DRV10983_15 Datasheet, PDF (30/57 Pages) Texas Instruments – DRV10983 12- to 24-V, Three-Phase, Sensorless BLDC Motor Driver

DRV10983
SLVSCP6B – JULY 2014 – REVISED FEBRUARY 2015
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Each of the five lock-detect schemes and the no motor detection can be disabled by respective register bits
LockEn[5:0].
When a lock condition is detected, the MtrLck in the Status register is set. The FaultCode register provides an
indication of which of the six different conditions was detected on Lock5 to Lock0. These bits are reset when the
motor restarts. The bits in the FaultCode register are set even if the lock detect scheme is disabled.
The DRV10983 reacts to either locked rotor or no motor connected conditions by putting the output drivers into a
high-impedance state. To prevent the energy in the motor from pumping the supply voltage, the DRV10983
incorporates an anti-voltage-surge (AVS) process whenever the output stages transition into the high-impedance
state. The AVS function is described in AVS Function. After entering the high-impedance state as a result of a
fault condition, the system tries to restart after t_{LOCK_OFF}.
LockEn (0, 1, 2, 3, 4, 5)
Lock detection current limit
Speed abnormal
BEMF abnormal
No motor fault
Tri-state
Or
and restart
logic
Open loop stuck
Closed loop stuck
Register
Status[4]
Set
Register: ^Reset
FaultCode [5:0]
Figure 27. Lock Detect and Fault Diagnose
9.4.7.1 Lock0: Lock Detection Current Limit Triggered
The lock detection current limit function provides a configurable threshold for limiting the current to prevent
damage to the system. This is often tripped in the event of a sudden locked rotor condition. The DRV10983
continuously monitors the current in the low-side drivers as shown in Figure 28. If the current goes higher than
the threshold configured by the HWiLimitThr[2:0] bits, then the DRV10983 stops driving the motor by placing the
output phases into a high-impedance state. The MtrLck bit is set and a lock condition is reported. It retries after
t_{LOCK_OFF}.
Set the lock detection current limit to a higher value than the acceleration current limit.
+
–
DAC
Digital Core
Figure 28. Lock Detection Current Limit
30
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