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DRV10975 Datasheet(PDF) 20 Page - Texas Instruments |
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DRV10975 Datasheet(HTML) 20 Page - Texas Instruments |
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20 / 64 page  20 DRV10975, DRV10975Z SLVSCP2D – JANUARY 2015 – REVISED MARCH 2018 www.ti.com Product Folder Links: DRV10975 Submit Documentation Feedback Copyright © 2015–2018, Texas Instruments Incorporated For convenience, the encoded value of Kt[6:0] may also be obtained from Table 3. Table 3. BEMF Constant Look-Up Table Kt (mV/Hz) Kt[6:0] HEX Kt (mV/Hz) Kt [6:0] HEX Kt (mV/Hz) Kt [6:0] HEX 0 000 0000 00 22.3 010 1000 28 178 101 1000 58 0.7 000 0001 01 25.1 010 1001 29 200 101 1001 59 1.39 000 0010 02 27.8 010 1010 2A 223 101 1010 5A 2.09 000 0011 03 30.6 010 1011 2B 245 101 1011 5B 2.78 000 0100 04 33.4 010 1100 2C 267 101 1100 5C 3.48 000 0101 05 36.2 010 1101 2D 290 101 1101 5D 4.18 000 0110 06 39 010 1110 2E 312 101 1110 5E 4.88 000 0111 07 41.8 010 1111 2F 334 101 1111 5F 5.57 000 1000 08 44.6 011 1000 38 356 110 1000 68 6.27 000 1001 09 50.2 011 1001 39 401 110 1001 69 6.97 000 1010 0A 55.7 011 1010 3A 446 110 1010 6A 7.66 000 1011 0B 61.3 011 1011 3B 490 110 1011 6B 8.36 000 1100 0C 66.9 011 1100 3C 535 110 1100 6C 9.06 000 1101 0D 72.5 011 1101 3D 580 110 1101 6D 9.76 000 1110 0E 78 011 1110 3E 624 110 1110 6E 10.4 000 1111 0F 83.6 011 1111 3F 669 110 1111 6F 11.1 001 1000 18 89.2 100 1000 48 713 111 1000 78 12.5 001 1001 19 100 100 1001 49 803 111 1001 79 13.9 001 1010 1A 111 100 1010 4A 892 111 1010 7A 15.3 001 1011 1B 122 100 1011 4B 981 111 1011 7B 16.7 001 1100 1C 133 100 1100 4C 1070 111 1100 7C 18.1 001 1101 1D 145 100 1101 4D 1160 111 1101 7D 19.5 001 1110 1E 156 100 1110 4E 1240 111 1110 7E 20.9 001 1111 1F 167 100 1111 4F 1330 111 1111 7F 8.4.2 Starting the Motor Under Different Initial Conditions The motor can be in one of three states when the DRV10975 attempts to begin the start-up process. The motor may be stationary, or spinning in the forward or reverse directions. The DRV10975 includes a number of features to allow for reliable motor start under all of these conditions. Figure 10 shows the motor start-up flow for each of the three initial motor states. 8.4.2.1 Case 1 – Motor Is Stationary If the motor is stationary, the commutation logic must be initialized to be in phase with the position of the motor. The DRV10975 provides for two options to initialize the commutation logic to the motor position. Initial position detect (IPD) determines the position of the motor based on the deterministic inductance variation, which is often present in BLDC motors. The Align and Go technique forces the motor into alignment by applying a voltage across a particular motor phase to force the motor to rotate in alignment with this phase. The following sections explain how to configure these techniques for use in the designer's system. 8.4.2.2 Case 2 – Motor Is Spinning in the Forward Direction If the motor is spinning forward with enough velocity, the DRV10975 may be configured to go directly into closed loop. By resynchronizing to the spinning motor, the user achieves the fastest possible start-up time for this initial condition. |
Similar Part No. - DRV10975_18 |
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Similar Description - DRV10975_18 |
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