DRV10987 Datasheet, PDF (22/69 Pages) Texas Instruments – DRV10987 12- to 24-V, Three-Phase, Sensorless BLDC Motor Driver

DRV10987
SLVSE89 – AUGUST 2017
8.4.3 Motor Start Sequence
Figure 13 shows the motor-start sequence implemented in the DRV10987 device.
Power on
DIR pin
change
ISDen
N
Y
ISD
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Y
Forward
N
Y
Speed >
RvsDrThr
N
RvsDrEn
Y
RvsDr
N
Speed <
ISDThr
Y
BrkEn
N
Y
N
Brake
Time >
Y
BrkDoneThr
N
Accelerate
IPDEn
Y
N
Align
IPD
N
Speed >
Op2CIsThr
ClosedLoop
Y
Figure 13. Motor Starting-Up Flow
Accelerate State The DRV10987 device accelerates the motor according to the settings of StAccel and
StAccel2. After applying the accelerate settings, the MSS advances to the Speed>Op2ClsThr
judgment.
Align State The DRV10987 device performs the align function (see Align). After the align completes, the MSS
transitions to the Accelerate state.
Brake State The device performs the brake function (see Motor Brake).
BrkEn Judgment The MSS checks to determine whether the brake function is enabled (BrkDoneThr[2:0] ≠ 000).
If the brake function is enabled, the MSS advances to the brake state.
ClosedLoop State In this state, the DRV10987 device drives the motor based on feedback from the
commutation control algorithm.
DIR Pin Change Judgment If the DIR pin is changed during any of above states, DRV10987 device stops
driving the motor and restarts from the beginning.
Forward Judgment The MSS determines whether the motor is spinning in the forward or the reverse direction.
If the motor is spinning in the forward direction, the DRV10987 device executes the
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