ZHCSHA0E January 2018 – March 2021 DRV10974
PRODUCTION DATA
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3 Feature Description
- 7.4 Device Functional Modes
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
封裝選項
機械數據 (封裝 | 引腳)
散熱焊盤機械數據 (封裝 | 引腳)
訂購信息
7.4.2 Open-Loop Acceleration
After the motor is confirmed to be stationary and after completing the motor initialization, the DRV10974 device begins to accelerate the motor. This acceleration is accomplished by applying a voltage to the motor at the appropriate drive state and increasing the rate of commutation without regard to the actual position of the motor (referred to as open-loop operation). The function of the open-loop operation is to drive the motor to a minimum speed so that the motor generates sufficient BEMF to allow the commutation control logic to drive the motor accurately.
The motor start-up profile can be configured using an external resistor to set the acceleration profile before transitioning to closed-loop operation. #T4509467-64 shows this acceleration profile. During closed-loop operation the RMP pin controls the closed-loop acceleration and deceleration. Table 7-2 lists the selectable acceleration parameters.
| RMP SELECTION | RRMP [kΩ]#SLVSDN21010 | Accel2 [Hz/s2] | Accel1 [Hz/s] | CLOSED-LOOP-ACCELERATION TRANSITION TIME [s]#SLVSDN21001 | CLOSED-LOOP-DECELERATION TRANSITION TIME [s]#SLVSDN21009 |
|---|---|---|---|---|---|
| 0 | 7.32 | 0.22 | 4.6 | 2.7 | 44 |
| 1 | 10.7 | 1.65 | 9.2 | 2.7 | 22 |
| 2 | 14.3 | 1.65 | 15 | 1 | 22 |
| 3 | 17.8 | 3.3 | 25 | 1 | 11 |
| 4 | 22.1 | 7 | 25 | 0.2 | 44 |
| 5 | 28 | 7 | 35 | 0.2 | 22 |
| 6 | 34 | 14 | 50 | 0.2 | 22 |
| 7 | 41.2 | 27 | 75 | 0.2 | 11 |
| 8 | 49.9 | 27 | 75 | 5.4 | 11 |
| 9 | 59 | 14 | 50 | 8 | 22 |
| 10 | 71.5 | 7 | 35 | 11 | 22 |
| 11 | 86.6 | 7 | 25 | 22 | 44 |
| 12 | 105 | 3.3 | 25 | 5.4 | 11 |
| 13 | 124 | 1.65 | 15 | 8 | 22 |
| 14 | 150 | 1.65 | 9.2 | 11 | 22 |
| 15 | 182 | 0.22 | 4.6 | 22 | 44 |
Figure 7-14 Start-Up Profile