System Motor Driver ICs for CD / DVD / Blu-ray Drive and Recorder
System Motor Driver IC
for Half Height Drive (Sensor less)
BD7755RFV
No.10012EAT01
●Description
BD7755RFV are ICs, developed for the spindle motor, actuator coil, tilt coil, stepping motor, SA stepping motor and the
loading motor drive of the desktop Blu-ray drive and Blu-ray recorder. Spindle driver adopted sensorless drive system, and
the hall sensor (3 pieces) of the motor position detection is not needed, it is suitable for making of flexible cable conserve
wiring and the reductions of external parts. The low rotation mode is built in, and stability and low-speed a rotation is
achieved. The spindle, stepping and SA stepping use power MOSFET to reduce power consumption and the actuator, tilt,
and loading driver use a linear BTL drive system to reduce noise.
●Features
1) The low-speed stability rotation is achieved with built-in the low rotation mode.
2) The hall sensor is unnecessary according to 3 aspect sensorless drive system.
3) The spindle motor driver achieves stability high speed start by ROHM's own energizing method.
4) Highly effective spindle, stepping and SA stepping is achieved by PWM control driver. And the output current detection
resistance of stepping and SA stepping is unnecessary by built-in internal detection circuit.
5) The actuator, tilt and loading driver achieve low noise by using linear BTL drive system.
6) ON/OFF of loading and other channels, brake mode of spindle driver and standby mode are selectable by the two
control terminals.
7) Built-in thermal-shut down circuit.
8) Improved heat radiation efficiency utilizing HTSSOP package.
●Applications
For desktop Blu-ray drive
●Absolute maximum ratings
Parameter
Symbol
Ratings
POWER MOS power supply voltage 1
SPVM, SLVM
15
#1
V
POWER MOS power supply voltage 2
SAVM
7
#2
V
Vcc, AVM, LDVM
15
V
DVcc
7
V
Pd
1.5
Operating temperature range
Topr
-20 ~ 70
℃
Storage temperature
Tstg
-55 ~ 150
℃
Junction temperature
Tjmax
150
℃
Preblock/BTL power block power supply voltage
PWM control block power supply voltage
Power dissipation
#1
#2
#3
Unit
#3
W
POWER MOS output terminals (40~43pin, 46~48pin) are contained.
POWER MOS output terminals (35~38pin) are contained.
PCB mounting (70mmX70mmX1.6mm, occupied copper foil is less than 3%, glass epoxy standard board).
Reduce by 12mW/℃ over 25℃
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© 2010 ROHM Co., Ltd. All rights reserved.
1/18
2010.06 - Rev.A
Technical Note
BD7755RFV
●Recommended operating conditions
(Set the power supply voltage with consideration to power dissipation)
Parameter
Spindle / Sled motor driver power block power
supply voltage
Symbol
Ratings
Min.
Typ.
SPVM,SLVM
-
Vcc
Vcc
10.8
LDVM
Unit
Max.
#4
-
V
12
13.2
V
4.3
5.0
Vcc
V
SAVM,AVM
4.3
5.0
5.5
V
PWM control block power supply voltage
DVcc
4.3
5.0
5.5
V
Spindle driver output current
Iosp
-
1.0
2.5
Actuator, SA, sled, loading motor driver
output current
Ioo
-
0.5
0.8
Pre block power supply voltage
Loading driver power block supply voltage
SA, Actuator driver power block
power supply voltage
#4
#5
#5
A
A
Set the same supply voltage to SPVM, SLVM and Vcc.
The current is guaranteed 3.5A in case of the Short-circuit braking mode and the current which is turned on/off in
a duty-ratio of less than 1/10 with a maximum on-time of 5msec
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© 2010 ROHM Co., Ltd. All rights reserved.
2/18
2010.06 - Rev.A
Technical Note
BD7755RFV
●Electrical characteristics
(Unless otherwise noted, Ta=25℃, Vcc=SPVM=SLVM=12V, DVcc=AVM=SAVM= LDVM=5V, Vc=1.65V,RL=8Ω,RLSP=2Ω)
Limits
Parameter
Symbol
Unit
Conditions
MIN.
TYP.
MAX.
Circuit current
Quiescent current 1
IQ1
-
14
30
mA
Vcc(Loading OFF)
Quiescent current 2
IQ2
-
7.5
16
mA
Vcc(Loading ON)
Quiescent current 3
IQ3
-
7
14
mA
DVcc
Standby-on current 1
IST1
-
1.1
2.4
mA
Vcc
Standby-on current 2
IST2
-
0.16
0.4
mA
DVcc
Sled driver block
Input dead zone (one side)
Input output gain
Output On resistor
(top and bottom)
Output limit current
PWM frequency
VDZSL
0
30
80
mV
gmSL
0.75
1.0
1.25
A/V
RONSL
-
2.2
3.8
Ω
ILIMSL
0.8
1.1
1.4
A
fosc
-
100
-
kHz
IL=500mA
Spindle driver block
Input dead zone (one side)1
VDZSP1
20
55
90
mV
VLRPM=L
Input dead zone (one side)2
VDZSP2
20
240
450
mV
VLRPM=H
Input output gain 'H'
gmSPH
2.68
3.5
4.32
A/V
VLRPM=L
Input output gain 'L'
gmSPL
0.53
0.7
0.87
A/V
VLRPM=H
Output On resistor (top and bottom)
RONSP
-
1.0
1.7
Ω
IL=500mA
Output limit current
ILIMSP
1.35
1.6
1.85
A
RSPLIM=1.5kΩ
fosc
-
167
-
kHz
High voltage
VOH
-
4.9
-
V
Low voltage
VOL
-
0.1
-
V
Output offset voltage
VOFA
-50
0
50
mV
Output saturation voltage (top and bottom)
VOHA
-
0.9
1.8
V
IL=500mA
Voltage gain H
GVAH
19.6
21.6
23.6
dB
VLRPM=L
Voltage gain L
GVAL
13.6
15.6
17.6
dB
VLRPM=H
VDZSA
40
80
160
mV
PWM frequency
FG output, PRTFLG output
100kΩ pull up to DVcc
Focus / Tracking / Tilt driver block
SA stepping driver block
Input dead zone (one side)
Input output gain
gmSA
0.15
0.2
0.25
A/V
Output On resistor (top and bottom)
RONSA
-
1.3
2.5
Ω
Output limit current
ILIMSA
0.28
0.4
0.52
A
fosc
-
100
-
kHz
Output offset voltage
VOFLD
-50
0
50
mV
Output saturation voltage (top and bottom) 1
VOLD1
-
0.7
1.6
V
IL=500mA LDVM=5V
Output saturation voltage (top and bottom) 2
VOLD2
-
2.1
3.6
V
IL=500mA LDVM=12V
Voltage gain
GVLD
15.5
17.5
19.5
dB
PWM frequency
IL=200mA
Loading driver block
CTL1,CTL2, LRPM
Input high voltage
VIH
2.5
-
3.7
V
Input low voltage
VIL
GND
-
0.5
V
Others
VC drop-muting
VMVC
0.4
0.7
1.0
V
Vcc drop-muting
VMVcc
3.45
3.85
4.25
V
*This product is not designed to be radiation-resistant.
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© 2010 ROHM Co., Ltd. All rights reserved.
3/18
2010.06 - Rev.A
Technical Note
BD7755RFV
1
C_COM
SPLIM
2
53
GND
FG
3
52
SPVM
CTL1
4
51
COM
CTL2
5
50
W
LRPM
6
49
N.C.
PRTLIM
7
PRTLIM
48
V
SPIN
8
47
U
46
N.C.
45
SPGND
44
SLVM
43
SLO2-
42
SLO2+
41
SLO1-
40
SLO1+
39
SL/SAGND
38
SAO2-
37
SAO2+
36
SAO1-
35
SAO1+
34
SLDETOUT
33
SLDET
TKO-
160kΩ
26.5kΩ
160kΩ
160kΩ
160kΩ
26.5kΩ
160kΩ
26.5kΩ
CURR.FEED
OSC
17
160kΩ
160kΩ
26.5kΩ
26.5kΩ
18
19
160kΩ
160kΩ
26.5kΩ
26.5kΩ
PRE
Logic
CURR.FEED
26.5kΩ
CURR.
LIMIT
OSC
160kΩ
TKIN
OSC
26.5kΩ
26.5kΩ
160kΩ
15
16
CURR.
LIMIT
PRE
Logic
26.5kΩ
PRE
Logic
TKO+
160kΩ
26.5kΩ
20
PRE
Logic
TLO-
80kΩ
AVM/2
TLO+
CURR.FEED
OSC
40kΩ
80kΩ
AVM/2
FCO-
14
40kΩ
FF
13
80kΩ
FF
AGND
LDVM/2
12
AVM/2
11
Logic
OSC
10
LDO-
FCO+
×2
T.S.D
80kΩ
LDO+
BEMF
DETECTER
LEVEL
SHIFT
9
CURR.
FEED
FF
LDVM
40kΩ
FF
LDIN
STBY
BRAKE
CONTROL
54
LRPM
C_OUT
CURR.
LIMIT
●Block diagram
TLIN
21
FCIN
22
AVM
23
DETECTER
CURR.FEED
32
SAVM
24
LEVEL
SHIFT
31
SLIN1
VCC
25
LEVEL
SHIFT
30
SLIN2
PRTFLG
26
29
SAIN1
DVCC
27
28
SAIN2
VC
PROTECT
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© 2010 ROHM Co., Ltd. All rights reserved.
4/18
LEVEL
SHIFT
62.6kΩ
LEVEL
SHIFT
62.6kΩ
2010.06 - Rev.A
Technical Note
BD7755RFV
●Pin description
No.
Symbol
1
C_OUT
2
C_COM
3
FG
4
No.
Symbol
28
SAIN2
SA driver 2 input
29
SAIN1
SA driver 1 input
Frequency generator output
30
SLIN2
Sled driver 2 input
CTL1
Driver logic control 1 input
31
SLIN1
Sled driver 1 input
5
CTL2
Driver logic control 2 input
32
SAVM
SA driver power block power supply
6
LRPM
Low rotation mode change terminal
33
SLDET
Sled motor detection signal control input
7
PRTLIM
Adjustable resistor connection for
actuator protection
34 SLDETOUT Sled motor detection signal output
8
SPIN
Spindle driver input
35
SAO1+
SA driver 1 positive output
9
LDIN
Loading driver input
36
SAO1-
SA driver 1 negative output
10
LDVM
Loading driver block power supply
37
SAO2+
SA driver 2 positive output
11
LDO+
Loading driver positive output
38
SAO2-
SA driver 2 negative output
12
LDO-
Loading driver negative output
39 SL/SAGND
Sled/SA driver block pre and power
ground
13
AGND
BTL driver block GND
40
SLO1+
Sled driver 1 positive output
14
FCO+
Focus driver positive output
41
SLO1-
Sled driver 1 negative output
15
FCO-
Focus driver negative output
42
SLO2+
Sled driver 2 positive output
16
TLO+
Tilt driver positive output
43
SLO2-
Sled driver 2 negative output
17
TLO-
Tilt driver negative output
44
SLVM
Sled motor driver power supply
18
TKO+
Tracking driver positive output
45
SPGND
19
TKO-
Tracking driver negative output
46
N.C.
20
TKIN
Tracking driver input
47
U
Spindle driver output U
21
TLIN
Tilt driver input
48
V
Spindle driver output V
22
FCIN
Focus driver input
49
N.C.
23
AVM
Actuator driver block power supply
50
W
24
VC
Reference voltage input
51
COM
Motor coil center point input
25
Vcc
Pre block power supply
52
SPVM
Spindle driver power supply
53
GND
54
SPLIM
26
27
Description
Smooth capacitor connection terminal
(output side)
Smooth capacitor connection terminal
(com side)
PRTFLG Protection flag output
DVcc
PWM block control power supply
Description
Spindle driver power ground
N.C.
N.C.
Spindle driver output W
Pre block GND
Adjustable resistor connection for
spindle driver current limit
*Positive/negative of the output terminals is determined in reference to those of the input terminals.
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© 2010 ROHM Co., Ltd. All rights reserved.
5/18
2010.06 - Rev.A
Technical Note
BD7755RFV
●Equivalent-circuit diagram of the terminals
Three-phase motor driver output
BEMF voltage detection input
52pin
52
10k
5k
1
48
47
2
50
5k
51
45
5k
10k
53pin
PWM driver output SLED1,2
PWM driver output SA1,2
44
32
BTL driver output FC,TK,TL
23
40
41
35
36
14
42
43
37
38
16
17
18
19
15
39
39
13
BTL driver output LD
BTL driver input FC,TK,TL,LD
PWM driver input SLED1,2
25pin
10
12
11
27pin
9
20
200Ω
21
PWM driver input SA1,2
200Ω
31
22
13
30
53pin
53pin
PWM driver input Spindle
Spindle current limit input
52pin
27pin
27pin
62.6kΩ
28
54
8
200Ω
29
53pin
53pin
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© 2010 ROHM Co., Ltd. All rights reserved.
53pin
6/18
2010.06 - Rev.A
Technical Note
BD7755RFV
●Equivalent-circuit diagram of the terminals
PRTFLG, FG signal output
SLDETOUT signal output
25pin
SLED inner detection input
25pin
27pin
3
30Ω
10kΩ
30Ω
26
33
34
10kΩ
53pin
53pin
53pin
Actuator current limit input
Control signal reference voltage input
25pin
50kΩ
25pin
24
10kΩ
62.6kΩ
50kΩ
200Ω
5kΩ
×2ch
7
53pin
10kΩ
×6ch
53pin
×2ch
Control signal
input (CTL1)
Control signal
input (CTL2, LRPM)
25pin
120kΩ
25pin
150kΩ
150kΩ
50kΩ
50kΩ
25pin
100kΩ
50kΩ
180kΩ
270kΩ
6
5
4
50kΩ
20kΩ
20kΩ
50kΩ
50kΩ
150kΩ
150kΩ
53pin
53pin
53pin
53pin
53pin
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© 2010 ROHM Co., Ltd. All rights reserved.
7/18
2010.06 - Rev.A
Technical Note
BD7755RFV
●Test circuit
3
52
FG
SPVM
40kΩ
9
SPGND
26.5kΩ
SL/SAGND
26.5kΩ
+
OUT
26.5kΩ
TK
AVM/2
18
19
160kΩ
160kΩ
26.5kΩ
36
20
SAO1-
35
DETECTER
21
TLIN
FCIN
22
FCIN
AVM
23
24
VCC
VC
IQVC
25
PRTFLG
IQDV
DVCC
PROTECT
OUT+
OUT-
27
DVCC
OUT-A
V
RL
47µH
LEVEL
SHIFT
62.6kΩ
LEVEL
SHIFT
62.6kΩ
W
RLSP
2
SW-RL
2
1
1
SW-IL
IL
29
SAIN1
VSAIN2
28
SAIN2
V
2
1
SW-IL
VSAIN1
OUTSP
U
Vo SW-RL
2
2
2-W
2-U
8/18
47µH
RLSP
SW-RL
RLSP
47µH
47µH
2-V
1
IL
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VSLIN2
30
1
IL
2
31
1
© 2010 ROHM Co., Ltd. All rights reserved.
SAVM
VSLIN1
SLIN2
26
100k
VSLDET
SLIN1
LEVEL
SHIFT
VCC
DVCC
33
SLDET
SAVM
LEVEL
SHIFT
DVCC
34
SLDETOUT
32
AVM
VC
100k
SAO1+
CURR.FEED
TKIN
TLIN
37
SAO2+
26.5kΩ
160kΩ
38
SAO2-
CURR.
LIMIT
26.5kΩ
OSC
TKO-
SLO2
CURR.FEED
OSC
TKO+
TKIN
SLO1+
SAO2
26.5kΩ
26.5kΩ
160kΩ
160kΩ
40
CURR.FEED
39
160kΩ
160kΩ
17
TLO-
SLO1-
PRE
Logic
TL
AVM/2
26.5kΩ
FF
+
OUT
16
TLO+
41
OSC
26.5kΩ
160kΩ
160kΩ
FCO-
SLO2+
SLO1
26.5kΩ
160kΩ
42
CURR.
LIMIT
PRE
Logic
AVM/2
FC
+
OUT
160kΩ
PRE
Logic
26.5kΩ
43
SLO2-
PRE
Logic
160kΩ
FF
80kΩ
FF
OSC
80kΩ
15
SLVM
CURR.FEED
40kΩ
13
AGND
SLVM
44
40kΩ
LDVM/2
LD
12
LDO-
45
80kΩ
FF
+
OUT
11
14
N.C.
OSC
80kΩ
LDO+
FCO+
W
46
T.S.D
10
LDVM
SP
U
LDIN
LDVM
V
CURR.
FEED
×2
47
N.C.
SAO1
SPIN
LDIN
48
OUT
V
8
U
PRTLIM
PRTLIM
VSPIN
49
Logic
BEMF
DETECTER
7
LEVEL
SHIFT
6
LRPM
LRPM
CTL2
LRPM
COM
50
W
+
OUT
5
51
COM
+
OUT
4
CTL1
CTL1
SPVM
+
OUT
CTL2
GND
STBY
BRAKE
CONTROL
DVCC
4.7kΩ
2kΩ
53
C_COM
100k
1
SPLIM
2
2
CCOM
54
1
1
C_OUT
+
OUT
COUT
1
CCOM
CURR.
LIMIT
2
ISPLIM
SW-IL
2010.06 - Rev.A
Technical Note
BD7755RFV
●Functional description
1-1. Driver logic control terminal 1and 2 (CTL1,2)
All drivers and spindle-drive braking modes can be switched on/off by inputting combinations of H-level signal (higher
than 2.5V and lower than 3.7V), L-level signal (lower than 0.5V) and HiZ signal (open) to these terminals.
・Driver ON/OFF logic table
mode
CTL1
CTL2
SP
SL(2ch)
ACT(3ch)
SA(2ch)
LOADING
①
L, HiZ
L, HiZ
×
×
×
×
×
②
H
L
×
○
×
×
○
③
H
HiZ
○
○
○
×
×
④
L, HiZ
H
○
○
○
○
×
○:ON
⑤
H
H
○
○
○
○
×
×:OFF
①
Stand-by mode
The IC is brought into stand-by mode, and its power dissipation can be limited.
②
Drivers muting
All output channels, except the loading and sled motor are muted and their outputs are turned off.
③
SA mute mode
The loading and SA driver are muted.
④⑤ Loading OFF mode
Only the loading driver is muted.
・Spindle braking mode table
mode
CTL1
CTL2
③
H
HiZ
④
L, HiZ
H
⑤
H
H
SPIN > VC
SPIN < VC
Reverse-rotation braking mode (LRPM=L)
Forward-rotation mode
Short-circuit braking mode
Reverse-rotation braking mode (LRPM=L)
③⑤Reverse-rotation braking mode (spindle)
When SPIN < VC, all output are shorted to SPVM in 4500rpm (Typ.) or more, in less than
4500rpm (Typ.) the output become reverse-rotation braking mode.
Rotation speed is less than 140rpm when SPIN < VC, all the output are shorted to SPVM.
(However, the above-mentioned rotational speed is expressed in the case of 12pole motor.)
④
Short-circuit braking mode (spindle)
All the spindle driver outputs are shorted to SPVM when SPIN < VC.
1-2.Spindle output mode
The spindle output changes as follows by the setting of LRPM and SPIN. (CTL1=H,CTL2=H or HiZ)
Rotation speed
0rpm
400rpm
4500rpm
SPIN>VC
120°energizing
150°energizing
Normal mode
⑥
LRPM=Low
SPINVC
120°energizing
SPIN