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DRV10974 датащи(PDF) 12 Page - Texas Instruments

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номер детали DRV10974
подробное описание детали  12-V, Three-Phase, Sensorless BLDC Motor Driver
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI1 - Texas Instruments

DRV10974 датащи(HTML) 12 Page - Texas Instruments

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background image
(FG)
¦
RPM
pole _ pairs
u
0
1.5%
15%
15%
Input Duty Cycle
Duty cycle
clamp
Duty cycle off
Rising duty
cycle
PWM Input
Amplitude of Output
Sine Wave
PWM Output
LPF
12
DRV10974
SLVSDN2 – JANUARY 2018
www.ti.com
Product Folder Links: DRV10974
Submit Documentation Feedback
Copyright © 2018, Texas Instruments Incorporated
Figure 7. PWM Command Input Control Diagram
The output peak amplitude is described by Equation 1 when PWMdc > 15% (the minimum-operation duty cycle).
When the PWM-commanded duty cycle is lower than the minimum-operation duty cycle and higher than 1.5%,
the output is controlled the by the minimum-operation duty cycle (DCMIN_F). This is shown in Figure 8 for analog
input, and for pulse durations greater than 120 ns for digital input. If the supply voltage (VVCC) > 14 V, the
maximum PWMDC is limited to 14 V/VVCC.
Figure 8. Speed-Control Transfer Function
7.3.2 Motor Direction Change
The DRV10974 device can be easily configured to drive the motor in either direction by setting the input on the
FR (forward-reverse) pin to a logic 1 or logic 0 state. The direction of commutation as described by the
commutation sequence is defined as follows:
FR = 0
U
→V→W
FR = 1
U
→W→V
7.3.3 Motor-Frequency Feedback (FG)
During operation of the DRV10974 device, the FG pin provides an indication of the speed of the motor. The FG
pin toggles at a rate of one time during an electrical cycle. Using this information and the number of pole pairs in
the motor, use Equation 2 to calculate the mechanical speed of the motor.
(2)
During open-loop acceleration the FG pin indicates the frequency of the signal that is driving the motor. The lock
condition of the motor is unknown during open-loop acceleration and therefore the FG pin could toggle during
this time even though the motor is not moving.


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