DRV3201-Q1_16 Datasheet, PDF (25/60 Pages) Texas Instruments – DRV3201-Q1 3 Phase Motor Driver-IC for Automotive Safety Applications

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DRV3201-Q1
SLVSBD6D – MAY 2012 – REVISED AUGUST 2015
7.3.6 Phase Comparators
The device contains three real time phase comparators usable for sensorless commutation and diagnostics.
Each comparator is switching at typically 75% and 25% of the supply voltage, and has an individual digital output
going to the MCU. The phase comparators are always active as long as EN is high.
SHSx
(Phase Voltage)
75% VSH
25% VSH
PHxC
(Phase Comparator Output)
tDHL
tDLH
Figure 9. Phase Comparator Rise and Fall Thresholds
7.3.6.1 Phase Comparators Application Diagram
The phase comparator configuration is given in Figure 10.
DRV3201
VSH
Battery Voltage
To MCU
PHxC
GHSx
0.75
SHSx
GLSx
0.25
SLSx
PGND
BLDC
RShunt
Figure 10. Application Diagram for Phase Comparators
The phase comparators allow:
• Real time observation of the phase switching on node SHSx
• Measurement of the time between the Input IHSx/ILSx and the phase comparator output PHxC
• Verification of time drift in previous measurements and/or other driver-stages
As Figure 10 shows, the VSH and PGND pins are used as sense inputs to create the high-side and low-side
threshold levels for the phase comparators. Connect the VSH pin externally to the star-point of the positive
supply of the power-stages. The PGND pin is to be connected to the power-ground star-point of the power-
stages. The total resistance of the internal voltage divider is typically 248 kΩ.
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