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DRV10963 Datasheet(PDF) 14 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
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DRV10963 Datasheet(HTML) 14 Page - Texas Instruments

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DRV10963
SLAS955A – MARCH 2013 – REVISED JULY 2015
www.ti.com
7.3.5.4 Open Loop Stuck
This lock condition is active when the DRV10963 device is operating in the open loop mode. When the open loop
commutation rate becomes higher than the open to closed loop threshold (HOffth - see Figure 8) and the zero
cross is not detected for the time corresponding to 2 electrical cycles then this is an indication that the motor is
not moving. Under this condition the open loop stuck lock condition will be triggered.
7.3.6 Soft Current Limit
The current limit function provides active protection for preventing damage as a result of high current. The soft
current limit does not use direct current measurement for protection, but rather, uses the measured motor
resistance (Rm) and motor velocity constant (Kt) to limit the voltage applied to the phase (U) such that the
current does not exceed the limit value (ILIMIT). This is illustrated in Figure 13 based on the calculation shown in
Equation 5.
The soft limit is only active when in normal closed loop mode and does not result in a fault condition nor does it
result in the motor being stopped. The soft current limit is typically useful for limiting the current that results from
heavy loading during motor acceleration.
Figure 13. Current Limit
ULIMIT=ILIMIT × R_m + Speed × Kt
(5)
ILIMIT is configured by OTP setting (ILIMIT [2:0]) according to Table 7.
NOTE
The soft current limit calculation is not correct if the motor is out of phase with the
commutation control logic (locked rotor). The soft current limit will not be effective under
this condition.
Table 7. ILIMIT Settings
ILIMIT [2:0]
ILIMIT
0
No current limit
1
125 mA
2
250 mA
3
375 mA
4
500 mA
5
625 mA
6
750 mA
7
875 mA
7.3.7 Short Circuit Current Protection
The short circuit current protection function shuts off drive to the motor by placing the motor phases into a high
impedance state if the current in any motor phase exceeds the short circuit protection limit ISHT. The DRV10963
device will go through the initialization sequence and will attempt to restart the motor after the short circuit
condition is removed. This function is intended to protect the device and the motor from catastrophic failure when
subjected to a short circuit condition.
14
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