Rohm BD7755RFV System motor driver ic for half height drive (sensor less) Datasheet

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<Torque instruction input / output>
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+
TKO-
17
19
160kΩ
26.5kΩ
160kΩ
26.5kΩ
CURR.FEED
OSC
26.5kΩ
160kΩ
160kΩ
26.5kΩ
26.5kΩ
26.5kΩ
PRE
Logic
CURR.FEED
26.5kΩ
CURR.
LIMIT
OSC
160kΩ
TKIN
Logic
OSC
26.5kΩ
160kΩ
160kΩ
18
OSC
26.5kΩ
26.5kΩ
160kΩ
160kΩ
160kΩ
CURR.
LIMIT
PRE
Logic
160kΩ
FF
26.5kΩ
PRE
Logic
TLO-
16
160kΩ
26.5kΩ
20
PRE
Logic
TLO+
15
CURR.FEED
OSC
40kΩ
80kΩ
AVM/2
FCO-
14
40kΩ
FF
13
LDVM/2
AGND
80kΩ
80kΩ
AVM/2
12
AVM/2
11
LDO-
FCO+
T.S.D
10
80kΩ
LDO+
BEMF
DETECTER
LEVEL
SHIFT
9
×2
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
50kΩ
180kΩ
270kΩ
150kΩ
150kΩ
50kΩ
50kΩ
25pin
100kΩ
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
62.6kΩ
LEVEL
SHIFT
62.6kΩ
W
IL
29
SAIN1
VSAIN2
28
SAIN2
V
RLSP
2
1
SW-RL
2
1
1
SW-IL
VSAIN1
OUTSP
U
2
1
SW-IL
2-W
2-U
8/18
47µH
RLSP
SW-RL
RLSP
47µH
47µH
2-V
1
IL
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VSLIN2
30
LEVEL
SHIFT
Vo SW-RL
2
2
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
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.
①
・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
SPIN<VC
120°energizing
150°energizing
LRPM mode
LRPM=High
SPIN>VC
120°energizing
SPIN<VC
(H,Hi-Z,Hi-Z)
Short brake
* PWM frequency becomes 30kHz (Typ.) in LRPM mode.
The torque at SPIN<VC becomes a counter torque
⑥
Low rotation mode
Please make to low rotation mode (LRPM=HI) after it starts in normal mode (LRPM=L).
1-3.Gain switching mode
Spindle driver and actuator driver 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 LRPM terminal.
LRPM
L
HiZ
H
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© 2010 ROHM Co., Ltd. All rights reserved.
SP Gain
H gain (3.5A/V±0.82A/V)
L gain (0.7A/V±0.17A/V)
L gain (0.7A/V±0.17A/V)
9/18
ACT Gain (3ch)
H gain (21.6dB±2dB)
H gain (21.6dB±2dB)
L gain (15.6dB±2dB)
2010.06 - Rev.A
Technical Note
BD7755RFV
2. Output limit for spindle (SPLIM)
3. Torque command (SPIN) (SLIN1,2) (SAIN1,2)
The relation between (the torque command inputs) and (Iosp or Ioo) is expressed in the figure below: The gain is defined
by the inclination between two points. (Please exclude the dead zone from the input voltage when calculating Iop. )
Iop
Forward rotation
Input dead zone +
Input dead zone -
Gain
SPIN
SLIN1,2
SAIN1,2
VC
4. FG output (FG)
3FG output begins after 900°degrees in electric angle, after the start mode ends and the BEMF detection starts. When
the rotational speed becomes 24rpm (Max.) or less in case of brake, the FG output is fixed to high.
The above-mentioned rotation speed applies to the 12 pole motor.
5. Input/Output timing chart
BEMFU
》
》
BEMFV
》
》
BEMFW
》
》
》
》
》
》
》
》
》
》
SPIN
VC
SOURCE
U
MID
SINK
SOURCE
V
MID
SINK
SOURCE
W
MID
SINK
Ⅰ) Forward
-rotation mode
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© 2010 ROHM Co., Ltd. All rights reserved.
Ⅱ) Reverse-rotation
braking mode
10/18
Ⅲ) Short-circuit
braking mode
2010.06 - Rev.A
Technical Note
BD7755RFV
6. Protect system 1
It is a function to mute the actuator outputs when the IC outputs the current more than the setting threshold value IPRTLIM
for 1.2sec because of the protection for the focus, the tracking, and the tilt coil. Outputs are muted similarly when the
output current of two or three CHs continuously exceed the threshold for 1.2sec.
It returns to normal operation by setting CTL2=L.
A
IPRTLIM =
(A) A = 8750
RPRTLIM(Ω)
PRTFLG(OUTPUT)
Actuator output (FCO/TKO/TLO)
H
OFF
L
active
Time until protection function operates
MIN.
TYP.
MAX.
Unit
1.0
1.2
1.4
s
FCIN1
0
FCIN1
0
Current between
FCO outputs
0
threshold current
Current between
FCO outputs
0
Current between
TLO outputs
0
threshold current
Current between
TLO outputs
0
threshold current
Current between
TKO outputs
0
threshold current
Current between
TKO outputs
0
threshold current
threshold current
reset
High
Low
CTL2
CTL2
1.2sec
mute
High
Low
1.2sec
mute
7. Protect system 2
Function to protect against destruction of output terminal when output pin connects to GND or Vcc.
PRTFLG(OUTPUT)
Spindle, Sled motor driver output
H
OFF
L
active
・Spindle, Sled motor
・When SINK side POWER transistor has been turned on, if the output voltage (SPVM/2&SLVM/2<TYP> or more) are
detected, the channel concerned will be turned off.
・When SOURCE side POWER transistor has been turned on, if the output voltage (SPVM/2&SLVM/2<TYP> or less ) are
detected, the channel concerned will be turned off.
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11/18
2010.06 - Rev.A
Technical Note
BD7755RFV
8. Inner detection function
BEMF of the motor is monitored according to timing for the sled input signal to pass VC, and Sled is detected reaching the
inner. The judgment voltage of BEMF can be set according to the voltage input to the terminal SLDET. If BEMF below the
judgment voltage is detected twice continuously, it becomes SLDETOUT=L. The inner detection function can be turned off
with SLDET<0.5V. When the motor starts, the terminal SLDETOUT might become L because BEMF is unstable. Please
take measures such as installing the time of the mask when it starts for the detection prevention.
Judgment voltage Vbemf =2.1 × (SLDET - VC) + 0.49
SLIN1 SLIN2
VC
Motor
Instability
Stop
:Detection point
BEMF < Vbemt
:Detection point
BEMF > Vbemt
SLDETOUT
X
SLDET
9. PWM oscillation frequency
The PWM oscillation for driving the spindle and sled is free running.
The sled and SA oscillating frequency is 100kHz (Typ.)
The spindle oscillating frequency is 167kHz (Typ.)
10. Muting functions
a) VC-drop muting
When the voltage at VC terminal drops to a value lower than 0.7V (Typ.), the outputs of all the channels are turned off.
Set the VC terminal voltage higher than 1.0V.
b) Vcc-drop muting
When the voltage at DVcc terminal and Vcc terminal drop to lower than 3.85V (Typ.), the outputs of all the channels
are turned off.
c) Over voltage protection circuit
When the voltage at SPVM terminal exceed 14.1V (Typ.), only the spindle block output is turned off.
11. Thermal-shut down
Thermal-shutdown circuit (over-temperature protection circuit) is built in to prevent the IC from thermal breakdown. Use
the IC according to the thermal loss allowed in the package. In case the IC is left running over the allowed loss, the
junction temperature rises, and the thermal-shutdown circuit works at a junction temperature of 175℃(Typ.) (All other
channel outputs are turned off)
When the junction temperature drops to 150℃ (Typ.) the IC resumes operation.
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12/18
2010.06 - Rev.A
Technical Note
BD7755RFV
●Notes for use
1. Absolute maximum ratings
We are careful enough for quality control about this IC. So, there is no problem under normal operation, excluding that it
exceeds the absolute maximum ratings. However, this IC might be destroyed when the absolute maximum ratings, such
as impressed voltages (Vcc, PVcc) or the operating temperature range(Topr), is exceeded, and whether the destruction is
short circuit mode or open circuit mode cannot be specified. Please take into consideration the physical countermeasures
for safety, such as fusing, if a particular mode that exceeds the absolute maximum rating is assumed.
2. Power supply line
Due to switching and EMI noise generated by magnetic components (inductors and motors), using electrolytic and ceramic
suppress filter capacitors(0.1μF) close to the IC power input terminals (Vcc and GND) is recommended. Please note: the
electrolytic capacitor value decreases at lower temperatures. Current rush might flow momentarily by the order of turning
on the power supply and the delay in IC with two or more power supplies. Note the capacity of the power supply coupling,
width and drawing the power supply and the GND pattern wiring.Please make the power supply lines (where large current
flow) wide enough to reduce the resistance of the power supply patterns, because the resistance of power supply pattern
might influence the usual operation (output dynamic range etc…).
3. GND line
The ground line is where the lowest potential and transient voltages are connected to the IC.
4. Thermal design
Do not exceed the power dissipation (Pd) of the package specification rating under actual operation, and please design
enough temperature margins.
5. Short circuit mode between terminals and wrong mounting
Do not mount the IC in the wrong direction and be careful about the reverse-connection of the power connector. Moreover,
this IC might be destroyed when the dust short the terminals between them or GND
6. Radiation
Strong electromagnetic radiation can cause operation failures.
7. ASO(Area of Safety Operation.)
Do not exceed the maximum ASO and the absolute maximum ratings of the output driver.
8. TSD(Thermal shut-down)
The TSD is activated when the junction temperature (Tj) reaches 175℃(with 25℃ hysteresis), and the output terminal is
switched to Hi-z. The TSD circuit aims to intercept IC from high temperature. The guarantee and protection of IC are not
purpose. Therefore, please do not use this IC after TSD circuit operates, nor use it for assumption that operates the TSD
circuit.
9. Inspection by the set circuit board
The stress might hang to IC by connecting the capacitor to the terminal with low impedance. Then, please discharge
electricity in each and all process. Moreover, in the inspection process, please turn off the power before mounting the IC,
and turn on after mounting the IC. In addition, please take into consideration the countermeasures for electrostatic
damage, such as giving the earth in assembly process, transportation or preservation.
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13/18
2010.06 - Rev.A
Technical Note
BD7755RFV
10. Earth wiring pattern
+
This IC is a monolithic IC, and has P isolation and P substrate for the element separation. Therefore, a parasitic PN
junction is firmed in this P-layer and N-layer of each element. For instance, the resistor or the transistor is connected to the
terminal as shown in the figure below. When the GND voltage potential is greater than the voltage potential at Terminals A
or B, the PN junction operates as a parasitic diode. In addition, the parasitic NPN transistor is formed in said parasitic diode
and the N layer of surrounding elements close to said parasitic diode. These parasitic elements are formed in the IC
because of the voltage relation. The parasitic element operating causes the wrong operation and destruction. Therefore,
please be careful so as not to operate the parasitic elements by impressing to input terminals lower voltage than GND(P
substrate). Please do not apply the voltage to the input terminal when the power-supply voltage is not impressed. Moreover,
please impress each input terminal lower than the power-supply voltage or equal to the specified range in the guaranteed
voltage when the power-supply voltage is impressing.
Resistor
Transistor(NPN)
Terminal-A
Terminal-B
C
Terminal-B
B
E
Terminal-A
B
P+
P+
P
Parasitic
element
C
E
P+
P
+
P
P-Substrate
P-Substrate
Surrounding
elements
Parasitic
element
GND
Parasitic
element
Parasitic
element
GND
GND
GND
Simplified structure of IC
11. Earth wiring pattern
Use separate ground lines for control signals and high current power driver outputs. Because these high current outputs
that flows to the wire impedance changes the GND voltage for control signal. Therefore, each ground terminal of IC must
be connected at the one point on the set circuit board. As for GND of external parts, it is similar to the above-mentioned.
12. Reverse-rotation braking
In the case of reverse-rotation braking from high speed rotation, pay good attention to reverse electromotive force.
Furthermore, fully check the voltage to be applied to the output terminal and consider the revolutions applied to the
reverse-rotation brake.
13. About the capacitor between SPVM and SPGND
The capacitor between SPVM and SPGND absorbs the change in a steep voltage and the current because of the PWM
drive, as a result, there is a role to suppress the disorder of the SPVM voltage. However, the effect falls by the influence of
the wiring impedance etc, if the capacitor becomes far from IC. Please examine the capacitor between SPVM and SPGND
to arrange it near IC.
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© 2010 ROHM Co., Ltd. All rights reserved.
14/18
2010.06 - Rev.A
Technical Note
BD7755RFV
1
C_COM
2
53
GND
FG
3
52
SPVM
CTL1
4
51
COM
50
W
49
N.C.
48
V
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
32
SAVM
31
SLIN1
30
SLIN2
29
SAIN1
28
SAIN2
6
PRTLIM
7
PRTLIM
SPIN
8
LDIN
9
40kΩ
OSC
T.S.D
15
TLO+
16
17
160kΩ
160kΩ
160kΩ
TKOTKIN
20
TLIN
21
FCIN
22
AVM
23
AVM/2
18
19
26.5kΩ
26.5kΩ
160kΩ
26.5kΩ
26.5kΩ
160kΩ
160kΩ
160kΩ
CURR.FEED
OSC
26.5kΩ
26.5kΩ
26.5kΩ
26.5kΩ
STM
PRE
Logic
CURR.FEED
26.5kΩ
160kΩ
160kΩ
160kΩ
TKO+
26.5kΩ
CURR.
LIMIT
OSC
PRE
Logic
FCO-
160kΩ
AVM/2
14
AVM/2
FCO+
26.5kΩ
CURR.
LIMIT
OSC
26.5kΩ
PRE
Logic
160kΩ
80kΩ
PRE
Logic
80kΩ
FF
13
CURR.FEED
OSC
40kΩ
FF
AGND
40kΩ
FF
LDO-
12
80kΩ
FF
11
LDVM/2
80kΩ
TLO-
CURR.
FEED
×2
10
LDO+
Logic
5
LEVEL
SHIFT
CTL2
LRPM
BEMF
DETECTER
STBY
BRAKE
CONTROL
SPLIM
LDVM
M
1.5kΩ
54
LRPM
1000pF
C_OUT
CURR.
LIMIT
●Application circuit
,
STM
DETECTER
CURR.FEED
VC
24
LEVEL
SHIFT
VCC
25
LEVEL
SHIFT
PRTFLG
26
DVCC
27
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© 2010 ROHM Co., Ltd. All rights reserved.
PROTECT
15/18
LEVEL
SHIFT
62.6kΩ
LEVEL
SHIFT
62.6kΩ
2010.06 - Rev.A
Technical Note
BD7755RFV
●Connecting wires of application board
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16/18
2010.06 - Rev.A
Technical Note
BD7755RFV
●Pattern drawing of application board
Power dissipation : Pd (W)
●Power dissipation reduction
2.0
1.5W
1.0
0
25
50
75
100
125
150
AMBIENT TEMPERATURE : Ta (℃)
*70mm×70mm, t=1.6mm, occupied copper foil is less than 3%, glass epoxy mounting.
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17/18
2010.06 - Rev.A
Technical Note
BD7755RFV
●Ordering part number
B
D
7
Part No.
7
5
5
Part No.
7755
R
F
V
-
Package
RFV: HTSSOP-B54R
E
2
Packaging and forming specification
E2: Embossed tape and reel
(HTSSOP-B54R)
HTSSOP-B54R
<Tape and Reel information>
18.5±0.1
(MAX 18.85 include BURR)
+6°
4° −4°
(6.0)
1.0±0.2
0.5±0.15
(5.0)
1
Embossed carrier tape (with dry pack)
Quantity
1500pcs
28
7.5±0.1
9.5±0.2
54
Tape
Direction
of feed
E2
The direction is the 1pin of product is at the upper left when you hold
( reel on the left hand and you pull out the tape on the right hand
)
27
1PIN MARK
+0.05
0.17 -0.03
0.8
0.08±0.05
1.0MAX
0.85±0.05
S
0.08 S
0.65
+0.05
0.22 -0.04
0.08
1pin
M
Reel
(Unit : mm)
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18/18
Direction of feed
∗ Order quantity needs to be multiple of the minimum quantity.
2010.06 - Rev.A
Notice
Notes
No copying or reproduction of this document, in part or in whole, is permitted without the
consent of ROHM Co.,Ltd.
The content specified herein is subject to change for improvement without notice.
The content specified herein is for the purpose of introducing ROHM's products (hereinafter
"Products"). If you wish to use any such Product, please be sure to refer to the specifications,
which can be obtained from ROHM upon request.
Examples of application circuits, circuit constants and any other information contained herein
illustrate the standard usage and operations of the Products. The peripheral conditions must
be taken into account when designing circuits for mass production.
Great care was taken in ensuring the accuracy of the information specified in this document.
However, should you incur any damage arising from any inaccuracy or misprint of such
information, ROHM shall bear no responsibility for such damage.
The technical information specified herein is intended only to show the typical functions of and
examples of application circuits for the Products. ROHM does not grant you, explicitly or
implicitly, any license to use or exercise intellectual property or other rights held by ROHM and
other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the
use of such technical information.
The Products specified in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices).
The Products specified in this document are not designed to be radiation tolerant.
While ROHM always makes efforts to enhance the quality and reliability of its Products, a
Product may fail or malfunction for a variety of reasons.
Please be sure to implement in your equipment using the Products safety measures to guard
against the possibility of physical injury, fire or any other damage caused in the event of the
failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM
shall bear no responsibility whatsoever for your use of any Product outside of the prescribed
scope or not in accordance with the instruction manual.
The Products are not designed or manufactured to be used with any equipment, device or
system which requires an extremely high level of reliability the failure or malfunction of which
may result in a direct threat to human life or create a risk of human injury (such as a medical
instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuelcontroller or other safety device). ROHM shall bear no responsibility in any way for use of any
of the Products for the above special purposes. If a Product is intended to be used for any
such special purpose, please contact a ROHM sales representative before purchasing.
If you intend to export or ship overseas any Product or technology specified herein that may
be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to
obtain a license or permit under the Law.
Thank you for your accessing to ROHM product informations.
More detail product informations and catalogs are available, please contact us.
ROHM Customer Support System
http://www.rohm.com/contact/
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R1010A
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