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DRV10974 データシート(PDF) 16 Page - Texas Instruments

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部品番号 DRV10974
部品情報  12-V, Three-Phase, Sensorless BLDC Motor Driver
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI1 - Texas Instruments

DRV10974 データシート(HTML) 16 Page - Texas Instruments

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Power On
Calibration
Align
Accelerate
Coasting
Closed Loop
Wait t(LOCK_OFF)
Closed Loop
Lock Detect
Open Loop
16
DRV10974
SLVSDN2 – JANUARY 2018
www.ti.com
Product Folder Links: DRV10974
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Copyright © 2018, Texas Instruments Incorporated
7.3.7 Overtemperature Protection
The DRV10974 device has a thermal shutdown function which disables the motor operation when the device
junction temperature has exceeded the TSD temperature. Motor operation resumes when the junction
temperature becomes lower than TSD – TSD(hys).
7.3.8 Undervoltage Protection
The DRV10974 device has an undervoltage lockout feature, which prevents motor operation whenever the
supply voltage (VCC) becomes too low. Upon power up, the DRV10974 device operates when VCC rises above
V(UVLO_F) + Vhys(UVLO). The DRV10974 device continues to operate until VCC falls below V(UVLO_F).
7.4 Device Functional Modes
7.4.1 Spin-Up Settings
7.4.1.1 Motor Start
The DRV10974 device starts the motor using a procedure which is shown in Figure 14.
Figure 14. DRV10974 Initialization and Motor Start-Up Sequence
7.4.1.2 Align
To align the rotor to the commutation logic, the DRV10974 device applies a current equivalent to the closed-loop
run current to phase U by driving phases V and W equally . This condition is maintained for a maximum of 0.67
s. To avoid a sudden change in current that could result in undesirable acoustics, the applied current is applied
gradually to the motor at a rate of 1.2 A / 100 ms.
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 startup profile can be configured using an external resistor to set the acceleration profile before
transitioning to closed-loop operation. Figure 15 shows this acceleration profile. During closed loop operation the
RMP pin controls the closed-loop acceleration and deceleration.Table 2 lists the selectable acceleration
parameters.


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