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DRV10963 Datasheet(PDF) 10 Page - Texas Instruments

Part No. DRV10963
Description  DRV10963 5-V, Three-Phase, Sensorless BLDC Motor Driver
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

DRV10963 Datasheet(HTML) 10 Page - Texas Instruments

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Speed(Hz)
Open loop to
close loop
transition
threshold
Close Loop
Open Loop
Accelerate
Time (s)
0 Align
Calibration
Align
Accelerate
Coasting
Close Loop
Kt
Measurement
300 ms
Resistance
Measurement
Wait T
OFF_LOCK
Power On
Open Loop
Closed Loop
Lock Detected
DRV10963
SLAS955A – MARCH 2013 – REVISED JULY 2015
www.ti.com
To align the rotor to the commutation logic the DRV10963 applies an x% duty cycle on phases V and W while
holding phase U at GND. This condition is maintained for TAlign seconds. The x% value is determined by the
VCC voltage (as shown in Table 2) to maintain sufficient driving torque over a wide range of supply voltages.
Figure 7. DRV10963 Initialization and Motor Start-up Sequence
Table 2. Align and Open Loop Duty Cycle
DUTY CYCLE DURING ALIGN
VCC VOLTAGE
AND OPEN LOOP (X)%
5.25 to approximately 6 V
43%
4.5 to approximately 5.25 V
50%
3.75 to approximately 4.5 V
60%
3 to approximately 3.75 V
75%
<3
100%
When the align phase completes, the motor is accelerated by applying sinusoidal phase voltages with peak
magnitudes as illustrated in Table 2 and stepping through the commutation sequence at an increasing rate
described by RAcc until the rate of commutation reaches HOffth Hz. When this threshold is reached, the DRV10963
switches to closed loop mode where the commutation drive sequence is determined by the internal control
algorithm and the applied voltage is determined by the PWM commanded duty cycle input. The open loop to
close loop transition threshold (HOffth), align time (TAlign), and the accelerate rate (RAcc) are device configurable
through OTP settings (HO_TH[3:0], TARA_TH[3:0]).
Figure 8. DRV10963 Start-up Profile
The selection of handoff threshold (HOffth) can be determined by experimental testing. The goal is to choose a
handoff threshold that is as low as possible and allows the motor to smoothly and reliably transition between the
open loop acceleration and the closed loop acceleration. Normally higher speed motors (maximum speed)
require a higher handoff threshold because higher speed motors have lower Kt and as a result lower BEMF.
Table 3 shows the configurable settings for the handoff threshold. Maximum speed in electrical Hz are shown as
a guide to assist in identifying the appropriate handoff speed for a particular application.
10
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Copyright © 2013–2015, Texas Instruments Incorporated
Product Folder Links: DRV10963


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