Harman Kardon FL 8550 (serv.man13) Service Manual ▷ View online
3. SPINDLE SERVO AND LOW PASS FILTER
The 0.033nF and 20K
Ω
connected to SMEF (Pin 25) form the 200Hz low Pass filter. And the carrier
component of spindle servo error signals is eliminated. In the CLV – S mode, SMEF becomes L and
Pin25 LPF fc lowers, strengthening the filter further.
FL8550
21
Features
• 1-phase, full-wave, linear DC motor driver
• Output gain adjustable
• Built in OP-amp
• Built in mute function
• Built in level shift circuit
• Built in thermal shutdown circuit (TSD)
• Operating range 6~13.2V
• Output gain adjustable
• Built in OP-amp
• Built in mute function
• Built in level shift circuit
• Built in thermal shutdown circuit (TSD)
• Operating range 6~13.2V
Description
The KA9258D is a monolithic integrated circuit, suitable for
4-CH motor driver which drives tracking actuator, focus
actuator, sled motor and loading motor of CD/CD-ROM/
DVD system, and can also drive spindle motor of CD
system.
4-CH motor driver which drives tracking actuator, focus
actuator, sled motor and loading motor of CD/CD-ROM/
DVD system, and can also drive spindle motor of CD
system.
28-SSOPH-375
Typical Applications
• Compact disk player (CDP)
• Video compact disk player (VCD)
• Automotive compact disk player
• Other compact disk media
• Video compact disk player (VCD)
• Automotive compact disk player
• Other compact disk media
Ordering Information
Device
Package
Operating Temp.
KA9258BD
28-SSOPH-375
−
40
°
C ~ +85
°
C
KA9258BDTF 28-SSOPH-375
−
40
°
C ~ +85
°
C
KA9258D
4-Channel Motor Driver
FL8550
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Pin Definitions
Pin Number
Pin Name
I/O
Pin Function Description
1
DO1.1
O
Drive output
2
DO1.2
O
Drive output
3
DI1.1
I
Drive input
4
DI1.2
I
Drive input
5
REG
-
Regulator
6
REO
O
Regulator output
7
MUTE
I
Mut e
8
GND1
-
Ground 1
9
DI2.1
I
Drive input
10
DI2.2
I
Drive input
11
DO2.1
O
Drive output
12
DO2.2
O
Drive output
13
GND2
-
Ground 2
14
OPOUT
O
Op-amp output
15
OPIN(
−
)
I
Op-amp input (
−
)
16
OPIN(+)
I
Op-amp input (+)
17
DO3.1
O
Drive output
18
DO3.2
O
Drive output
19
DI3.1
I
Drive input
20
DI3.2
I
Drive input
21
V
CC1
-
Supply voltage
22
V
CC2
-
Supply voltage
23
VREF
I
2.5V bias voltage
24
DI4.1
I
Drive input
25
DI4.2
I
Drive input
26
DO4.1
O
Drive output
27
DO4.2
O
Drive output
28
GND3
-
Ground 3
FL8550
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Internal Block Diagram
+
−
+
−
+
−
+
−
+
−
10k
Level
shift
shift
Regulator
Mute
TSD
+
−
Level
shift
shift
Level
shift
shift
Level
shift
shift
−
+
10k
10k
10k
10k
10k
10k
10k
10k
−
−
+
+
50k
10k
50
k
1
2
3
4
5
6
8
9
10
11
12
13
7
14
DO1.
1
DO1.
2
DI
1.
1
DI
1.
2
REG
REO
MUTE
GND1
DI
2.
1
DI
2.
2
DO2.
1
DO2.
2
GND2
OPOUT
15
16
17
18
19
20
21
22
23
24
25
26
27
28
GND3
DO4.
2
DO4.
1
DI
4
.2
DI
4
.1
VREF
VCC2
VCC1
DI
3
.2
DI
3
.1
DO3.
2
DO3.
1
O
P
IN
(
−
)
OPI
N
(+
)
+
−
+
−
Pin Assignments
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
DO1.
1
DO1.
2
DI
1.
1
DI
1.
2
REG
REO
MUTE
GND1
DI
2.
1
DI
2.
2
DO2.
1
DO2.
2
GND2
OPOUT
GND
3
DO
4.
2
DO
4.
2
DI
4
.2
DI
4
.1
VR
E
F
V
CC2
V
CC1
DI
3
.2
DI
3
.1
DO
3.
2
DO
3.
1
OP
IN
(
+
)
OP
IN
(
−
)
FIN
(GND)
FIN
(GND)
KA9258D
FL8550
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