DRV8302 Datasheet, PDF (14/21 Pages) Texas Instruments – Three Phase Pre-Driver with Dual Current Shunt Amplifiers and Buck Regulator – Hardware Controlled

DRV8302
SLES267 – AUGUST 2011
R1 + R2 ≥ 100 KΩ
DVDD = 3.3 V
Connect OC_ADJ pin to DVDD to disable the over-current protection feature.
DVDD
R1
V_OC
OC_ADJ
R2
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Figure 3. OC_ADJ Current Programming Pin Connection
Under-Voltage Protection (UVP)
To protect the power output stage during startup, shutdown and other possible under-voltage conditions, the
DRV8302 provides power stage under-voltage protection by driving its outputs low whenever PVDD is below 6V
(PVDD_UV) or GVDD is below 8V (GVDD_UV). When UVP is triggered, the DRV8302 outputs are driven low
and the external MOSFETs will go to a high impedance state.
Over-Voltage Protection (GVDD_OV)
Device will shut down both gate driver and charge pump if GVDD voltage exceeds 16V to prevent potential issue
related to GVDD or charge pump (e.g. short of external GVDD cap or charge pump). The fault is a latched fault
and can only be reset through a transition on EN_GATE pin.
Over-Temperature Protection
A two-level over-temperature detection circuit is implemented:
• Level 1: over temperature warning (OTW)
OTW is reported through OCTW pin.
• Level 2: over temperature (OT) latched shut down of gate driver and charge pump (OTSD_GATE)
Fault will be reported to FAULT pin. This is a latched shut down, so gate driver will not be recovered
automatically even if OT condition is not present anymore. An EN_GATE reset through pin is required to
recover gate driver to normal operation after temperature goes below a preset value, t_{OTSD_CLR}.
Fault and Protection Handling
The FAULT pin indicates an error event with shut down has occurred such as over-current, over-temperature,
over-voltage, or under-voltage. Note that FAULT is an open-drain signal. FAULT will go high when gate driver is
ready for PWM signal (internal EN_GATE goes high) during start up.
The OCTW pin indicates an over temperature or over current event that is not necessarily related to shut down.
Following is the summary of all protection features and their reporting structure:
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