TIDUF68 February   2024

 

  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 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 LMG2100
      2. 2.3.2 INA241A
      3. 2.3.3 LMR38010
  9. 3System Design Theory
    1. 3.1 Three-Phase GaN Inverter Power Stage
      1. 3.1.1 LMG2100 GaN Half-Bridge Power Stage
    2. 3.2 Inline Shunt Precision-Phase Current Sensing With INA241A
    3. 3.3 Phase Voltage and DC Input Voltage Sensing
    4. 3.4 Power-Stage PCB Temperature Monitor
    5. 3.5 Power Management
      1. 3.5.1 48V to 5V DC/DC Converter
      2. 3.5.2 5V to 3.3V Rail
    6. 3.6 Interface to Host MCU
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
      1. 4.1.1 TIDA-010936 PCB Overview
      2. 4.1.2 TIDA-010936 Jumper Settings
      3. 4.1.3 Interface to C2000™ MCU LaunchPad™ Development Kit
    2. 4.2 Software Requirements
    3. 4.3 Test Setup
    4. 4.4 Test Results
      1. 4.4.1 Power Management and System Power Up and Power Down
    5. 4.5 GaN Inverter Half-Bridge Module Switch Node Voltage
      1. 4.5.1 Switch Node Voltage Transient Response at 48V DC Bus
        1. 4.5.1.1 Output Current at ±1A
        2. 4.5.1.2 Output Current at ±10A
      2. 4.5.2 Impact of PWM Frequency to DC-Bus Voltage Ripple
      3. 4.5.3 Efficiency Measurements
      4. 4.5.4 Thermal Analysis
      5. 4.5.5 No Load Loss Test (COSS Losses)
  11. 5Design and Documentation Support
    1. 5.1 Design Files {Required Topic}
      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
  13. 7Recognition

1.1 Key System Specifications

The key specifications of the TIDA-010936 small form factor three-phase GaN inverter reference design are provided in Table 1-1. The design can be directly connected to a C2000 MCU LaunchPad development 40-pin instance (J1–J3 and J4–J2). A zero Ohm resistor option is provided on the TIDA-010936 to the power the LaunchPad with 3.3V. Table 1-2 and Table 1-3 introduce the TIDA-010936 pin assignment.

Table 1-1 3-Phase Inverter Key Specifications
PARAMETERTYPICAL VALUECOMMENT
DC input voltage 48V (12V–60V)80V absolute maximum
Maximum 3-phase continues output current16ARMSTest condition: No heat sink at 25°C ambient temperature
Maximum output power 825W at 48VDCAt power factor 0.9
Power FET typeGaN technologyHalf-bridge power module with integrated high and low side gate drivers (LMG2100)
PWM switching frequency (tested)20kHz to 80kHzHigher than 80kHz PWM frequencies supported
PWM dead band 16.66ns–
Phase currents sense | amplifier1mΩ shunt | INA241ADifferential, non-isolated current sense amplifier with 50V / V and enhanced PWM rejection (INA241A)
Phase current maximum range±33AScaled to 0V–3.3V, 1.65V bias
PCB layer stack4-layer, 2oz copper
GaN-FET PCB area size16mm × 51mm3-phase GaN plus shunt
PCB size68.63mm × 70mmDimensions in mil: 2702mil × 2756mil
Temperature range–40°C to 85°C
Interface to host processorTI BoosterPack compatible See Table 1-2 and Table 1-3 for pin assignment
3.3V or 5V supply option for LaunchPadTotal 600mA (max) Enable with 0Ω resistor
Table 1-2 Interface Specification Header J2
PINSIGNALI/O (3.3V) PINSIGNALI/O (3.3V)
J2-13.3V supply (optional)O or N/C (R48 not populated)J2-25 supply (optional)O or N/C (R47 not populated)
J-23NCJ2-4GNDGND
J2-5NCJ2-6VDC_BusO (0-3.3V)(1)
J2-7NCJ2-8VAO (0-3.3V)(1)
J2-9NCJ2-10VBO (0-3.3V)(1)
J2-11NCJ2-12VCO (0-3.3V)(1)
J2-13NCJ2-14IAO (0-3.3V)
J2-15NCJ2-16IBO (0-3.3V)
J2-17NCJ2-18TempO (0-3.3V)
J2-19NCJ2-20NC
(1) Overvoltage protection with Schottky diodes provides output voltage remains below 3.6V
Table 1-3 Interface Specification Header J3
PINSIGNALI/O (3.3V) PINSIGNALI/O (3.3V)
J3-1PWM A (high-side)I (10k PD in buffer)J3-2GNDGND
J3-3PWM A (low-side)I (10k PD in buffer)J3-4NC
J3-5PWM B (high-side)I (10k PD in buffer)J3-6NC
J3-7PWM B (low-side)I (10k PD in buffer)J3-8NC
PWM C (high-side)I (10k PD in buffer)J3-10OCO
J3-11PWM C (low-side)I (10k PD in buffer)J3-12NC
J3-13NCJ3-14NC
J3-15NCJ3-16NC
J3-17NCJ3-18NC
J3-19NCJ3-20NC