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DRV10974 Datasheet(PDF) 17 Page - Texas Instruments |
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DRV10974 Datasheet(HTML) 17 Page - Texas Instruments |
17 / 29 page Time Speed Open Loop Acceleration Align Time Closed Loop Speed = Accel1 x t + 0.5 x Accel2 x t 2 17 DRV10974 www.ti.com SLVSDN2 – JANUARY 2018 Product Folder Links: DRV10974 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated Device Functional Modes (continued) Table 2. Acceleration Profile Settings RMP SELECTION RRMP [kΩ] Accel2 [Hz/s2] Accel1 [Hz/s] CLOSED-LOOP ACCELERATION [s] CLOSED-LOOP DECELERATION [s] 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 15. Startup Profile 7.4.3 Start-Up Current Sensing The start-up peak current is controlled by the current-sense limit resistor, R(CS). The start current is set by selecting the R(CS) resistor based on Table 3. The current should be selected to allow the motor to accelerate reliably to the handoff threshold. Heavier loads may require a higher current setting, but the rate of acceleration is limited by the programmed resistor, R(RMP). |
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