FAN8460MPX FAIRCHILD [Fairchild Semiconductor], FAN8460MPX Datasheet - Page 14

• Manufacturer Part Number: FAN8460MPX
• Description: Single Phase Full Wave BLDC Motor Driver with Variable Speed Control
• Manufacturer: FAIRCHILD [Fairchild Semiconductor]

FAN8460MTC/FAN8460MP
6. Hall Sensor Amplifier
The hall current (I
Where, RH is an external limiting resistor and Ri is input impedance of hall sensor. An external capacitor, C
reduce a power supply noise. C
amplifier is between 0V and V
Table 1. Hall Sensor Outputs and Related Pin outputs
7 Open Collector TACO Output for Speed Feedback
The TACO output comes from the hall amplifier output. Because the TACO output is open collector type, end user can pull up
this pin with a external resistor to the supply voltage of their choice (that is 5 or 3.3V). This resulting output signal has two
pulses per revolution on a four pole motor.
9 Supply Voltage Consideration
A supply sustain capacitor (C
diode (D
This results in increasing VM and VS pin voltage. This capacitor absorbs motor recirculating current and limits VM and VCC
pin voltage. In general, large motor winding inductance and current need large value of C
9. Thermal Shutdown
TSD on: Two high side output TR are off.(Typ. 175 C)
TSD off: The circuit can be reactivated and begin to operate in a normal condition. (Typ. 150 C)
14
I H
(H+) - ( H-)
Negative
Positive
=
-------------------------- -
-
R
R
) prevent motor current from recirculating to power source when PWM operation and phase commutation occur.
V CC
H
+
R
V S - 2 .8 V
i
H
Low Level
Low Level
) is determined as follows;
V S / 2
G N D
V S
LD
-
R)
CC
H2
should be placed as close to VM pin with GND as layout permits. A reverse supply protection
-2.8V as shown in following figure.
can reduce the instant peak current using H-bridge’s commutation. The input range of hall
OUT A
PWM
L
-
Figure 2. Hall Amplifier Input Range
FAN8460MTC
Figure 1. Hall Sensor Interface
FAN8460MP
OUT B
PWM
L
-
2
1
C
H2
H+
H-
AL
H
L
L
V +
RH
Ri
Sensor
C
Hall
H1
TACO
L or H
H
L
R.
ROTATING
Remark
LOCK
H1
, can be used to