DRV8811_11 Datasheet, PDF (13/22 Pages) Texas Instruments – STEPPER MOTOR CONTROLLER IC

DRV8811
www.ti.com
SLVS865G – SEPTEMBER 2008 – REVISED MAY 2010
Protection Circuits
Overcurrent Protection (OCP)
If the current through any FET exceeds the preset overcurrent threshold, all FETs in the H-bridge will be disabled
until the ENABLEn pin has been brought inactive high and then back low, or power is removed and re-applied.
Overcurrent conditions are sensed in both directions; i.e., a short to ground, supply, or across the motor winding
will all result in an overcurrent shutdown.
Note that overcurrent protection does not use the current sense circuitry used for PWM current control and is
independent of the Isense resistor value or VREF voltage.
Thermal Shutdown (TSD)
If the die temperature exceeds safe limits, all drivers in the device are shut down and the indexer is reset to the
home state. Once the die temperature has fallen to a safe level operation resumes.
Undervoltage Lockout (UVLO)
If at any time the voltage on the VM pins falls below the undervoltage lockout threshold voltage, all circuitry in the
device is disabled and the indexer is reset to the home state. Operation resumes when VM rises above the
UVLO threshold.
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