TIDUF28 November   2023

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Highlighted Products
      1. 2.2.1 LMG3422R030
      2. 2.2.2 ISO7741
      3. 2.2.3 AMC1306M05
      4. 2.2.4 AMC1035
      5. 2.2.5 TPSM560R6H
      6. 2.2.6 TPSM82903
  9. 3System Design Theory
    1. 3.1 Power Switches
      1. 3.1.1 GaN-FET Selection Criterion
      2. 3.1.2 HVBUS Decoupling and 12-V Bootstrap Supply
      3. 3.1.3 GaN_FET Turn-on Slew Rate Configuration
      4. 3.1.4 PWM Input Filter and Dead-Time Calculation
      5. 3.1.5 Signal Level Shifting
      6. 3.1.6 LMG3422R030 Fault Reporting
      7. 3.1.7 LMG3422R030 Temperature Monitoring
    2. 3.2 Phase Current Sensing
      1. 3.2.1 Shunt
      2. 3.2.2 AMC1306M05 Analog Input-Filter
      3. 3.2.3 AMC1306M05 Digital Interface
      4. 3.2.4 AMC1306M05 Supply
    3. 3.3 DC-Link (HV_BUS) Voltage Sensing
    4. 3.4 Phase Voltage Sensing
    5. 3.5 Control Supply
    6. 3.6 MCU Interface
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
      1. 4.1.1 PCB
      2. 4.1.2 MCU Interface
    2. 4.2 Software Requirements
    3. 4.3 Test Setup
      1. 4.3.1 Precautions
      2. 4.3.2 Test Procedure
    4. 4.4 Test Results
      1. 4.4.1 24-V Input Control Supply
      2. 4.4.2 Propagation Delay PWM to Phase Voltage Switch Node
      3. 4.4.3 Switch Node Transient at 320-VDC Bus Voltage
      4. 4.4.4 Phase Voltage Linearity and Distortion at 320 VDC and 16-kHz PWM
      5. 4.4.5 Inverter Efficiency and Thermal Characteristic
        1. 4.4.5.1 Efficiency Measurements
        2. 4.4.5.2 Thermal Analysis and SOA Without Heat Sink at 320 VDC and 16-kHz PWM
  11. 5Design and Documentation Support
    1. 5.1 Design Files
      1. 5.1.1 Schematics
      2. 5.1.2 BOM
      3. 5.1.3 PCB Layout Recommendations
        1. 5.1.3.1 Layout Prints
      4. 5.1.4 Altium Project
      5. 5.1.5 Gerber Files
      6. 5.1.6 Assembly Drawings
    2. 5.2 Tools and Software
    3. 5.3 Documentation Support
    4. 5.4 Support Resources
    5. 5.5 Trademarks
  12. 6About the Author

4.3.1 Precautions

This reference design is a non-isolated hot-side MCU controlled 3-phase power stage with functional isolation for the top-side GaN-FET drivers only and operates from a supply voltage up to 400 VDC (MAX). Therefore, the PCB is exposed to voltages above 60-VDC and 25-VAC and hence extreme care must be exercised while testing.

This reference design is meant for exploring TI’s GaN-FET technology in a lab space only and to be used by professional engineers, who are qualified to work with high voltage. A high-voltage warning symbol is added to the PCB top and bottom side. Users must make sure proper high-voltage safety precautions are observed before and while testing. Do not directly handle exposed terminals (high voltage or otherwise) while power is turned on. All connections must be done while the reference design is de-energized and not powered-up. Even during operation at room temperature around 25°C, some components and parts of the PCB surface can reach temperatures higher than 100°C. A high temperature warning symbol is added to the PCB top and bottom side. Do not touch the PCB as contact can cause burns.

After removing power from the PCB, let the PCB cool down for some time and make sure the DC-link capacitor is discharged to 0 V before handling the PCB again.

WARNING:

GUID-E47B49AC-A9B8-4FE0-B8F0-0EC65493F6B3-low.gif Danger! High Voltage. Electric shock is possible when connecting board to live wire. Board must be handled with care only by a professional person, qualified to work with high voltage. For safety, use of isolated test equipment with overvoltage and overcurrent protection is highly recommended.

WARNING:

GUID-6C26CEE3-4697-4A3D-A1B3-6BB6CE602F17-low.gif Hot surface! Contact can cause burns. Do not touch!

WARNING:

GUID-CCF5DAE3-BA7A-41C4-993C-61CC637CBC0F-low.gif Do not leave the board powered when unattended.