BD7905BFS
Optical disc ICs
1/17
6CH Power Driver for
CD-ROM, DVD-ROM
BD7905BFS
BD7905BFS is a 6-channel driver IC that integrates all drivers necessary for optical disc driver. Low vibration, low noise,
and low heat operation have been realized by adopting 180
PWM driving system for spindle motor driver. The built-in
2-channel sled motor driver is used for the stepping motor.
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Applications
CD-ROM, DVD-ROM
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Features
1) 3channel BTL driver, 2channel PWM driver and 3phase motor driver.
- ALL of the motor and actuator for CD-ROM, DVD-ROM etc.
2) These mode is able to be selected by the two control terminals.
- ON/OFF of loading, and other 5channels, brake mode and gain select of spindle driver and standby mode.
3) Built-in triangular-wave generator.
4) Package SSOP-A54 has large power dissipation.
5) Built in thermal-shut-down circuit.
Spindle driver
Efficient drive by current feedback 180deg PWM drive.
Built in current limit, hall bias, short brake, FG 3-phase mixed signal output and reverse protection circuit.
Low ON-Resistor. (RON=0.85)
Sled motor driver
Efficient drive by current feedback PWM drive.
Built in 2channel for stepping motor.
Actuator driver, Loading driver
Linear BTL drive system.
BD7905BFS
Optical disc ICs
2/17
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Absolute maximum ratings (Ta=25
C)
Parameter
Symbol
Unit
POWER MOS
power suuply voltage
Preblock/BTL powerblock
power supply voltage
PWM control block
power supply voltage
Power dissipation
Operating temperature range
Storage temperature
SPV
M
1,2,SLRNF1,2
V
CC
,SLV
DD
,AV
M
DV
CC
Pd
Topr
Tstg
Limits
-
55~
+
150
15
1
15
7
2.6
2
-
40~
+
85
V
V
V
W
C
C
1 POWER MOS output terminals (9, 11, 18, 34~37pin) is contained.
2 PCB (70mm
70mm
1.6mm glass epoxy) mounting.
Reduced by 20.8mW for each increase in Ta of 1
C over 25
C.
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Recommended operating conditions (Ta=25
C)
(Set the power supply voltage taking allowable dissipation into considering)
Parameter
Symbol
Max.
Typ.
Min.
Unit
SPV
M
1, 2
-
SLRNF1, 2
-
V
CC
3
-
SLV
DD
3
-
V
V
SLV
DD
, V
CC
V
CC
AV
M
14
12
AV
M
5.0
4.3
V
V
DV
CC
2.5
4
Iosp
6.0
5.0
4.3
1.2
-
V
A
0.8
Ioo
0.5
-
A
POWER MOS Power supply voltage 1
POWER MOS Power supply voltage 2
Preblock Power supply voltage
Power block Power supply voltage
PWM control block Power supply voltage
Spindle output current
SL/FO/TR/LO output current
3 Set the same supply voltage to V
CC
and SPVM1, 2 to SLV
DD
and SLRNF1, 2.
4 The current is guaranteed 3.0A in case of the current is turned on/off in a duty-ratio of
less than 1/10 with a maximum on-time of 5msec.
BD7905BFS
Optical disc ICs
3/17
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Block diagram
1
14
15
16
17
18
19
20
21
22
23
24
25
26
27
2
3
10
9
12
13
11
6
4
5
7
8
54
41
40
39
38
37
36
35
34
33
32
31
30
29
28
53
52
45
46
43
42
44
49
51
50
48
47
PRE
LOGIC
FF
FF
LIMIT
Current
LIMIT
HALL
BIAS
FG
REVERSE
DETECT
OSC
Polarity
COMP
LIMIT
OSC
PRE
LOGIC
STBY/
BRAKE
CONTROL
LEVEL
SHIFT
LEVEL
SHIFT
LEVEL
SHIFT
TSD
PRE LOGIC
+
-
+
-
67k
67k
188k
47k
112.5k
75k
47k
47k
+
-
+
-
+
-
+
-
117.5k
117.5k
47k
47k
FG
DV
CC
HU
+
HU
-
HV
+
HV
-
HW
+
HW
-
HB
PGND1
U
SPV
M
1
V
GND
GND
GND
GND
GND
PGND2
W
SPV
M
2
SPRNF
FG
CTL1
CTL2
SPIN
DGND
LDIN
V
C
FCIN
TKIN
V
CC
LDO
+
LDO
-
TKO
+
TKO
-
FCO
+
FCO
-
AV
M
GND
GND
GND
GND
GND
AGND
SLO1
+
SLO1
-
SLO2
+
SLO2
-
SPCNF
SLRNF2
SLRNF1
SLV
DD
SLIN2
SLIN1
BD7905BFS
Optical disc ICs
4/17
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Pin descriptions
Pin No.
Pin name
Function
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
HU
+
HU
-
HV
+
HV
-
HW
+
HW
-
HB
PGND1
U
SPV
M
1
V
GND
GND
GND
GND
GND
PGND2
W
SPV
M
2
SPRNF
FG
CTL1
CTL2
SPIN
DGND
LDIN
V
C
Pin No.
Pin name
Function
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
SLIN1
SLIN2
SLV
DD
SLRNF1
SLRNF2
SPCNF
SLO2
-
SLO2
+
SLO1
-
SLO1
+
AGND
GND
GND
GND
GND
GND
AV
M
FCO
-
FCO
+
TKO
-
TKO
+
LDO
-
LDO
+
V
CC
TKIN
FCIN
DV
CC
Hall amp. U positive input
Hall amp. U negative input
Hall amp. V positive input
Hall amp. V negative input
Hall amp. W positive input
Hall amp. W negative input
Hall bias
Spindle driver power ground 1
Spindle driver output U
Spindle driver power supply 1
Spindle driver output V
GND
GND
GND
GND
GND
Spindle driver power ground 2
Spindle driver output W
Spindle driver power supply 2
Spindle driver current sense
Frequency generator output
Driver logic control input 1
Driver logic control input 2
Spindle driver input
PWM block pre-ground
Loading driver input
Reference voltage input
Sled driver 1 input
Sled driver 2 input
Sled driver PowerMOS pre-supply
Sled driver 1 current sense
Sled driver 2 current sense
Spindle driver feedback filter
Sled driver 2 negative output
Sled driver 2 positive output
Sled driver 1 negative output
Sled driver 1 positive output
BTL block and sled driver power ground
GND
GND
GND
GND
GND
Actuator driver block power supply
Focus driver negative output
Focus driver positive output
Tracking driver negative output
Tracking driver positive output
Loading driver negative output
Loading driver positive output
BTL pre and Loading power supply
Tracking driver input
Focus driver input
PWM block control power supply
Positive/negative of the output terminals are determined in reference to those of the input terminals.
BD7905BFS
Optical disc ICs
5/17
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Input output circuit
Three-phase motor driver output
Hall signal input
Splindle driver feedback filter pin
PWM driver output SLED1, 2
BTL driver input FO, TK, LD
PWM driver input SLED1, 2
PWM driver input Spindle
BTL driver output FO, TK
BTL driver output LD
Spindle driver current detection input
Hall bias
FG signal output
10
8 17
19
18
11
9
3
1
5
54pin
54pin
54pin
4
2
6
31 32
35
37
34
36
45
47
46
48
51pin
51pin
44pin
49
50
51pin
51pin
51pin
7
54pin
21
54pin
52
26
53
51pin
51pin
47k
Reference voltage input
28
29
30pin
54pin
47k
33
54pin
10k
24
54pin
54pin
112.5k
Control signal input
22
23
54pin
54pin
50k
50k
50k
20
51pin
312.5
27
51pin
3ch
2ch
10k
50k
50k
112.5k
47k
10k
150k
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