DRV10964 Datasheet, PDF (14/27 Pages) Texas Instruments – Three-Phase Sinusoidal Sensorless BLDC Motor Driver

DRV10964
SLDS227 – MARCH 2016
www.ti.com
7.3.8 Overtemperature Protection
The DRV10964 contains a thermal shut down function which disables motor operation when the device junction
temperature has exceeded T_SD. Motor operation will resume when the junction temperature becomes lower than
T_SD - T_{SD_HYS}.
7.3.9 Undervoltage Protection
The DRV10964 contains an undervoltage lockout feature, which prevents motor operation whenever the supply
voltage (VCC) becomes too low. Upon power up, the DRV10964 will operate once VCC rises above V_{UVLO_H}.
The DRV10964 will continue to operate until VCC falls below V_{UVLO_L}.
7.3.10 CONFIG Configuration
The CONFIG pin provides an option for selecting the open loop to closed loop threshold. This is accomplished
with the selection of a resistor divider between VCC and GND which is connected to the CONFIG pin. See
Electrical Characteristics.
7.4 Device Functional Modes
7.4.1 Spin up Settings
7.4.1.1 Motor Kt and Rm
DRV10964 utilizes information about the motor's torque constant and resistance to control motor timing. These
parameters are measured during the initial motor spin up as shown in Figure 14.
7.4.1.2 Motor Start
DRV10964 will start the motor using a procedure which is illustrated in Figure 14.
Power On
Wait TOFF_LOCK
Calibration
Align
Accelerate
Coasting
40 ms
Resistance
Measurement
Open Loop
Kt
Measurement
Lock Detected
Close Loop
Closed Loop
Figure 14. DRV10964 Initialization and Motor Start-up Sequence
7.4.1.3 Initial Speed Detect (ISD)
The ISD function is used to identify the initial condition of the motor.
Phase-to-phase comparators are used to detect the zero crossings of the motor’s BEMF voltage while it is
coasting (motor phase outputs are in high-impedance state). Figure 15 shows the configuration of the
comparators.
14
Submit Documentation Feedback
Product Folder Links: DRV10964
Copyright © 2016, Texas Instruments Incorporated