KA3084D Fairchild Semiconductor, KA3084D Datasheet - Page 9

• Manufacturer Part Number: KA3084D
• Description: Motor / Motion / Ignition Controllers & Drivers BLDC Motor Driver 2-Phase
• Manufacturer: Fairchild Semiconductor
• Type: 2 Phase BLDC Motor Driverr

Specifications of KA3084D

• Operating Supply Voltage: 12 V
• Mounting Style: SMD/SMT
• Package / Case: SOP-22
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

KA3084D
Application Informations
1. A DIAGRAM SUMMARIZING THE ENTIRE SYSTEM
Figure 1 is a conceptual diagram of the KA3084D. It shows that it turns on or off depending on the signal of the hall sensor
used for sensing 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
HALL
HALL+
V
CTL
M
O
(Feedback) and output blocks are circuits used to determine current gain of KA3084D.
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
9
4I
C
G
M
I
f
2I
C
AMP &
COMP
AMP &
COMP
DRIVE
R2
FG_OUT
PG_OUT
I
O