 connect pin 1 to pin 2 for header J7 and J14 (pin 1 of J7 and J14 are indicated in Figure 2-6). This action allows the two PWM signals to directly control the high-side and low-side devices.
  7. If fault interlock feature is desired, then 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, 100kHz, and 50% duty cycle). 5V for high input and 0V for low input.
  9. Connect the signal generator output to the LMG342X-BB-EVM PWM input as shown in Figure 2-6.
  10. Connect 12V, 2A DC power supply to the LMG342X-BB-EVM 12V bias supply as shown in Figure 2-6.
  11. Connect the high voltage power supply to the LMG342X-BB-EVM high voltage input for buck mode (high voltage) as shown in Figure 2-6.
  12. Provide 12V bias supply to fan by connecting the 3-pin power cord from fan to J15.

LMG2656EVM-102 LMG342X-BB-EVM Motherboard With LMG2656EVM-102Figure 2-5 LMG342X-BB-EVM Motherboard With LMG2656EVM-102
LMG2656EVM-102 Connector and LEDs on the LMG342X-BB-EVMFigure 2-6 Connector and LEDs on the LMG342X-BB-EVM