ZHCSDA8E January 2015 – May 2018 DRV10975
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 5 說明 （續）
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3 Feature Description
- 8.4
Device Functional Modes
- 8.4.1 Motor Parameters
- 8.4.2 Starting the Motor Under Different Initial Conditions
- 8.4.3 Motor Start Sequence
- 8.4.4 Start-Up Current Setting
- 8.4.5 Closed Loop
- 8.4.6 Current Limit
- 8.4.7 Lock Detect and Fault Handling
- 8.4.8 AVS Function
- 8.4.9 PWM Output
- 8.4.10 FG Customized Configuration
- 8.4.11
Diagnostics and Visibility
- 8.4.11.1 Motor Status Readback
- 8.4.11.2 Motor Speed Readback
- 8.4.11.3 Motor Electrical Period Readback
- 8.4.11.4 BEMF Constant Readback
- 8.4.11.5 Motor Estimated Position by IPD
- 8.4.11.6 Supply Voltage Readback
- 8.4.11.7 Speed Command Readback
- 8.4.11.8 Speed Command Buffer Readback
- 8.4.11.9 Fault Diagnostics
- 8.5 Register Maps
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12器件和文檔支持
- 13機械、封裝和可訂購信息
封裝選項
機械數據 (封裝 | 引腳)
散熱焊盤機械數據 (封裝 | 引腳)
- PWP|24
訂購信息
8.4.3.6 Start-Up Timing
Start-up timing is determined by the align and accelerate time. The align time can be set by AlignTime[2:0], as described in Register Definition. The accelerate time is defined by the open-to-closed loop threshold Op2ClsThr[4:0] along with the first order StAccel[2:0](A1) and second order StAccel2[2:0](A2) acceleration coefficient. Figure 18 shows the motor start-up process.
Figure 18. Motor Start-Up Process Select the first order and second order acceleration coefficient to allow the motor to reliably accelerate from zero velocity up to the closed loop threshold in the shortest time possible. Using a slow acceleration coefficient during the first order accelerate stage can help improve reliability in applications where it is difficult to accurately initialize the motor with either align or IPD.
Select the open-to-closed loop threshold to allow the motor to accelerate to a speed that generates sufficient BEMF for closed loop control. This is determined by the velocity constant of the motor based on the relationship described in Equation 2.