ka3086d Fairchild Semiconductor, ka3086d Datasheet - Page 10

• Manufacturer Part Number: ka3086d
• Description: 2-phase Bldc Motor Driver
• Manufacturer: Fairchild Semiconductor

FAN8486D (KA3086D)
Application Informations
1. A Diagram Summarizing The Entire System
Figure 1 is a conceptual diagram of the FAN8486D. It turns on or off depending on the signal of the hall sensor used for sens-
ing the rotor position of motor.
The AMP, G
Furthermore, HallIN represents the hall signal switch.
It supplies stable bias to each V
temperature inside the IC.
Moreover, FG. and PG. blocks output individual signals generated in the motor using the amplifier and comparator.
These signals transmit motor speed and position data to controller of external servo etc. for their control.
2. Current Control
Figure 2 simplifies figure 1.
The supplied I
Figure 3 is a graph of I
10
HALL
HALL+
V
CTL
M
O
(Feedback) and output blocks are circuits used to determine current gain of FAN8486D.
current drives the motor and the Ic current controls the motor speed.
CTL
vs. I
Converter
Hall_IN
V / I
REG
O
.
I
C
block. The TSD block is a thermal shutdown circuit that protects the IC during an high
V
TSD
REG
I
C
AMP.
PG_IN
FG_IN
Figure 1.
R1
4I
C
February. 2000.
4I
Rev. 1.0.1
C
G
M
I
f
2I
C
AMP &
COMP
AMP &
COMP
DRIVER
R2
FG_OUT
PG_OUT
I
O