DRV8801A-Q1 Datasheet, PDF (12/24 Pages) Texas Instruments – DMOS Full-Bridge Motor Drivers

DRV8801A-Q1
SLVSC79C – JUNE 2014 – REVISED JULY 2016
www.ti.com
7.3.8.2 Overcurrent Protection (OCP)
The current flowing through the high-side and low-side drivers is monitored to ensure that the motor lead is not
shorted to supply or ground. If a short is detected, all FETs in the H-bridge are disabled, nFAULT is driven low,
and a t_(OCP) fault timer is started. After this period, t_(OCP), the device is then allowed to follow the input commands
and another turn-on is attempted (nFAULT releases during this attempt). If there is still a fault condition, the cycle
repeats. If the short condition is not present after t_(OCP) expires, normal operation resumes and nFAULT is
released.
7.3.8.3 Overtemperature Warning (OTW)
If the die temperature increases past the thermal warning threshold the nFAULT pin is driven low. When the die
temperature has fallen below the hysteresis level, the nFAULT pin is released. If the die temperature continues to
increase, the device enters overtemperature shutdown as described in the Overtemperature Shutdown (OTS)
section.
7.3.8.4 Overtemperature Shutdown (OTS)
If the die temperature exceeds the thermal shutdown temperature, all FETs in the H-bridge are disabled and the
charge pump shuts down. The nFAULT pin remains pulled low during this fault condition. When the die
temperature falls below the hysteresis threshold, operation automatically resumes.
7.4 Device Functional Modes
The DRV8801A-Q1 device is active unless the nSLEEP pin is brought logic low. In sleep mode the charge pump
is disabled and the H-bridge FETs are disabled hi-Z. The DRV8801A-Q1 device is brought out of sleep mode
automatically if nSLEEP is brought logic high.
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