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

3.5 Control Supply

The TIDA-010255 requires an external 24-V DC supply with a tolerance of ±20% at connector J5 to generate the 12-V, 5-V, and 3.3-V non-isolated power rails to supply the signal chain and the C2000 MCU controlCARD through the 180-pin connector J1 and J2.

WARNING: The TIDA-010255 is a hot-side MCU controlled power stage with functional isolation only for the high-side power switches and related sensing components like the isolated delta-sigma modulators. The GND reference of the 24-V control supply is connected to the high-voltage GND HV_GND.

The point-of-load supplies for 12 V, 5 V, and 3.3 V are shown in Figure 3-10. A diode D6 protects for reverse polarity connection of the 24-V supply.

The first stage of the power tree converts the 24-V input to 12-V output. The TPSM560R6H power module with integrated shielded inductor is used for this DC/DC buck conversion. The output voltage is configured through the feedback resistors R41 (10 kΩ) and R43 (90 kΩ) following the standard RFBB values table in the TPSM560R6H, 60-V Input, 1-V to 16-V Output, 600-mA Power Module in an Enhanced HotRod™ QFN Package data sheet for VOUT equals 12 V. The input and output capacitances follow the minimum input capacitance and minimum output capacitance requirements from the TPSM560R6H data sheet.

The second stage of the power tree converts 12 V to 5 V. The TPSM82903, 3-A, 3-V to 17-V, DC-DC converter with integrated inductor in a very small MicroSiP package module is used for this conversion. The output voltage is configured through the feedback resistors R34 (732 kΩ) and R45 (100 kΩ) for VOUT equal to 5 V. Reduce the resistance of R43 to 182 kΩ and R45 to 24.9 kΩ according to the setting the output voltage table in the TPSM82903, 3-A, 3-V to 17-V, High Efficiency and Low IQ Buck Converter Module in a MicroSiP Package with an Integrated Inductor data sheet.

The third stage of the power tree converts 5 V to 3.3 V with the TPSM82903 too. The output voltage is configured through the feedback resistors R46 (113 kΩ) and R47 (24.9 kΩ) following the setting the output voltage table in the TPSM82903 data sheet for VOUT equal to 3.3 V. The 3.3-V output can be disabled by pulling down the 3V3_EN signal through the MCU, if desired.

Indicator LEDs D3, D4, and D5 turn on, when the corresponding 12-V, 3.3-V, and 5-V rails are available.

GUID-20231101-SS0I-ZHVG-GHZ3-LZQNRTKMJVL1-low.gifFigure 3-10 Schematic of 24-V Control Supply With 12-V, 5-V, and 3.3-V Rails