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

7.3 Test Results

In this test example, a synchronous buck converter operation is implemented. The input voltage is 400 V, and the output voltage is 200 V with 50% duty cycle. With the heatsink-version EVM, the inductor current goes to 20 A in this test, and an output power of 4 kW is achieved. The waveform for continuous operation is shown in Figure 7-4 . The slew rate is set to 85 V/ns by connecting 20 kohm between Rdrv and ground. From this waveform, a turn-on voltage slew rate of 85 V/ns is observed at 400 V/20 A switching conditions.

The turn-on slew-rate of the device can be easily adjusted from 30V/ns to 150V/ns by changing the Rdrv resistor values. This is also verified from the test results shown in Figure 7-7. The adjustable slew-rate feature provides a flexibility to adapt the device's switching speed in different applications.

Figure 7-4 85 V/ns at 400 V/20 A
Figure 7-5 100 V/ns at 400 V/20 A
Figure 7-6 30 V/ns at 400 V/20 A
Figure 7-7 150 V/ns at 400 V/5 A