DRV3201-Q1_16 Datasheet, PDF (18/60 Pages) Texas Instruments – DRV3201-Q1 3 Phase Motor Driver-IC for Automotive Safety Applications

DRV3201-Q1
SLVSBD6D – MAY 2012 – REVISED AUGUST 2015
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Feature Description (continued)
7.3.5 Diagnostics and Protection
The DRV3201-Q1 has a wide range of features that help to grant the application a high safety level.
7.3.5.1 Monitored Errors
The following sections describe the monitored errors. The handling of these errors is described in the
Configurable Safety Mode section.
7.3.5.1.1 Drain Source Voltage Monitoring
The DRV3201-Q1 provides a drain-source voltage monitoring feature for each external power MOSFET. After
input pin IHSx/ILSx goes high to turn on the external power MOSFET, its drain-source voltage is monitored. If
this voltage stays higher than the VDS threshold for filter-time (t_vds) then the error is raised and the status flag for
this power MOSFET is set.
The internal VDS threshold for the VDS monitoring can be set by an external analog input level on the SCTH pin,
and can be scaled in eight steps with a factor between 0 and 1 through SPI in configuration register 0 (CFG0),
bits 5:3.
The VDS comparator configuration for each gate-driver is shown in Figure 4. As shown in Figure 4, the VSH pin
is used as sense input voltage for the high-side VDS comparators. Externally, this VSH pin should be connected
to the star-point of the positive supply of the power-stages.
DRV3201
SCTH × Scale
High-Side VDSx Comp
Low-Side VDSx Comp
VSH
GHSx
SHSx
GLSx
Battery Voltage
BLDC
I_Phase
SCTH × Scale
SLSx
PGND
Rshunt
Figure 4. VDS Comparator Configuration for Each Driver-Stage
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