ICs for Motor
AN8481SB
Spindle motor driver IC for optical disk
s
Overview
The AN8481SB is a high performance IC suited
for driving a spindle motor of an optical disk such
as CD-ROM, PD, DVD, CD-R, CD-RW, etc.
18.4±0.2
(5.15)
(4.8)
28
22
21
15
(1.315)
8.3±0.2
0.30
–0.05
+0.10
Unit: mm
s
Features
•
Adopting the 3-phase full-wave soft switch sys-
tem
•
With switching regulator control function
•
With start and stop pin
•
Reverse breaking by EC/ECR voltage
•
With Hall bias pin
•
Surface-mount small package
10.93±0.30
0° to 10°
1
7
8
14
0.65±0.20
2.7±0.2
(1.2)
0.8
(6.4)
0.35
–0.05
+0.10
Seating plane
s
Applications
•
High speed CD-ROM drive
•
PD, DVD, CD-R, CD-RW drives
HSOP042-P-0400
0.1±0.1
1
AN8481SB
s
Block Diagram
CS1
VM
FG
ICs for Motor
20
22
27
26
25
9
FG
comparator
REF
21
Thermal
protection
circuit
VTL
13
V
CC
PCI
V
REG
19
Lower
side
V
CE
detection
Amp.
Amp.
Upper side
distribution
Lower side
distribution
PCS
SWB
18
Direction changeover
17
Amp.
Direction
detection
16
ER
Logic
EP
=
ER
×
EA
Start/stop
Absolute
value
28
PG
A1
A2
A3
12
SWG
Triangular
wave
Detection
Hall
bias
Hall amp. matrix
EA
8
S/S
15
11
EC
FC
VH
s
Pin Descriptions
Pin No. Symbol
1
2
3
4
5
6
7
8
9
10
2
H1+
H1−
H2+
H2−
H3+
H3−
VH
SS
FG
ECR
Description
Hall element-1 positive input pin
Hall element-1 negative input pin
Hall element-2 positive input pin
Hall element-2 negative input pin
Hall element-3 positive input pin
Hall element-3 negative input pin
Hall bias pin
Start/stop changeover pin
FG signal output pin
Torque command reference input pin
Pin No. Symbol
11
12
13
14
15
16
17
18
19
20
EC
PCI
V
CC
SG
FC
SWG
SWB
PCS
V
REG
VM
Description
Torque command input pin
Current feedback phase compensation pin
Supply voltage pin
Signal GND pin
Triangular wave oscillation pin
SW-REG system GND pin
SW-REG driving pin
SW-REG system phase compensation pin
Fixed power supply pin
Motor supply voltage pin
ECR
H1+
H1−
H2+
H2−
H3+
H3−
10
GND
14
1
2
3
4
5
6
7
ICs for Motor
s
Pin Descriptions (continued)
Pin No. Symbol
21
22
23
24
REF
CS1
N.C.
N.C.
Description
SW-REG reference setting pin
Current det. pin 1
N.C.
N.C.
Pin No. Symbol
25
26
27
28
A3
A2
A1
PG
AN8481SB
Description
Drive output 3
Drive output 2
Drive output 1
Power GND pin
s
Absolute Maximum Ratings
Parameter
Supply voltage
Symbol
V
CC
V
M
V
REG
Control signal input voltage
*4
Supply current
Output current
*3
Hall bias current
Power dissipation
*2
Operating ambient temperature
*1
Storage temperature
*1
V
(n)
I
CC
I
O(n)
I
HB
P
D
T
opr
T
stg
0 to V
CC
30
±1
200
50
667
−20
to
+70
−55
to
+150
V
mA
mA
mA
mW
°C
°C
Rating
7.0
14.4
Unit
V
Note) Do not apply external currents or voltages to any pins not specifically mentioned.
For circuit currents, '+' denotes current flowing into the IC, and '−' denotes current flowing out of the IC.
*1: Except for the operating ambient temperature and storage temperature, all ratings are for T
a
=
25°C.
*2: For 70°C and IC alone.
*3: n
=
22, 25, 26, 27, 28
*4: n
=
1, 2, 3, 4, 5, 6, 8, 10, 11
s
Recommended Operating Range
Parameter
Supply voltage
Symbol
V
CC
V
M
V
REG
Range
4.25 to 5.5
4.5 to 14
Unit
V
s
Electrical Characteristics at T
a
=
25°C
Parameter
Overall
Circuit current 1
Circuit current 2
Start/stop
Start voltage
Stop voltage
V
START
V
STOP
Voltage with which a circuit operates
at V
CC
=
5 V and L
→
H
Voltage with which a circuit becomes
off at V
CC
=
5 V and H
→
L
3.5
1.0
V
V
I
CC1
I
CC2
V
CC
=
5 V in power save mode
V
CC
=
5 V, I
O
=
0 mA
0
8
0.1
16
mA
mA
Symbol
Conditions
Min
Typ
Max
Unit
3
AN8481SB
s
Electrical Characteristics at T
a
=
25°C (continued)
Parameter
Hall bias
Hall bias voltage
Hall amplifier
Input bias current
In-phase input voltage range
Minimum input level
Torque command
In-phase input voltage range
Offset voltage
Dead zone
Input current
Input/output gain
Output
High-level output saturation voltage
Low-level output saturation voltage
Torque limit current
FG
FG output high-level
FG output low-level
In-phase input voltage range
FG hysteresis width
Triangular wave oscillation circuit
Charging current
Discharging current
I
CH
I
DCH
V
CC
=
5 V, FC
=
0.5 V
V
CC
=
5 V, FC
=
2.5 V
V
CC
=
5 V
V
CC
=
5 V
−100
25
FG
H
FG
L
V
FGR
H
FG
V
CC
=
5 V, I
FG
= −
0.01 mA
V
CC
=
5 V, I
FG
=
0.01 mA
V
CC
=
5 V,
Input D-range at H2+, H2−
V
CC
=
5 V
3.0
1.5
1
V
OH
V
OL
I
TL
V
CC
=
5 V, I
O
= −300
mA
V
CC
=
5 V, I
O
=
300 mA
V
CC
=
5 V, R
CS
=
0.5
Ω
390
EC
EC
OF
EC
DZ
EC
IN
A
CS
V
CC
=
5 V
V
CC
=
5 V
V
CC
=
5 V
V
CC
=
5 V, EC
=
ECR
=
2.5 V
V
DD
=
5 V, R
CS
=
0.5
Ω
1
−150
50
−5
0.31
0
I
BH
V
HBR
V
INH
V
CC
=
5 V
V
CC
=
5 V
V
CC
=
5 V
1.5
60
1
V
HB
V
CC
=
5 V, I
HB
=
20 mA
0.7
Symbol
Conditions
Min
ICs for Motor
Typ
Max
Unit
1.2
1.6
V
µA
V
mV[p-p]
5
4.0
3.9
150
150
0.51
V
mV
mV
µA
A/V
100
−1
0.41
0.9
0.2
530
1.6
0.6
670
V
V
mA
V
CC
0.5
3.0
20
−25
100
V
V
V
mV
µA
µA
10
−50
50
Lower side voltage detection circuit
Input to output gain
SW-REG driving circuit
PNP driving current
•
Design reference data
Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed.
G
V1
5
10
20
times
I
SWB
10
50
mA
Parameter
Thermal protection
Thermal protection operating
temperature
Thermal protection hysteresis width
Symbol
Conditions
V
CC
=
5 V,
∆EC =
100 mV
V
CC
=
5 V,
∆EC =
100 mV
Min
Typ
Max
Unit
°C
°C
T
SDON
∆T
SD
170
45
4
ICs for Motor
s
Usage Notes
AN8481SB
Prevent this IC from being line-to-ground fault. (To be concrete, do not short-circuit any of pins A1 (pin 27), A2 (pin
26) and A3 (pin 25) to V
REG
pin (pin 19) or VM pin (pin 20).)
s
Application Notes
•
P
D
T
a
curves of HSOP042-P-0400
P
D
T
a
2 400
2 232
2 200
2 000
Mounted on standard board
(glass epoxy: 75
×
75
×
t1.6 mm
3
)
R
th(j-a)
=
56°C/W
P
D
=
2 232 mW (25°C)
Power dissipation
P
D
(mW)
1 800
1 600
1 400
1 200
1 042
1 000
800
600
400
200
0
0
25
50
Independent IC
without a heat sink
R
th( j-a)
=
120°C/W
P
D
=
1 042 mW (25°C)
75
100
125
150
Ambient temperature
T
a
(°C)
•
Phase conditions between Hall input and output current
Phase of Hall pin
H1+
A
B
C
D
E
F
H
H
M
L
L
M
H1
H3+
L
M
H
H
M
L
H3
H2
H1
H2
H2+
M
L
L
M
H
H
H3
0
ECR
EC
A3
Emit
Output current
0
Sink
A
B
C
D
E
F
A2
A1
A2
A3
A1
0
5
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