Page 1
KA3084D
2-Phase BLDC Motor Driver
www.fairchildsemi.com
Features
• Drives the BLDC motor using 2 hall sensors.
• 2-phase, full-wave drive method
• Built-in thermal shutdown (TSD) circuit
• Controls the motor speed through voltage
• Built-in bandgap circuit
• Built-in frequency Generator (FG) & Phase
Generator (PG) amplifier & comparato r.
Description
The KA3084D is a monolithic integrated circuit, and it is
suitable for drum motor driver of VCR system.
22-SOP-300
Target Applications
• Video cassette recorder(VCR) cylinder (drum) motor
• Other 2-phase BLDC motor
©2000 Fairchild Semiconductor International
Ordering Information
Device Package Operating Temp.
KA3084D 22-SOP-300 −25°C ~ +75°C
KA3084DTF 22-SOP-300 −25°C ~ +75°C
Rev. 1.0.1
February. 2000.
1
Page 2
Pin Assignments
KA3084D
FGOUT
25
FGAMPOUT
V
ERG
FGIN
V
PGIN
PGAMPOUT
PGOUT
CTL
V
H2N
H2P
121314151622 21 20 19 18 17
KA3084D
1234567891011
CC2
V
OUT2P
GND(Signal)
GND2(Power)
OUT2N
OUT1P
OUT1N
GND1(Power)
CC1
V
H1P
H1N
Pin Definitions
Pine Number Pin Name I/O Pin Function Description
1 GND (Signal) - Ground (Signal)
2V
CC2
3 OUT2P O Output drive 2(P)
4 GND2 (Power) - Power ground 2
5 OUT2N O Output drive 2(N)
6 OUT1P O Power supply 1(P)
7 GND1 (Power) - Power ground 1
8 OUT1N O Output drive 1(N)
9V
CC1
10 H1P I Hall signal input 1P
11 H1N I Hall signal input 1N
12 H2P I Hall signal input 2P
13 H2N I Hall signal input 2N
14 V
CTL
15 PGOUT O Phase generator output
16 PGAMPOUT O Phase generator amp. output
17 PGIN I Phase generator input
18 V
REG
19 FGIN I Frequency generator input
20 V
25
21 FGAMPOUT O Frequency generator amp. output
22 FGOUT O Frequency generator output
- Power supply 2
- Power supply 1
I Voltage control (Motor speed control)
O Regurated voltage
I/O Reference voltage
2
Page 3
KA3084D
Internal Block Diagram
FGOUT
FGAMPOUT
25
V
FGIN
REG
V
PGIN
PGAMPOUT
PGOUT
CTL
V
H2N
H2P
1214 131517 1618192022 21
25
HYS.
COM
V
DRIVER
REG
V
Supply each block
−
+
AMP
−
+
AMP
(5.0V)
TSD
DRIVER
CTL
I
HYS.
COM
CTL
V
Current/Voltage
Control
±
GM
GM
±
−
+
AMP
AMP
+
−
12 34567 8 91011
CC2
V
GND(Signal)
OUT2P
OUT2N
GND2(Signal)
OUT1P
OUT1N
GND1(Power)
CC1
V
H1P
H1N
3
Page 4
Equivalent Circuits
Description Pin No. Internal circuit
V
CTL
Motor output 3, 5, 6, 8
14
V
REG
50
14
V
CC
1k
I
CTL
KA3084D
Hall input 10, 11, 12, 13
V
REG
3
6
50
10
12
500
I
CTL
Vcc
5
8
500
50
11
13
4
Page 5
KA3084D
Equivalent Circuits (Continued)
Description Pin No. Internal circuit
PG, FG
amplifier
16, 17
19, 21
V
REG
PG, FG
hysteresis
amplifier
3, 5, 6, 8
10K
V
CC
50
16
21
V
CC
50
15
22
V
CC
50
17
19
V
REG
50
16
21
1k
V
CC
V
25
V
REG
V
25
5
Page 6
Absolute Maximum Ratings (Ta=25°°°°C)
Parameter Symbol Value Unit Remark
Supply voltage V
Maxium output current I
output current I
V
REG
Power dissipation P
Operating temperature T
Storage temperature T
Notes:
1. Duty 1 / 100, pulse wid th 50 0µs
2. 1) When mounted on glass epoxy PCB (76.2 × 114 × 1.57mm)
2) Power dissipation reduces 8.0mW /
3) Do not exceed Pd and SOA(Safe Operating Area).
CCmax
Omax
REGmax
d
OPR
STG
°C for using above Ta=25°C. (Without heat-sink)
18 V -
note1
1.0
A-
30 mA -
note2
1
W No heat sink
−25 ~ +75 °C-
−45 ~ +125 °C-
Power Dissipation Curve
Pd (mW)
2, 000
KA3084D
SOA
0
0 25 50 75 100 125
Recommended Operating Conditions (Ta = 25
Parameter Symbol Min. Typ. Max Units
Operating supply voltage V
CC
81216V
150 175
Ambient temperature, Ta [°C]
o
C)
6
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KA3084D
Electrical Characteristics
(Ta=25°C, VCC=12V, unless otherwise specified)
Parameter Symbol Condition Min. Typ. Max. Units
FULL CIRCUIT
Quiescent current I
VOLTAGE REGULATOR
Regulated voltage V
Regulated voltage V
HALL INPUT
Hall minimum input level
note
Hall bias current I
OUTPUT DIRVE
Output saturation voltage (Upper) V
Output saturation voltage (Lower) V
Output current A I
Output current B I
VOLTAGE CONTROL
reference voltage
V
CTL
V
input range
CTL
offset range V
V
CTL
input bias current I
V
CTL
note
note
Voltage control gain G
Q
REG
REG
V
INH
BH
SU
SL
OUTA
OUTB
V
25
V
CTL
OFF
VCTL
M
VCC=12V - 8.5 13 mA
VCC=12V 4.6 5.0 5.4 V
VCC=12V, I
=−20mA 4.6 5.0 5.4 V
REG
-50--mVp-p
V
=2.0V, Hall=2.5V - 0.25 2.0 µA
CTL
V
=4.5V - 1.3 2.0 V
CTL
V
=4.5V - 2.0 2.0 V
CTL
V
=2.6V
H1P
V
=2.4V, V
H1N
V
=2.6V
H2P
V
=2.4V, V
H2N
0.48 × V
REG
CTL
CTL
=3.5V
=2.5V
-0-V
V
=0 ~ V
V
V
∆I
V
V
CTL
CTL
CTL
O
H1P
H1N
/ ∆V
CTL
=2.5V - 1.0 6.0 µA
=2.8V, 3.3V
CTL
=2.6V,
=2.4V
500 700 900 mA
500 700 900 mA
2.0 2.3 2.5 V
REG
V
−150 0 +150 mV
0.38 0.55 0.64 A / V
I
O
0.55A/V(TYP)
0.48 × V
Notes:
The note in the chart means items calculated and approved in design not the items proven by actual test result.
(TYP) V
REG
CTL
7
Page 8
Electrical Characteristics (Continued)
(Ta=25°C, VCC=12V, unless otherwise specified)
Parameter Symbol Condition Min. Typ. Max. Units
FULL CIRCUIT
Shutdown temperature
Temperature hysteresis
FG / PG AMP
Input offset voltage V
Input current I
Open loop gain
note
Output high voltage V
Output low voltage V
COMPARATOR (HYSTERESIS)
Hysteresis level V
Output low voltage V
Output pull-up resistance V
note
note
TSD - 130 160 - °C
T
HYS
OFS
AMPIN
G
OHA
OLA
HYS
OLHYS
BHYS
VIN=2.5V - 0.2 2.0 µA
VCC=12V, Signal=500Hz 65 70 - dB
A
VIN=2.0V V
VIN=2.7 - 0.85 1.45 V
VIN=2.0V - 0.12 0.32 V
KA3084D
--30-°C
--0± 8mV
REG
−−−−1.48
V
REG
−−−−0.74
-V
- ±130 ±165 ±200 mV
- 7.0 10 13 kΩ
Notes:
The note in the chart means items calculated and approved in design not the items proven by actual test result.
8
Page 9
KA3084D
Application Informations
1. A DIAGRAM SUMMARIZING THE ENTIRE SYSTEM
I
V
TSD
C
AMP. DRIVE
4I
REG
HALL+
HALL−
V
CTL
Hall_IN
V / I
Converter
I
C
I
4I
C
C
2I
C
I
f
G
M
O
R2
FG_OUT
PG_OUT
FG_IN
PG_IN
R1
AMP &
COMP
AMP &
COMP
Figure 1.
Figure 1 is a conceptual d iagram of the KA3084D. It shows that it turns on or off depen ding on the signal of the hall sensor
used for sensing the rotor position of motor.
The AMP, G
(Feedback) and output blocks are circuits used to determine current gain of KA3084D.
M
Furthermore, HallIN represents the hall signal switch.
It supplies stable bias to each V
block. The TSD block is a thermal shutdown circuit that protects the IC during an high
REG
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
current drives the motor and the Ic current controls the motor speed.
O
vs. IO.
CTL
9
Page 10
I
CTL
I
Omax
KA3084D
I
O
A
T
Figure 2.
I
O
A
T
I
COmax
Figure 3.
3. VOLTAGE CONTROL
Even though KA3084D command uses Ic to control the magnitude of I
age control and has option to use current control.
I
V
CTL
V / I
Converter
CTL I
Figure 4.
Figure 4 shows the principle of the voltage control.
The V
is the motor speed control voltage, and the I
CTL
Figure 5 shows the graph of V
CTL
vs. IO.
is converted to current through the V / I converter.
CTL
I
CTL
, it can also use voltage. KA3084D mainly uses volt-
O
A
T
O
I
Omax
I
O
A
0.48 × V
T
REG
(TYP)
G
M
V
CTL
Figure 5.
10
Page 11
KA3084D
Typical Performance Characteristics
5.0
4.0
(V)
3.0
REG
V
2.0
1.0
0.0
0 2 4 6 8 101214161820
V
(V)
CC
1.VCC vs V
12
10
8
(mA)
6
CC
I
4
2
0
8 1012141618
(V)
V
CC
3.VCC vs I
CC
V
REG
V
CTL
V
CTL
RL = 10KΩ
RL = 10 KΩ
= 0V
CTL
= 3.5V
= 3.5V
5
4
(V)
3
REG
V
2
V
= 0V
1
0
-30-20-10 0 10 20 30 40 50 60 70 80 90
Temperature(°C)
Temperature(℃)
2.Temp. vs V
0.63
0.58
0.53
0.48
GM1(A/V)
0.43
0.38
8 1012141618
(V)
V
CC
V
REG
CTL
CC
V
= 12V
CTL
= 3.5V
4.VCC vs GM1
900
850
800
750
700
(mA)
O
I
650
V
600
550
500
8 1012141618
VCC(V)
5.V
vs IOA
CC
= 3.5V
CTL
V
= 3.5V
CTL
RL = 10KΩ
RL = 10KΩ
11
900
850
800
750
700
(mA)
O
I
650
600
550
500
8 1012141618
(V)
V
CC
6.V
CC
V
RL = 10KΩ
vs IOB
= 3.5V
CTL
V
= 3.5V
CTL
RL = 10KΩ
Page 12
Test Circuits
SW24
KA3084D
2mA
3
2
1
A
FG_OUT
1
GND (Signal)
V
CC
I
CC
1
2
10Ω(20W)
1
2
1
2
SW1
SW2
SW3
2
3
4
5
6
V
CC2
OUT2P
GND2(Power)
OUT2N
OUT1P
FGOUT
FGAMPOUT
K
A
3
0
8
4
D
10Ω(20W)
1
2
SW4
7
8
9
GND1(Power)
OUT1N
V
CC1
PGAMPOUT
PGOUT
V
FGIN
V
REG
PGIN
V
CTL
22
SW22
21
25
20
SW19
19
SW18
18
17
16
SW17
15
14
2
1
2
1
SW13
SW15
SW23
3
2
1
I
REG
1
2
3
V
CTL
1
2
2
1
=−20µA
1
2
3
SW16
A
PG_OUT
2mA
500µA
FG_AMPOUT
SW21
2
SW20
1
V
REG
1
−500µA
2
−500µA
−500µA
V
2
1
~
FG_IN
SW14
1
2
PG_AMPOUT
25
PG_IN
V
HALL_1P
V
HALL_1N
SW7
+
−
SW8
~
1
SW5
2
1
SW6
2
H1P
10
H1N
11 12
H2N
H2P
SW10
13
SW9
1
2
1
2
SW12
SW11
V
HALL_2N
V
HALL_2P
−
+
~
12
Page 13
KA3084D
Typical Application Circuits
V
M
REG
1
2
3
4
5
6
7
8
GND(Signal)
V
CC2
OUT2P
GND2(Power)
OUT2N
OUT1P
GND1(Power)
OUT1N
FGAMPOUT
K
A
3
0
8
4
D
PGAMPOUT
FGOUT
V
FGIN
V
REG
PG_IN
PGOUT
22
21
25
20
19
18
PG
17
16
15
HALL
HALL
V
CC1
9
H1P
10
H1N
11
V
H2N
CTL
H2P
V
14
13
12
CTL
13
Page 14
KA3084D
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURT HER NOTICE TO ANY
PRODUCTS HEREI N TO IMPROVE RELIABILITY, FUNCTIO N OR DESIGN. FAIRCH IL D DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER IT S PATENT RIGHTS, NOR THE RIGHTS OF OTHE RS.
LIFE SUPPORT POL I CY
FAIRCHILD’S PR ODUCTS ARE NOT AUTH ORIZED FOR USE AS C RITICAL COMPONENT S IN LIFE SUPPORT DE VICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
INTERNATIONAL. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
2. A critical component in any component of a life support
device or sy stem whose fai lure to perform can be
reasonably expec ted to cause the failur e of the life support
device or system, or to affect its safety or effec t iv ene ss .
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
www.fairchildsemi.com
12/1/00 0.0m 001
2000 Fairchild Semiconductor International
Stock#DSxxxxxxxx
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