DRV10866 Datasheet, PDF (7/14 Pages) Texas Instruments – 5-V, THREE-PHASE, SENSORLESS BLDC MOTOR DRIVER

DRV10866
www.ti.com
SBVS206 – NOVEMBER 2012
Voltage Surge Protection
The DRV10866 has a unique feature to clamp the V_CC voltage during lock protection and standby mode. If the
lock mode condition is caused by an external force that suddenly stops the motor at a high speed, or the device
goes into standby mode from a high duty cycle, either situation releases the energy in the motor winding into the
input capacitor. When a small input capacitor and anti-reverse diode are used in the system design, the input
voltage of the IC could rise above the absolute voltage rate of the chip. This condition either destroys the device
or reduces the reliability of the device. For this reason, the DRV10866 has a voltage clamp circuit that clamps the
input voltage at 5.95 V, and has a hysteresis of 150 mV. This clamp circuit is only active during the lock
protection cycle or when the device enters standby mode. It is disabled during normal operation.
Overcurrent Protection
The DRV10866 can adjust the overcurrent point through an external resistor connected to the CS pin (pin 9) and
ground. Without this external current sense resistor, the DRV10866 senses the current through the power
MOSFET. Therefore, there is no power loss during the current sensing. The current sense architecture improves
the overall system efficiency. Shorting the CS pin to ground disables the overcurrent protection feature. During
overcurrent protection, the DRV10866 only limits the current to the motor; it does not shut down the device. The
overcurrent limit can be set by the value of current sensing resistor through Equation 2.
I (A) = ³¹²⁰
R_CS (W)
(2)
UVLO (Undervoltage Lockout)
The DRV10866 has a built in UVLO function block. The hysteresis of UVLO threshold is 150 mV. The device will
be locked out when V_CC reaches 1.65 V and woke up at 1.8 V.
Thermal Shutdown
The DRV10866 has a built in thermal shunt down function, which will shut down the device when the junction
temperature is over 160°C and will resume operating when the junction temperature drops back to 150°C.
Copyright © 2012, Texas Instruments Incorporated
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