SLVUCC2 October   2021 MCT8316A

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Hardware Setup
      1. 1.1.1 Jumper Configuration
      2. 1.1.2 External Connections
  3. 2Quick Tuning
  4. 3Comprehensive Tuning
    1. 3.1 Cycle by cycle current limit
      1. 3.1.1 Selecting ILIMIT Pin Resistor
    2. 3.2 Motor Startup Settings
      1. 3.2.1 Motor Startup Profile
      2. 3.2.2 Motor startup method
        1. 3.2.2.1 Initial Position detect (IPD)
        2. 3.2.2.2 Double align
      3. 3.2.3 Selecting RMP_1 and RMP_2 Pin Resistors
    3. 3.3 Abnormal Speed Threshold
      1. 3.3.1 Selecting CONFIG_3 Pin Resistor
    4. 3.4 PWM Switching Frequency
      1. 3.4.1 Selecting CONFIG_1 Pin Resistor
    5. 3.5 Lead Angle
      1. 3.5.1 Steps to Tune Lead Angle
      2. 3.5.2 Selecting LDANGLE pin resistor
    6. 3.6 Slew Rate and Buck Voltage
      1. 3.6.1 Selecting SLEW_RATE Pin Resistor
  5. 4Revision History

1 Introduction

The MCT8316AT provides three half-H-bridge integrated MOSFET drivers with sensorless trapezoidal control to drive a three-phase brushless DC (BLDC) motor at 12-V/24-V DC rails or battery powered applications. The device integrates three current-sense amplifiers (CSA) with integrated current sense for sensing the three phase currents of BLDC motors to achieve optimum trapezoidal control. Simplified schematic of MCT8316AT is shown in Figure 1-1.

Figure 1-1 MCT8316AT Simplified Schematic

This tuning guide provides the steps to tune a 3-phase BLDC motor using the MCT8316AT. The tuning process is classified into two sections: Quick tuning and Comprehensive tuning. This process is also detailed in the Guided tuning section in the GUI.

  • Quick tuning: The goal of quick tuning is to get the motor running quickly by providing default resistor values for RMP_1, RMP_2, LDANGLE, CONFIG_1, ILIMIT, CONFIG_2, CONFIG_3 and SLEW_RATE pins of MCT8316AT.

  • Comprehensive tuning: The comprehensive tuning section provides a simplified methodology for tuning critical device parameters such as Motor startup profile, motor startup method, lead angle, PWM switching frequency, Cycle by cycle current limit, abnormal speed threshold, slew rate and Buck voltage.