DRV8307_15 Datasheet, PDF (10/34 Pages) Texas Instruments – DRV8307 Brushless DC Motor Controller

DRV8307
SLVSCK2 – APRIL 2014
8.2 Functional Block Diagram
VM
VM
CP1
0.1 µF
CP2
VM
VCP
1 µF
1 µF
VINT
0.1 µF
VREG
VSW
GND
PPAD
Power
Charge
Pump
VCP
1.8-V Linear
Regulator
5-V Linear
Regulator
ENABLE#
10 V _{10-V Linear}
Regulator
VCP
Phase U
pre-driver
10 V
VCP
Phase V
pre-driver
10 V
VCP
Phase W
pre-driver
10 V
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UHSG
U
ULSG
VHSG
V
VLSG
WHSG
W
WLSG
VM
bulk
VSW or VREG
VM
VM
Hall
Power
Hall Hall Hall
U
V
W
PWM
DIR
BRAKE
ENABLEn
HALLOUT
LOCKn
FAULTn
Control
Inputs
Outputs
Core
Logic
Voltage
Monitoring
Thermal
Sensor
Oscillator
-
PWM
Limiter
+
VLIMITER
-
SENSE
OCP
+
VSENSEOCP
Hall
Differential
Comparators
+
-
+
-
+
-
ISEN
HU+
HU±
HV+
HV±
HW+
HW±
RISENSE
Optional
Optional
Optional
8.3 Feature Description
8.3.1 Hall Comparators
Three comparators are provided to process the raw signals from Hall effect transducers to commutate the motor.
The Hall amplifiers sense zero crossings of the differential inputs and pass the information to digital logic.
The Hall amplifiers have hysteresis, and their detect threshold is centered at 0. Note, hysteresis is defined as
shown in Figure 3:
10
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