SBAU485 July   2025

 

  1.   1
  2.   Description
  3.   Applications
  4.   Features
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 BP-AMC0106-LMG-MD PCB Overview
    2. 2.2 Board Configuration Information
    3. 2.3 Header Information
    4. 2.4 EVM Setup
  8. 3Software
    1. 3.1 Software Description
    2. 3.2 Importing the Project to Code Composer Studio
    3. 3.3 Universal Servo Drive Example Modifications
    4. 3.4 Change PWM Frequency and Dead Time
    5. 3.5 Running the Motor
  9. 4Hardware Design Files
  10. 5Additional Information
    1. 5.1 Trademarks
  11. 6Related Documentation

1.3 Specification

BP-AMC0106-LMG-MD Development Kit shows the system block diagram of BP-AMC0106-LMG-MD three-phase GaN inverter evaluation module.

BP-AMC0106-LMG-MD BP-AMC0106-LMG-MD Block Diagram Figure 1-1 BP-AMC0106-LMG-MD Block Diagram

The EVM accepts voltage from an external power supply in the range from 12 to 60V, with a nominal DC input voltage of 48V. The LM7400 diode controller protects the system against reverse polarity. A wide input voltage range DC/DC converter, the LMR38010, generates 5V for the rail that supplies the GaN power stages and optionally the C2000 LaunchPad. There is a second DC/DC converter with the LMR50410 which generates 3.3V. This converter is disabled by default as the LaunchPad supplies the 3.3V rail.

The inverter power stage consists of three GaN half-bridge modules (LMG2100). The LMG2100 device integrates the gate driver and the bootstrap circuit with clamp. Control inputs of the module accept logic levels, allowing direct connection of PWM signals from the microcontroller without an additional level shifter.

Precise torque control and dynamic performance of the inverter require accurate phase current sensing. Three independent delta-sigma modulators (AMC0106M05) with the ±50mV input voltage range sense the voltage drop across 1mΩ current sensing resistor (shunt). The functional isolation completely eliminates common mode transients that are typically visible on the output of the non-isolated current sense amplifiers. The isolated part of the modulator reuses the bootstrap voltage from the GaN half-bridge module. A logic gate (SN74LVC1G17) buffers the clock signal that is shared with all three modulators.

For temperature monitoring, a linear thermistor (TMP61) senses the temperature of the printed circuit board close to the phase C half-bridge module. Additionally, four resistor dividers scale down the VBUS and phase voltages for the analog-to-digital (ADC) converter, enabling voltage monitoring.

The EVM interfaces to a host processor. The connector is compatible with the LaunchPad form-factor. By default, the signal assignment and code example are compatible with LAUNCHXL-F28P65X evaluation module. The code example implements a sensorless, speed-variable, field-oriented control of a synchronous motor using the InstaSPIN™-FOC software. The example firmware is available as a part of the C2000WARE-MOTORCONTROL-SDK and tested with a 48V low-voltage servo motor.