DRV8837_15 Datasheet, PDF (11/24 Pages) Texas Instruments – Low-Voltage H-Bridge Driver

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DRV8837, DRV8838
SLVSBA4D – JUNE 2012 – REVISED DECEMBER 2015
7.3.4.2 Overcurrent Protection (OCP)
An analog current-limit circuit on each FET limits the current through the FET by removing the gate drive. If this
analog current limit persists for longer than t_DEG, all FETs in the H-bridge are disabled. Operation resumes
automatically after t_RETRY has elapsed. Overcurrent conditions are detected on both the high-side and low-side
FETs. A short to the VM pin, GND, or from the OUT1 pin to the OUT2 pin results in an overcurrent condition.
7.3.4.3 Thermal Shutdown (TSD)
If the die temperature exceeds safe limits, all FETs in the H-bridge are disabled. After the die temperature falls to
a safe level, operation automatically resumes.
FAULT
VCC undervoltage (UVLO)
Overcurrent (OCP)
Thermal Shutdown (TSD)
Table 3. Fault Behavior
CONDITION
VCC < 1.7 V
I_OUT > 1.9 A (MIN)
T_J > 150°C (MIN)
H-BRIDGE
Disabled
Disabled
Disabled
RECOVERY
VCC > 1.8 V
t_RETRY elapses
T_J < 150°C
7.4 Device Functional Modes
The DRV883x family of devices is active unless the nSLEEP pin is brought logic low. In sleep mode, the H-
bridge FETs are disabled Hi-Z. The DRV883x is brought out of sleep mode automatically if nSLEEP is brought
logic high.
The H-bridge outputs are disabled during undervoltage lockout, overcurrent, and overtemperature fault
conditions.
MODE
Operating
Sleep mode
Fault encountered
Table 4. Operation Modes
CONDITION
nSLEEP pin = 1
nSLEEP pin = 0
Any fault condition met
H-BRIDGE
Operating
Disabled
Disabled
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