DRV595 Datasheet, PDF (14/24 Pages) Texas Instruments – 15V/±3A High-Efficiency PWM Power Driver

DRV595
SLOS808 – DECEMBER 2012
www.ti.com
DEVICE PROTECTION SYSTEM
The DRV595 contains a complete set of protection circuits carefully designed to make system design efficient as
well as to protect the device against permanent failures due to short circuits, overload, over temperature, and
under-voltage. The FAULTZ pin will signal if an error is detected according to the fault table below:
FAULT
Over Current
Over Temperature
Under Voltage on
PVCC
Over Voltage on
PVCC
Table 3. Fault Reporting
TRIGGERING CONDITION
(typical value)
Output short or short to PVCC or GND
T_j > 150°C
FAULTZ
Low
Low
ACTION
Output high impedance
Output high impedance
PVCC < 4.5V
–
Output high impedance
PVCC > 27V
–
Output high impedance
LATCHED/SELF-
CLEARING
Latched
Latched
Self-clearing
Self-clearing
SHORT-CIRCUIT PROTECTION AND AUTOMATIC RECOVERY FEATURE
The DRV595 has protection from over current conditions caused by a short circuit on the output stage. The short
circuit protection fault is reported on the FAULTZ pin as a low state. The amplifier outputs are switched to a high
impedance state when the short circuit protection latch is engaged. The latch can be cleared by cycling the SDZ
pin through the low state.
If automatic recovery from the short circuit protection latch is desired, connect the FAULTZ pin directly to the
SDZ pin. This allows the FAULTZ pin function to automatically drive the SDZ pin low which clears the short-
circuit protection latch.
SDZ
> 1.4sec
mP
Hi-Z
FAULTZ
DRV595
SDZ
Hi-Z
FAULTZ
Figure 15. Timing Requirement for SDZ
THERMAL PROTECTION
Thermal protection on the DRV595 prevents damage to the device when the internal die temperature exceeds
150°C. There is a ±15°C tolerance on this trip point from device to device. Once the die temperature exceeds the
thermal trip point, the device enters into the shutdown state and the outputs are disabled. This is a latched fault.
Thermal protection faults are reported on the FAULTZ terminal as a low state.
If automatic recovery from the thermal protection latch is desired, connect the FAULTZ pin directly to the SDZ
pin. This allows the FAULTZ pin function to automatically drive the SDZ pin low which clears the thermal
protection latch.
DRV595 MODULATION SCHEME
The DRV595 has the option of running in either BD modulation or 1SPW modulation; this is set by the MODSEL
pin.
MODSEL = GND: BD-modulation
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