DRV3204-Q1_15 Datasheet, PDF (20/38 Pages) Texas Instruments – Three-Phase Brushless Motor Driver

DRV3204-Q1
SLVSBT3B – MARCH 2013 – REVISED JULY 2013
CTLUH
CTLVH
CTLWH
CTLUL
CTLVL
CTLWL
UH
VH
WH
th-ondly
80%
20%
th-on(th-ondly + ton)
th-offdly
80%
20%
th-off(th-offdly + toff)
UL
80%
VL
WL
20%
80%
20%
tl-offdly
tl-off(tl-offdly + toff)
tl-ondly
tl-on(tl-ondly + ton)
NOTE: This diagram excludes dead time to explain the timing parameters of the pre-driver.
Figure 12. Delay Time From Input to Output
CTLUH
CTLVH
CTLWH
CTLUL
CTLVL
CTLWL
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xHS
NGND
UH
VH
WH
tdead + th-ondly
UL
VL
WL
tl-offdly
tdead + tl-ondly
Figure 13. Dead Time
th-offdly
Phase Comparator
Description:
The three-channel comparator module monitors the external FETs by detecting the drain-source voltage across
the high-side and low-side FETs. PHTM is the threshold level of the comparators usable for sensorless
communication. Figure 14 shows an example of the threshold level.
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