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DRV10963 Datasheet(PDF) 8 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) 8 Page - Texas Instruments

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100% output
Vph
pk
VCC
VCC*PWMdc
DRV10963
SLAS955A – MARCH 2013 – REVISED JULY 2015
www.ti.com
7.3 Feature Description
7.3.1 Speed Input and Control
The DRV10963 provides 3-phase 25-kHz PWM outputs which have an average value of sinusoidal waveforms
from phase to phase. When any phase is measured with reference to ground, the waveform observed will be a
PWM encoded sinusoid coupled with 3rd order harmonics as shown in Figure 2. This encoding scheme simplifies
the driver requirements because there will always be one phase output that is equal to zero.
Figure 2. Sinusoidal Phase Encoding Used in DRV10963
The output amplitude is determined by the supply voltage (VCC) and the commanded PWM duty cycle (PWM) as
described in Equation 1 and illustrated in Figure 3. The maximum amplitude is applied when the commanded
PWM duty cycle is 100%.
Vphpk = PWMdc × VCC
(1)
Figure 3. Output Voltage Amplitude Adjustment
The motor speed is controlled indirectly by using the PWM command to control the amplitude of the phase
voltages which are applied to the motor.
The duty cycle of PWM input is converted into a 9 bit digital number (from 0 to 511). The control resolution is
1/512
≈ 0.2%. The duty cycle analyzer implements a first order transfer function between the input duty cycle and
the 9 bits digital number. This is illustrated in Figure 4, where
τ=80 ms.
8
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Product Folder Links: DRV10963


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