DRV10983ZPWPR datasheet(22/58 Pages) TI1

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DRV10983

SLVSCP6C – JULY 2014 – REVISED MAY 2016

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Reverse drive is suitable for applications where the load condition is light at low speed and relatively constant

and where the reverse speed is low (that is, a fan motor with little friction). For other load conditions, the motor

brake function provides a method for helping force a motor which is spinning in the reverse direction to stop

spinning before a normal start-up sequence.

9.4.3.4 Motor Brake

The motor brake function can be used to stop the spinning motor before attempting to start the motor. The brake

is applied by turning on all three of the low-side driver FETs.

Brake is enabled by configuring non zero value for BrkDoneThr[2:0]. Braking is applied for time configurd by

BrkDoneThr[2:0] (reverse or forward). After the motor is stopped, the motor position is unknown. To proceed with

restarting in the correct direction, the IPD or Align and Go algorithm needs to be implemented. The motor start

sequence is the same as it would be for a motor starting in the stationary condition.

The motor brake function can be disabled. The motor skips the brake state and attempts to spin the motor as if it

were stationary. If this happens while the motor is spinning in either direction, the start-up sequence may not be

successful.

9.4.3.5 Motor Initialization

9.4.3.5.1

Align

DRV10983 aligns a motor by injecting dc current through a particular phase pattern which is current flowing into

phase V, flowing out from phase W for a certain time (configured by AlignTime[2:0]). The current magnitude is

determined by OpenLCurr[1:0]. The motor should be aligned at the known position.

The time of align affects the start-up timing (refer to Start-Up Timing ). A bigger inertial motor requires longer

align time.

9.4.3.5.2

IPD

The inductive sense method is used to determine the initial position of the motor when IPD is enabled. IPD is

enabled by selecting IPDCurrThr[3:0] to any value other than 0000.

IPD can be used in applications where reverse rotation of the motor is unacceptable. Because IPD does not

need to wait for the motor to align with the commutation, it can allow for a faster motor start sequence. IPD works

well when the inductance of the motor varies as a function of position. Because it works by pulsing current to the

motor, it can generate acoustics which must be taken into account when determining the best start method for a

particular application.

9.4.3.5.2.1

IPD Operation

The IPD operates by sequentially applying voltage across two of the three motor phases according to the

following sequence: VW WV UV VU WU UW (see Figure 13). When the current reaches the threshold configured

in IPDCurrThr[3:0], the voltage across the motor is stopped. The DRV10983 measures the time it takes from

when the voltage is applied until the current threshold is reached. The time varies as a function of the inductance

in the motor windings. The state with the shortest time represents the state with the minimum inductance. The

minimum inductance is because of the alignment of the north pole of the motor with this particular driving state.

DRV10983ZPWPR Datasheet(PDF) 22 Page - Texas Instruments

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