SPINDLE MOTOR DRIVER
M56784FP
MITSUBISHI <CONTROL / DRIVER IC>
PIN CONFIGURATION (TOP VIEW)
DESCRIPTION
The M56784FP is a semiconductor integrated circuit in order to
drive the spindle motor.
FEATURES
●Large power dissipation (Power Package).
●3.3V DSP available.
●The supply voltage with wide range.
●High motor drive current.
●Low saturation voltage. (typical 1.2V at load current 500mA)
●Motor current control for both motor torque directions.
●Reverse torque mode select [SHORT BRAKING, etc].
●Sleep mode. (Zero total current)
●Hall amplifier sensitivity select.
(Minimum voltage: 35mVp-p or 50mVp-p)
●FG signal output terminal.
●Automatic stop select. (Removable function)
●Reverse detected signal pin.
APPLICATION
CD-ROM, DVD, DVD-ROM, DVD-RAM etc.
BLOCK DIAGRAM
Outline 42P9R-D
+- +- +-
+
-
VM
120°
MATRIX
TSD
Vref
UVW VCC1
EC ECRHu+ Hu- Hv+ Hv- Hw+ Hw-
S/S
432
20 19 18 17 16 15
28
26 25
41 245
RS
CI
23
Hall
Bias
HB
I/I
Converter
V/I Converter
27
VCC2
FG
RDS
FG
RDS
39
40
+
GND
MODE4 7 SENSE
6
MODE3
MODE2
MODE1
37
36
38
BRAKING
MODE
CHANGE
GND
8 to 14 29 to 35
N.C: no connection
FG
CI
42
39
40
41
1
4
3
2
385
376
736
15 28
16 27
17 26
18 25
19
20
24
23
21 22
N.C
S/S
RDS
MODE2
MODE1
GND
VM
VCC2
EC
ECR
VCC1
HB
N.C
N.C
W
V
U
RS
MODE3
MODE4
GND
Hw-
Hw+
Hv-
Hv+
Hu-
Hu+
N.C
35
34
33
32
31
30
29
8
9
10
11
12
13
14
M56784FP
SPINDLE MOTOR DRIVER
M56784FP
MITSUBISHI <CONTROL / DRIVER IC>
V
ABSOLUTE MAXIMUM RATING (Ta = 25°C)
Symbol Conditions UnitsParameter
VM Motor supply voltage pin 16
PIN DESCRIPTION
Symbol FunctionPin No. Pin No.
N.C
GND
Symbol
—
Hu+ Hu+ Sensor amp. input
Hu- Hu- Sensor amp. input
Hv+ Hv+ Sensor amp. input
Hv- Hv- Sensor amp. input
Hw+ Hw+ Sensor amp. input
Hw- Hw- Sensor amp. input
GND
MODE4 Hall amplifier sensitivity select
MODE3 Automatic stop select
RSMotor current sense
U Motor drive output U
V Motor drive output V
N.C —
S/S Start / Stop
RDS Reverse detected signal
FG Frequency generator output
CIPhase Compensation
MODE2 Reverse torque mode select 2
MODE1 Reverse torque mode select 1
GND GND
VM Motor supply voltage
VCC2 12V supply voltage
EC Motor speed control
ECR The reference voltage for EC
VCC1 5V supply voltage
Function
VCC2
VCC1
Io
VH
(
c
)
Pt
Kθ
Tj
Topr
Rating
V12V supply voltage pin 16 V5V supply voltage 7.0 A1.5
V
Sensor amp.
Differential input range W
Free Air
4.5
mW/°C
Power dissipation Free Air 1.2
°C
Thermal derating 9.6
°C
Junction temperature
°C
Operating temperature 150
-20 – +75
3
4
5
6
15
17
18
19
1
16
23
24
25
26
27
36
38
39
40
22
37
–
29 35
*Pull-up resistors
(
10kohm
)
are included in the circuits connected to pin
[
RDS
]
and pin
[
FG
]
.
24 25
pin
*note 1
– pins
Tstg Storage temperature
Output current
-40 – +125
28
27
15 20
*Note1. The ICs must be operated within the Pt (power dissipation) or the area of safety operation.
24
20
21
–
8 14
7
41
42
28
N.C
W Motor drive output W
—
Bias for Hall SensorHB
—N.C
2
SPINDLE MOTOR DRIVER
M56784FP
MITSUBISHI <CONTROL / DRIVER IC>
RECOMMENDED OPERATING CONDITIONS
V
Limits
Min. T
y
p. Max.
Symbol Units
Parameter
VCC15V Power supply
12V Power supplyVCC2 V
VM
Io Motor Power supply
Output drive current
5.0
12.0
12.0
—
5.5
13.2
13.2
700
4.5
4.5
4.5
—V
mA
ELECTRICAL CHARACTERISTICS (VCC=5V, VCC2=12V ,VM=12V, Ta=25°C unless otherwise noted.)
Limits
Min. T
y
p. Max.
Symbol Conditions UnitsParameter
ICC1 Sleep Mode Supply current - 1 and pin total Input Current
( pin low or open)
ICC2
Vsat
ECdead-
ECdead+
ECR
EC
Gio
VHmin1
Sleep Mode Supply current - 2
Saturation voltage
Control voltage dead zone
Reference voltage Input range
Control voltage Input range
Control gain
Hall sensor amp.
input signal revel
Control limit
pin Input Current ( pin low or open)
Top and Bottom saturation voltage
(Load current: 500mA)
EC < ECR
EC > ECR
pin [3.3V DSP available]
pin [3.3V DSP available]
Io = Gio / Rsense [A/V]
ICC3Supply current - 3
Vlim
VH com
VHmin2
Hall senser amp. common
mode input range
Ilim = Vlim / Rsense [A]
– pins
– pins MODE4 = OPEN or HIGH
MODE4 = GND
pin Input Current (EC = ECR = 2.5V)
[ pin High]
28 27
41
24
24
25
26
15 20
15 20
—
—
—
—
0
-40
0.5
0.5
0.25
0.27
1.2
50
35
0
—
—
1.2
+21
-21
1.65
1.65
0.3
0.3
—
—
—
100
500
6.0
1.9
+40
0
4.0
4.0
0.35
0.33
4.5
—
—
µA
µA
mA
V
mV
V
V
V/V
V
V
mVp-p
41
41
VHb Hall bias terminal output
voltage
IHb
Von
Voff
ViH
ViL
VOL
Hall bias terminal sink current
Motor start voltage
Motor stop voltage
Mode pin input high voltage
pin[RDS], pin[FG]
output low voltage
Mode pin input low voltage
Load current
(
IHb
)
10mA.
Io current = 1mA
0.6
2.0
—
—
2.0
—
—
0.85
—
—
—
—
—
—
1.2
—
30
0.5
—
0.8
0.8
V
V
mA
V
V
V
V
pin input voltage when it stops the motor.
*The IC is in the sleep condition.
*The hall bias is off.
41
pin input voltage when it starts up the motor.
*The IC is in the active condition.
*The hall bias is available.
41
pin [MODE1], pin [MODE2], pin [MODE3]
and pin [MODE4] input voltage
when they are HIGH.
36 37 6
7
pin [MODE1], pin [MODE2], pin [MODE3]
and pin [MODE4] input voltage
when they are LOW.
36 37 6
7
40 39
SPINDLE MOTOR DRIVER
M56784FP
MITSUBISHI <CONTROL / DRIVER IC>
ELECTRICAL CHARACTERISTICS
(VCC1=5V, VCC2=12V, VM=12V, Ta=25°C Unless otherwise noted.)
Figure 1. The characteristics of the control voltage and motor current (Torque).
The relationship between the EC-ECR (the
difference between EC (<control voltage> and
ECR <reference voltage>) and the torque is
shown in Figure 1.
The current gain is 0.6A/V (at sensing resistor:
0.5ohm) in both torque directions, and the
dead zone is from ±0mV to ±40mV.
When the all short brake mode is selected, the
coil current under the reverse torque control
depends on the back emf. and the coil
resistance.
0
0 – +40mV
0 – -40mV
Current limit
0.6A/V
0.6A/V
Current limit
Forward Torque
EC - ECR
Reverse Tor
q
ue
This IC’s package is POWER-SSOP, so
improving the board on which the IC is
mounted enables a large power dissipation
without a heat sink.
For example, using an 1 layer glass epoxy
resin board, the IC’s power dissipation is 2.9W
at least. And it comes to 4.1W by using an
improved 2 layer board.
The information of the H, I, J type board is
shown in the board information.
THERMAL DERATING
Ambient Temperature Ta ( )
Power Dissipation (Pdp)
0 25 50 75 100 125 150
1.0
2.0
3.0
4.0
5.0
6.0
(
W
)
4.1W using H-type board
3.1W using I-type board
2.9W using J-type board
SPINDLE MOTOR DRIVER
M56784FP
MITSUBISHI <CONTROL / DRIVER IC>
HALL AMPLIFIER INPUT AND COMMUTATION
The relationship between the hall amplifier inputs voltage and the motor current outputs is shown in Figure 2.
Hu+Hv+Hw+
SINK
SOURSE
Output
current
Hall
inputs
UV
W
V
UVW WU
Figure 2.
HALL AMPLIFIER INPUT SENSITIVITY SELECT
Figure 3 shows the hall amplifier input sensitivity select function.
You are able to select a sensitivity of a hall amplifier out of two
levels which is suitable for the hall elements type.
If the output minimum level of the hall elements is lower than
50mVp-p, please connect the MODE4 pin to external GND. In this
case, the output current changes shaply. If the output minimum
level of the hall elements is higher than 50mVp-p, please make the
MODE4 pin open, then the output current is commutated softly.
We recommend that the output level of the hall elements be set
between 80mVp-p and 120mVp-p, and the MODE4 pin is an open.
Figure 3.
MODE4
OPEN or HIGH GND
120 degree
soft switching
120 degree switching
** Io current
changes sharply.
The hall amp
minimum input
voltage is
50mVp-p.
The hall amp
minimum input
voltage is
35mVp-p.
W
Hall elements
Outer loator
FORWARD
EC < ECR
U
W
V
U
W
W
VUV
U
V
REVERSE
EC > ECR
SLEEP MODE FUNCTION
Figure 4.
Figure 4 shows the sleep mode function. If the pin [S/S] is set to
be open or low, the motor drive outputs have high impedance and
the motor stops. Then, the IC bias current will be a slight current
(please refer to the electrical characteristics), and the hall bias
output will be cut off. When the pin input is high, all the circuits
will work.
41
41
START / STOP
(
pin
)
LOW or OPEN HIGH
Motor Stop
Bias off
Hall-Bias off
Motor on
Bias on
Hall-Bias on
41
SPINDLE MOTOR DRIVER
M56784FP
MITSUBISHI <CONTROL / DRIVER IC>
Figure 5.
Hall sensor-amp
FG-amp
RDS FG
T
D
Q
Hu+ Hv+
Hw+
Low
REVERSE
Hu+
Hv+Hw+
D
Q
Hi
h
Low
FORWARD
Comparator
Hystel
es
is
Low
RDS
FG Low
FG
CI
Q
MODE3
+
-
+
-
R
EC-ECR
RDS
VCC1
VCC1
Hu+ Hu- Hv+ Hv- Hw+ Hw-
T
Hi
h
D
Q
Hi
h
T
Hi
h
FORWARD AND REVERSE ROTATION DETECT
FUNCTION
Figure 5 shows the circuits and the functions of the forward and
reverse rotation detect.
The output of the RDS pin is determined by the signals of hall
inputs (Hu+, Hu-, Hv+ and Hv-) which indicate the direction of
rotation.
When the motor is spinning forward, the RDS pin output will be
low. When the motor rotates reversely in stop mode, it will be high.
The RDS pin is pulled-up to VCC1 by internal resistor (typ.10kohm).
SPINDLE MOTOR DRIVER
M56784FP
MITSUBISHI <CONTROL / DRIVER IC>
AUTOMATICALY STOP AFTER REVERSE BRAK-
ING FUNCTION
Figure 5 also shows the automaticaly stop (after the reverse
braking) circuit. Figure 6 is its function table which shows whether
the automaticaly stop function is on or off, and its state is
determined by MODE3 input.
When the MODE3 is open or high, the motor will stop rotating
automaticaly after the reverse braking.
When the MODE3 is low or connected to GND, the motor will
continue the reverse rotation. This function is useful for the case
that the system doesn’t require the automaticaly stop function, and
in the system a motor receives a stop command from the outside
of this IC. For example, a µcom can detect the reverse rotation
Figure 6.
OPEN or HIGH GND
MODE3
AUTOMATIC
STOP UN-AUTOMATIC
(NON-STOP)
from the RDS pin output, and can control all the torque of a motor.
So it can stop the motor outside this IC.
FG FUNCTION
Figure 5 also shows the circuits and the functions of the frequency
generator. The FG pin outputs the square pulse signal
synchronizing with the hall inputs [Hv+ and Hv-] timming.
The FG pin is pulled-up to VCC1 by an internal resistor [typ.
10Kohm].
REVERSE TORQUE MODE SELECT FUNCTION
In the 4 times speed and the 6 times speed CDROM drive system,
the reverse braking style has been used for a deceleration of the
rotation speed. However, in the CDROM drive system above an 8
times speed, the motor current above 0.5A is needed, because a
high speed access time are required for motor driver ICs. If the
reverse braking is used at 0.5A, the IC junction temperature will be
too much high, and the heat loss of the IC will be large.
Therefore, this motor driver has the braking mode select function
(REVERSE BRAKING MODE and SHORT BRAKING MODE). The
breaking mode can be determined by the external logic signals
synchronizing with servo timing, and it can make a heat loss of the
IC smaller by adjusting the junction temperature.
Figure 7 shows the reverse torque mode select function table. If
you want the former braking style (the reverse braking), please
select only the REVERSE BRAKING mode [MODE1 = LOW or
OPEN and MODE2 = HIGH]. But the heat loss will be larger, and
SHORT BRAKING
(
2
)
BRAKING MODE (ECR < EC) SELECT FUNCTION TABLE
MODE1
LOW or OPEN
ALL SHORT
BRAKING
COMMUTATED SHORT
BRAKING
REVERSE BRAKING
LOW
or
OPEN
HIGH
OUTPUT OPEN
[only inertia]
HIGH
MODE2
Figure 7.
sometimes external heat sink would be necessary.
If it is possible to get ports more than two from µcom, you can
flexibly control the four kinds of BRAKING MODE. So the heat loss
can be half as usual. For example, the REVERSE BRAKING
MODE is on under the CLV control, and the ALL SHORT
BRAKING MODE is for seeking. When the motor should be
stopped, the ALL SHORT BRAKING MODE or the REVERSE
BRAKING MODE is available.
If you can only get one port, you can control only the MODE2. At
this time, you can control the two kinds of BRAKING MODE
[commutated short or reverse] on condition that the MODE1 is set
to be LOW or OPEN.
SPINDLE MOTOR DRIVER
M56784FP
MITSUBISHI <CONTROL / DRIVER IC>
REVERSE TORQUE MODE SELECT FUNCTION
Figure 8 shows an example for the reverse torque mode select.
The CASE1 is an example for controlled REVERSE and
COMMUTATED SHORT BRAKING.
The CASE2 is an example for controlled REVERSE and ALL
SHORT BRAKING.
2.
V
EC PIN INPUT VOLTAGE [ECR VOLTAGE = 2.5V]
E
R
REVERSE AND COMMUTATED
SHORT BRAKING SELECT
.
V
2.
V
.
V
0
V
FORWARD
CURRENT
REVERSE
TORQUE
CURRENT
M
O
T
O
R
CU
RRENT
[
R
se
n
se
=
0
.
5
o
hm
]
+1A
-1A
MOTOR
STOP
M
O
DE2
M
O
DE1
L
O
W
L
O
W
HI
G
H
BRAKING
MODE
Commu-
tated short
BRAKING
REVERSE
BRAKING
+
600
mA
-
600
mA
FORWARD
CURRENT
REVERSE
TORQUE
CURRENT
M
O
T
O
R
CU
RRENT
+1A
-1A
MOTOR
STOP
M
O
DE2
M
O
DE1
L
O
W
L
O
W
HI
G
H
BRAKING
MODE
ALL
SHORT
BRAKING
REVERSE
BRAKING
+
600
mA
-
600
mA
(
V
be
mf-V
d
-V
sa
t
)
/
R
a
V
d
;
d
i
ode
v
o
lt
age
V
sa
t ; npn tr
a
n
s
i
s
t
o
r
sa
t
u
r
a
ti
o
n v
o
lt
age
Ra ; motor inner resistance
2.
V
EC PIN INPUT VOLTAGE [ECR VOLTAGE = 2.5V]
E
R
.
V
2.
V
.
V
0
V
CASE 1
REVERSE AND ALL SHORT BRAKING SELECT
CASE 2
Figure 8.
SPINDLE MOTOR DRIVER
M56784FP
MITSUBISHI <CONTROL / DRIVER IC>
BASICALLY CHARACTERISTICS This data is an example for typical sample.
1.0
1.5
3.5
4.0
5.0
200 400 600 800 1000
0
0
Output saturation voltage and Load current Characteristics. (At bootstrap)
By taking advantage of bootstrap function, the output saturation voltage can be lower.
(Condition VCC2 = 6V, Vm = 5V, VCC = 5V)
Output Voltage (V)
Load current
(
mA
)
Top side
saturation voltage
Bottom side
saturation voltage
This device can use this voltage value
due to motor drive.
4.5
0.5
1200
0.07 0.13 0.25
0.38
0.32
0.49 0.62 0.76
0.06 0.12 0.23
0.29 0.35 0.47 0.62
0.83
1.0
1.5
10.5
11.0
12.0
200 400 600 800 1000
0
0
Output saturation voltage and Load current Characteristics. (Condition VCC2 = Vm = 12V, V CC = 5V)
Output Voltage (V)
Load current
(
mA
)
This device can use this voltage value
due to motor drive.
11.5
0.5
1200
0.76 0.79 0.86 0.91 0.98 1.05
1.18
0.89
0.07 0.13 0.25
0.38
0.32
0.49 0.62 0.76
Top side
saturation voltage
Bottom side
saturation voltage
SPINDLE MOTOR DRIVER
M56784FP
MITSUBISHI <CONTROL / DRIVER IC>
HB terminal voltage and Hall current characteristics.
(Condition : Vcc = 4.4V – 7V)
010 20 30 40 50
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
Hall current
(
mA
)
HB terminal voltage (V)
0.85
SPINDLE MOTOR DRIVER
M56784FP
MITSUBISHI <CONTROL / DRIVER IC>
APPLICATION CIRCUIT
Start / Stop
Hv
Hw
Hall bias
resistor
Hu
Control
PWM1
5V
Power
Suppl
y
Motor current sense resistor
12V
Motor
power
suppl
y
+-
+
-
TSD
Vlim
3 2
20 19 18 17 16 15
28
26 25
41 245
23
V/I Converter
I / I
Converter
27
FG
RDS
39
40
+
7SENSE
6
37
36
38
BRAKING
MODE
CHANGE
0 to 1.5
104
104
104
8 to 14 and 29 to 35
0.5
10uF
10uF
5V
104
Reference
PWM2
+-
120°
MATRIX
4
Hall
Bias
+-
µ
com control
BRAKING
MODE
SELECT
Forward reverse
rotation signal FG signal