SNOU206 October   2024 LMG2640

 

  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 LMG2640EVM-090 Daughter Card
      1. 2.1.1 Test Points
      2. 2.1.2 Integrated Current Sensing
      3. 2.1.3 Enable Pin
      4. 2.1.4 FAULT
      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 LMG2640EVM-090 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

2.5.2 Start-Up and Operating Procedure

  1. Turn on +12VDC to the LMG342X-BB-EVM. Watch the power supply for the DC current to settle down after approximately 3 to 5 seconds.
  2. Make sure all the fault LEDs are off and the 5V LED is on.
  3. Turn on +12VDC to enable the fan.
  4. Turn on the function generator to output the continuous pulse, and check the dead time of the PWM signals.
  5. User proper probes for measurement. To measure the fast switching transient in the switch-node, TI recommends to use the high-bandwidth high-voltage passive probes with minimized ground loop connections.
  6. TI recommends to add common-mode chokes to the measurement signals and to the power input and output connections.
  7. Enable the high voltage power supply and make sure to ramp the voltage up gradually from 0V to the desired bus voltage (up to 480V). As the voltage is ramping up, the HV LED turns on and become brighter.
LMG2640EVM-090 Switch-Node Voltage Measurement with High-Bandwidth Probe and Pigtail Ground Connection Figure 2-6 Switch-Node Voltage Measurement with High-Bandwidth Probe and Pigtail Ground Connection
WARNING: Do NOT turn on the device at the absolute maximum voltage. TI recommends to start the device at or below 480 V. Slowly increase the input voltage and monitor the VSW to make sure the peak voltage does not exceed the absolute maximum rating of 650 V.