SLLA663 March   2025 MCF8315A , MCF8315C , MCF8315C-Q1 , MCF8315D , MCF8316A , MCF8316C-Q1 , MCF8316D , MCF8329A , MCT8315A , MCT8316A , MCT8329A

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2End Application Configuration Recommendation
    1. 2.1 Resynchronization
    2. 2.2 Reverse Drive
    3. 2.3 Coasting (Hi-Z)
    4. 2.4 Startup Brake
    5. 2.5 Direction Change Mode
  6. 3Tuning Guidance
    1. 3.1 Initial Speed Detection Module
      1. 3.1.1 Initial Speed Detection
      2. 3.1.2 ISD Times
      3. 3.1.3 Stationary Detect Threshold
    2. 3.2 Resynchronization
      1. 3.2.1 Forward Drive Resync Threshold
      2. 3.2.2 Reverse Drive
      3. 3.2.3 Reverse Acceleration Parameters
      4. 3.2.4 Reverse Drive Current Limits
      5. 3.2.5 Reverse Drive Handoff Threshold
      6. 3.2.6 Reverse Drive Open Loop Deceleration (REV_DRV_OPEN_LOOP _DEC)
    3. 3.3 Coasting (Hi-Z)
    4. 3.4 Brake
      1. 3.4.1 Brake Config (BRK_CONFIG)
  7. 4Feature Availability of MCx Devices
    1. 4.1 FOC Family (MCF83xx devices)
    2. 4.2 TRAP Family (MCT83xx devices)
  8. 5Summary
  9. 6References

Abstract

The BLDC motor can either be stationary or windmilling in forward or reverse direction when a motor run (non-zero reference) command is received by MCx83xx. Depending on the initial motor state (stationary or windmilling), there are different configurable options available to drive the BLDC motor to user to set reference – MCx83xx can either apply a brake to bring the motor to a stationary state before driving to set reference; alternately, MCx83xx can also resync to motor speed and direction in real time in forward direction. This application note discusses the settings available to configure the pre-start behavior of MCx83xx to achieve designed performance for start-up.

The content is applicable for MCx83xx family:

  • MCF8315A
  • MCF8315C
  • MCF8315C-Q1
  • MCF8316A
  • MCF8316C
  • MCF8316C-Q1
  • MCF8315D
  • MCF8316D
  • MCF8329A
  • MCT8316A
  • MCT8315A
  • MCT8329A
Note:
  • MCF83xx refers to TI’s sensorless FOC based 3-phase BLDC drivers including MCF8316D, MCF8315D, MCF8316C-Q1, MCF8315C-Q1, MCF8315C, MCF8315A, MCF8316A and MCF8329A.
  • MCT83xx refers to TI’s sensorless trapezoidal commutation based 3-phase BLDC drivers including MCT8316A, MCT8316A-Q1, MCT8315A and MCT8329A.
  • MCF83xx and MCT83xx family of devices is referred to as MCx devices in this application note.