TIDUF36A May   2023  – December 2023 DRV8328

 

  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 DRV8328C
      2. 2.3.2 MSPM0G1507
      3. 2.3.3 CSD18510Q5B
      4. 2.3.4 TMP61
  9. 3System Design Theory
    1. 3.1 Power Stage Design: Three-Phase Inverter
      1. 3.1.1 Selecting Sense Resistor
    2. 3.2 Power Stage Design: DRV8328 Gate Driver
      1. 3.2.1 DRV8328 Features
      2. 3.2.2 AVDD Linear Voltage Regulator (LDO)
    3. 3.3 Power Stage Design: MSPM0 Microcontroller
      1. 3.3.1 Low-Side Current Sensing With MSPM0G1507
      2. 3.3.2 Temperature Sensing
    4. 3.4 Power Stage Design: External Interface Options and Indications
      1. 3.4.1 Hall Sensor Interface
      2. 3.4.2 Input Power Voltage Monitoring
      3. 3.4.3 Motor Speed Control
      4. 3.4.4 Direction of Rotation: Digital Input
      5. 3.4.5 Programming Interface for MCU
      6. 3.4.6 Data Transmission
      7. 3.4.7 LED Indicators
      8. 3.4.8 Sleep Mode Entry Control
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
      1. 4.1.1 Hardware Board Overview
    2. 4.2 Software Requirements
    3. 4.3 Test Setup
    4. 4.4 Test Results
      1. 4.4.1 Functional Evaluation of DRV8328 Gate Driver
        1. 4.4.1.1 DRV8328 Linear Regulator Performance
        2. 4.4.1.2 Gate Drive Voltage Generated by Gate Driver
      2. 4.4.2 MOSFET Switching Waveforms
      3. 4.4.3 Current Open Loop Test
      4. 4.4.4 Current Open Loop Load Test
  11. 5Design and Documentation Support
    1. 5.1 Design Files
      1. 5.1.1 Schematics
      2. 5.1.2 BOM
    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. 7Revision History

4.4.4 Current Open Loop Load Test

Figure 4-9 through Figure 4-12 show the motor winding current and winding voltage waveforms at a 18-V DC input and a 10-ARMS, 33-A winding current, and the thermal images under the same conditions. The testing is done at 15% duty cycle.

Current waveform and thermal behavior when a large current is passed through the device can be observed. The input power is 18 V at 4 A to 5.5 A, 72 W to 100 W.

  • CH1 (Blue): U Phase Voltage
  • CH4 (Green): U Phase Current

Under the provided test conditions, in the case of 10-ARMS current, the current of the maximum MOSFET is 49.3°C.

GUID-20230516-SS0I-ZKKS-9MWK-WPMZSPLQ2S96-low.pngFigure 4-9 18-V DC Input, 10-ARMS Winding Current, 15% Duty Cycle
GUID-20230516-SS0I-BJKG-V9WS-XB2MG4DMBWHL-low.pngFigure 4-10 Thermal Image at 10-ARMS Winding Current, 15% Duty Cycle

Under the given test conditions, in the case of 33-ARMS current, the current of the maximum MOSFET is 97.1°C.

GUID-20230516-SS0I-F5D4-7591-WDLNTHT1ZW2C-low.pngFigure 4-11 18-V DC Input, 33-ARMS Winding Current, 15% Duty Cycle
GUID-20230516-SS0I-MZMV-RSGT-P4ZKBF8RBD2X-low.pngFigure 4-12 Thermal Image at 33-ARMS Winding Current, 15% Duty Cycle

Figure 4-13 shows load test setup with a dynamometer.

GUID-20230516-SS0I-5X49-J02R-RJXRJXSDLXGF-low.jpg Figure 4-13 Load Test Setup