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DRV10987: behavior after over current protection.

user5945607
Prodigy 170 points
Part Number: DRV10987
Other Parts Discussed in Thread: DRV10983,

Hello,

the explanation about over current protection in drv10983's datasheet as below;

8.3.2.3 Overcurrent Protection (OCP)
The overcurrent protection function acts to protect the device if the current, as measured from the FETs, exceeds
the IOC-limit threshold. It protects the device from phase-to-phase short-circuit conditions; the DRV10983 places
the output drivers into a high-impedance state and maintains this condition until the overcurrent is no longer
present.

the explanation about over current protection in drv10987's datasheet as below;

8.3.2.3 Overcurrent Protection (OCP)
The overcurrent protection function acts to protect the device if the current, as measured from the FETs, exceeds
the IOC-limit threshold. The overcurrent protection function protects the device in the event of a short-circuit
condition on the motor phases. A short-circuit condition includes phase shorts to GND, phase shorts to phase, or
phase shorts to VCC. The DRV10987 device places the output drivers into a high-impedance state until the lock
time tLOCK_OFF has expired. The OverCurr status bit of the FaultReg register (address 0x00, bit 11) is set.

Q1.Is the behavior difference between DRV10983 and DRV10987??

Q2. If the current exceeds IOC-limit threshold,The devices places the output drivers into a high-impedance state and maintains this condition until the overcurrent is no longer present.

      Does it mean that the device return automatically to normal state from a high-impedance state when the current fell down than IOC-limit threshold?

  • 0
    TI__Expert 6065 points
    1) The differences between DRV10987 and DRV10983 in overcurrent protection are:
    a1) DRV10983 seems to do phase-to-phase short-circuit conditions
    a2) DRV10987 does phase to GND, phase to phase, and phase to VCC shorts.

    b1) the DRV10983 places the output drivers into a high-impedance state ... until the overcurrent condition is no longer
    present
    b2) The DRV10987 device places the output drivers into a high-impedance state until the lock time tLOCK_OFF has expired.

    2) For DRV10983, after overcurrent is no longer present, the device restarts the spinning the motor process (IPD/Align, Open Loop, Closed Loop, or ISD to Closed Loop).
    For DRV10987, after tLOCK_OFF has expired, the device restarts the spinning the motor process (IPD/Align, Open Loop, Closed Loop, or ISD to Closed Loop).

    Let me know if this answered your question or not. If it did, please press the resolved button.