Panasonic AN8481SB Datasheet
ICs for Motor
AN8481SB
Spindle motor driver IC for optical disk
■ 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.
■ 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
■ Applications
• High speed CD-ROM drive
• PD, DVD, CD-R, CD-RW drives
18.4±0.2
(5.15)
28 22 21
17 814
(1.2)
(4.8)
(6.4)
0.8
+0.10
0.35
–0.05
Seating plane
15
8.3±0.22.7±0.20.1±0.1
HSOP042-P-0400
+0.10
10.93±0.30
Unit: mm
(1.315)
–0.05
0.30
0° to 10°
0.65±0.20
1
AN8481SB ICs for Motor
■ Block Diagram
REF
V
REG
PCS
SWB
SWG
GND
21
19
18
17
16
14
VM
20
Lower
side
V
CE
detection
Amp.
15
FC
CS1
22
Upper side
distribution
Triangular
wave
1
H1+
A1
27
26
Amp.
Amp.
Lower side
distribution
Direction changeover
Direction
detection
Hall amp. matrix
2
3
4
H1−
H2+
H2−
A2
25
Detection
5
A3
H3+
Logic
ER
EP = ER × EA
6
H3−
Hall
bias
7
VH
VTL
Absolute
value
EA
11
FG
9
FG
comparator
Start/stop
10
EC
PG
28
Thermal
protection
circuit
ECR
13
12
V
CC
PCI
8
S/S
■ Pin Descriptions
Pin No. Symbol Description
1H1+ Hall element-1 positive input pin
2H1− Hall element-1 negative input pin
3H2+ Hall element-2 positive input pin
4H2− Hall element-2 negative input pin
5H3+ Hall element-3 positive input pin
6H3− Hall element-3 negative input pin
7 VH Hall bias pin
8 SS Start/stop changeover pin
9 FG FG signal output pin
10 ECR Torque command reference input pin
2
Pin No. Symbol Description
11 EC Torque command input pin
12 PCI
13 V
Current feedback phase compensation pin
Supply voltage pin
CC
14 SG Signal GND pin
15 FC Triangular wave oscillation pin
16 SWG SW-REG system GND pin
17 SWB SW-REG driving pin
18 PCS
19 V
SW-REG system phase compensation pin
Fixed power supply pin
REG
20 VM Motor supply voltage pin
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