DRV8320_17 Datasheet, PDF (45/89 Pages) Texas Instruments – 6 to 60-V Three-Phase Smart Gate Driver

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DRV8320, DRV8320R
DRV8323, DRV8323R
SLVSDJ3A – FEBRUARY 2017 – REVISED APRIL 2017
8.3.5.6 Overvoltage Transient Protection
The LMR16006 device incorporates an overvoltage transient protection (OVTP) circuit to minimize voltage
overshoot when recovering from output fault conditions or strong unload transients on power supply designs with
low-value output capacitance. For example, when the power supply output is overloaded, the error amplifier
compares the actual output voltage to the internal reference voltage. If the voltage of the FB pin is lower than the
internal reference voltage for a considerable time, the output of the error amplifier responds by clamping the error
amplifier output to a high voltage, therefore requesting the maximum output current. When the condition is
removed, the regulator output rises and the error amplifier output transitions to the steady-state duty cycle. In
some applications, the power-supply output voltage can respond faster than the error amplifier output can
respond which leads to the possibility of an output overshoot. The OVTP feature minimizes the output overshoot
when using a low-value output capacitor by implementing a circuit to compare the FB pin voltage to the OVTP
threshold which is 108% of the internal voltage reference. If the FB pin voltage is greater than the OVTP
threshold, the high-side MOSFET is disabled preventing current from flowing to the output and minimizing output
overshoot. When the FB voltage drops lower than the OVTP threshold, the high-side MOSFET is allowed to turn
on at the next clock cycle.
8.3.5.7 Thermal Shutdown
The device implements an internal thermal shutdown to help protect the device if the junction temperature
exceeds 170°C (typical). The thermal shutdown forces the device to stop switching when the junction
temperature exceeds the thermal trip threshold. When the junction temperature decreases below 160°C (typical),
the device reinitiates the power up sequence.
8.3.6 Gate-Driver Protective Circuits
The DRV832x family of devices is fully protected against VM undervoltage, charge pump undervoltage, MOSFET
V_DS overcurrent, gate driver shorts, and overtemperature events.
FAULT
VM
undervoltage
(UVLO)
Charge pump
undervoltage
(CPUV)
V_DS overcurrent
(VDS_OCP)
CONDITION
V_VM < V_UVLO
V_VCP < V_CPUV
V_DS > V_{VDS_OCP}
V_SENSE
overcurrent
(SEN_OCP)
V_SP > V_{SEN_OCP}
Gate driver fault
(GDF)
Gate voltage stuck > t_DRIVE
Thermal
warning
(OTW)
Thermal
shutdown
(OTSD)
T_J > T_OTW
T_J > T_OTSD
Table 8. Fault Action and Response
CONFIGURATION
REPORT
GATE DRIVER
LOGIC
—
nFAULT
Hi-Z
Disabled
DIS_CPUV = 0b
DIS_CPUV = 1b
OCP_MODE = 00b
nFAULT
None
nFAULT
Hi-Z
Active
Hi-Z
Active
Active
Active
OCP_MODE = 01b
OCP_MODE = 10b
OCP_MODE = 11b
OCP_MODE = 00b
nFAULT
nFAULT
None
nFAULT
Hi-Z
Active
Active
Hi-Z
Active
Active
Active
Active
OCP_MODE = 01b
OCP_MODE = 10b
OCP_MODE = 11b or
DIS_SEN = 1b
DIS_GDF = 0b
DIS_GDF = 1b
OTW_REP = 1b
OTW_REP = 0b
nFAULT
nFAULT
None
nFAULT
None
nFAULT
None
Hi-Z
Active
Active
Hi-Z
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
—
nFAULT
Hi-Z
Active
RECOVERY
Automatic:
V_VM > V_UVLO
Automatic:
V_VCP > V_CPUV
Latched:
CLR_FLT, ENABLE Pulse
Retry:
t_RETRY
No action
No action
Latched:
CLR_FLT, ENABLE Pulse
Retry:
t_RETRY
No action
No action
Latched:
CLR_FLT, ENABLE Pulse
No action
Automatic:
T_J < T_OTW – T_HYS
No action
Automatic:
T_J < T_OTSD – T_HYS
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