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PDF FAN8742 Data sheet ( Hoja de datos )
| Número de pieza | FAN8742 | |
| Descripción | Spindle Motor and 6-CH Driver | |
| Fabricantes | Fairchild Semiconductor | |
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www.DataSheet4U.com
April 2005
FAN8741/FAN8742
Spindle Motor and 6-CH Driver
[Spindle(PWM), Sled 2-CH(PWM) 4-CH(Linear)]
Features
Common
• Built-in thermal shutdown circuit (TSD)
• 8 Independent voltage sources
• Corresponds to 3.3V or 5V DSP
• 4 selectable mute inputs
Spindle
• Output PWM mode control
• FG output: open collector type
• Selectable brake(short & reverse brake)
• Built-in hall bias
• 180o commutation(compatible with conventional BLDC spindle
motor)
• Built in short-through protection function
BTL(Sled 2-channels)
• Output PWM mode control
• Built in short-through protection function
BTL(Other 4-channels)
• Output linear mode control
Description
Suitable for a 3-phase BLDC (Brush-Less Direct Current) spindle
motor driver with PWM, the monolithic FAN8741/FAN8742 IC also
includes 2-ch motor drivers with PWM for sled motors and 4-ch
linear drivers which drive the focus actuator, tracking actuator, tilt
actuator, and loading motor in optical media applications.
Designed specifically for high-speed/high-density optical media
applications, the FAN8741/FAN8742’s power stage is created by
D-MOS transistors which have extremely low RDSON. This
enables less heat generation and guarantees improved reliability.
The FAN8741G/FAN8742G is available in a 56-SSOP-HS pack-
age, which has high-power dissipation and the leadframe is
exposed to the top side.
The FAN8741MTF/FAN8742MTF is available in a 56-TSSOP-EP
package, which is very thin and the leadframe is exposed to
the bottom side.
Ordering Information
Typical Applications
• CD-ROM
• CD-RW
• DVD-ROM
• DVD-RAM
• DVD Player (DVDP)
• Other compact disk media
• Game consoles
Device
Package Operating Temp.
FAN8741G 56-SSOP-HS −25°C to +75°C
FAN8741GX 56-SSOP-HS −25°C to +75°C
FAN8742G 56-SSOP-HS −25°C to +75°C
FAN8742GX 56-SSOP-HS −25°C to +75°C
FAN8741MTF 56-TSSOP-EP −25°C to +75°C
FAN8741MTFX 56-TSSOP-EP −25°C to +75°C
FAN8742MTF 56-TSSOP-EP −25°C to +75°C
FAN8742MTFX 56-TSSOP-EP −25°C to +75°C
HS=HeatSlug, EP=ExposedPad
X:Tape & Reel type
FAN8741:FG3X
FAN8742:FG1X
©2005 Fairchild Semiconductor Corporation
FAN8741/FAN8742 Rev. 1.0.1
1
www.fairchildsemi.com
1 page  
Pin Definitions
Pin Number
(exposed to bottom)
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
29
30
31
32
33
34
35
36
37
38
39
40
41
42
Pin Number
(exposed to top)
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
Pin Name
VM1
HU+
HU-
HV+
HV-
HW+
HW-
VH
PGND1
U
RSP1
V
PGND2
W
RSP2
SL1+
SL1-
SL2+
SL2-
PGND3
REF
MUTE1
MUTE2
RSL1
RSL2
VM2
SVCC2
SGND
SLIN2
SLIN1
PVCC2
PVCC1
IN2
IN1
PGND4
DO1 +
DO1 -
DO2 +
DO2 -
DO3 +
DO3 -
PVCC3
I/O
P
A
A
A
A
A
A
A
P
A
A
A
P
A
A
A
A
A
A
P
A
A
A
A
A
P
P
P
A
A
P
P
A
A
P
A
A
A
A
A
A
P
FAN8741/FAN8742 Rev. 1.0.1
5
www.DataSheet4U.com
Pin Function Description
Power supply for spindle
Hall signal input(Hu+)
Hall signal input(Hu-)
Hall signal input(Hv+)
Hall signal input(Hv-)
Hall signal input(Hw+)
Hall signal input(Hw-)
Hall bias
Power ground 1 for spindle channel
3-phase output U for spindle
Spindle current sensing 1
3-phase output V for spindle
Power ground 2 for spindle channel
3-phase output W for spindle
Spindle current sensing 2
Sled channel 1 drive output +
Sled channel 1 drive output -
Sled channel 2 drive output +
Sled channel 2 drive output -
Power ground for sled channels
Reference voltage input
Mute input 1
Mute input 2
Sled current sensing 1
Sled current sensing 2
Power supply for sled
Power supply for BTL Pre driver
Signal ground for BTL signal block
Sled channel 2 input
Sled channel 1 input
Power supply for BTL CH3
Power supply for BTL CH1/2
Channel 2 input
Channel 1 input
Power ground for BTL CH1/2
Channel 1 drive output +
Channel 1 drive output -
Channel 2 drive output +
Channel 2 drive output -
Channel 3 drive output +
Channel 3 drive output -
Power supply for BTL CH4
www.fairchildsemi.com
5 Page 
Equivalent Circuits(Pins numbered according to FAN8741MTF)
Charge Pump Outputs
SVCC2
SVCC2
SVCC2
53 54
55
www.DataSheet4U.com
FG/DIR Outputs
SVCC1
50
51
SVCC1
49
10K
Spin Input
SVCC1
1K
1K
Ref
Hall Bias Input
SVCC1
8
60K
Spindle Drive Outputs
11 15
10 12 14
9 13
Hall Inputs
SVCC1
2
1K
4
6
3K
SVCC1
1K
3K
3
5
7
Mute1 & 2 Inputs
SVCC2
22 40K
23
40K
Spindle Current Sensing Input
VM1
15
FAN8741/FAN8742 Rev. 1.0.1
11
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet FAN8742.PDF ] | |
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