DRV10983-Q1 Datasheet, PDF (12/72 Pages) Texas Instruments – Automotive, Three-Phase, Sensorless BLDC Motor Driver

DRV10983-Q1
SLVSD14 – JUNE 2017
Feature Description (continued)
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IC
5V
V_CC VREG
47 µH
SW
10 µF
SWGND
Load
IC
5V
V_CC VREG
39 Ω
SW
10 µF
SWGND
Buck Regulator with External Inductor
Buck Regulator with External Resistor
Figure 4. Step-Down Regulator Configurations
8.3.1.2 3.3-V and 1.8-V LDO
The DRV10983-Q1 device includes a 3.3-V LDO and a 1.8-V LDO. The 1.8-V LDO is for internal circuits only.
The 3.3-V LDO is mainly for internal circuits, but can also drive external loads not to exceed I_{V3P3_MAX}. For
example, it can work as a pullup voltage for the FG, DIR, SDA, and SCL interface.
Both the V1P8 and V3P3 capacitors must be connected to GND.
8.3.2 Protection Circuits
8.3.2.1 Thermal Shutdown
The DRV10983-Q1 device has a built-in thermal shutdown function, which shuts down the device when the
junction temperature is more than T_SDN˚C and recovers operating conditions when the junction temperature falls
to T_SDN – T_{SDN_HYS}˚C.
The OverTemp status bit (address 0x00, bit 15) is set during thermal shutdown. In addition to the thermal
shutdown function there is a warning bit that is set whenever the device exceeds T_WARN and is indicated by the
TempWarning bit of the FaultReg register (address 0x00, bit 14).
8.3.2.2 UVLO
The DRV10983-Q1 device has a built-in UVLO function block. The device is locked out when V_CC is below
V_{UVLO_F} and is unlocked when V_CC is above V_{UVLO_R}. The hysteresis of the UVLO threshold is V_{UVLO_HYS}. In
addition to the main supply, the step-down regulator, charge pump, and 3.3-V LDO all have undervoltage lockout
monitors.
8.3.2.3 Current Protection
The overcurrent shutdown function acts to protect the device if the current, as measured from the FETs, exceeds
the I_OC-limit threshold. It protects the device in the event of a short-circuit condition on the motor phases. This
includes phase shorts to GND, phase shorts to phase, or phase shorts to V_CC. The DRV10983-Q1 device places
the output drivers into a high-impedance state until the lock time t_{LOCK_OFF} has expired. The OverCurr status bit
of the FaultReg register (address 0x00, bit 11) is set.
The DRV10983-Q1 device also provides acceleration current-limit and lock-detection current-limit functions to
protect the device and motor (see Current Limit and Lock Detect and Fault Handling ).
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