DRV10983_15 Datasheet, PDF (13/57 Pages) Texas Instruments – DRV10983 12- to 24-V, Three-Phase, Sensorless BLDC Motor Driver

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Feature Description (continued)
DRV10983
SLVSCP6B – JULY 2014 – REVISED FEBRUARY 2015
U-V
U
V-W
V
W-U
W
Sinusoidal voltage from phase to phase
Sinusoidal voltage with third order harmonics
from phase to GND
Figure 7. Representing Sinusoidal Voltages With Third-Order Harmonic Output
The output amplitude is determined by the magnitude of VCC and the PWM duty cycle output (PWM_DCO). The
PWM_DCO represents the peak duty cycle that is applied in one electrical cycle. The maximum amplitude is
reached when PWM_DCO is at 100%. The peak output amplitude is VCC. When the PWM_DCO is at 50%, the
peak amplitude is VCC / 2 (see Figure 8).
100% PWM DCO
50% PWM DC0
VCC
VCC/2
Figure 8. Output Voltage Amplitude Adjustment
9.3.4 Sleep or Standby Condition
The DRV10983 is available in either a sleep mode or standby mode version. The DRV10983 enters either sleep
or standby to conserve energy. When the device enters either sleep or standby, the motor stops driving. The
switching regulator is disabled in the sleep mode version to conserve more energy. The I²C interface is disabled
and any register data not stored in EEPROM will be reset. The switching regulator remains active in the standby
mode version. The register data is maintained, and the I²C interface remains active.
Setting sleepDis = 1 prevents the device from entering into the sleep or standby condition. If the device has
already entered into sleep or standby condition, setting sleepDis = 1 will not take it out of the sleep or standby
condition. During a sleep or standby condition, the Slp_Stdby status bit (address 0x10, bit 6) will be set.
For different speed command modes, Table 1 shows the timing and command to enter the sleep or standby
condition.
Table 1. Conditions to Enter or Exit Sleep or Standby Condition
Speed
Command
Mode
Analog
PWM
Enter Sleep/Standby Condition
SPEED pin voltage < V_{EN_SL_SB} for
T_{EN_SL_SB}
SPEED pin low ( V < V_{DIG_IL}) for
T_{EN_SL_SB}
Exit from Standby Condition
Exit from Sleep Condition
SPEED pin voltage > V_{EX_SB} for T_{EX_ SB}
SPEED pin high ( V > V_{DIG_IH}) for
T_{EX_SL_SB}
SPEED pin high ( V > V_{DIG_IH}) for
T_{EX_SL_SB}
SPEED pin high ( V > V_{DIG_IH}) for
T_{EX_SL_SB}
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