MITSUBISHI <CONTROL / DRIVER IC>
M56784FP
SPINDLE MOTOR DRIVER
DESCRIPTION
The M56784FP is a semiconductor integrated circuit in order to
drive the spindle motor.
PIN CONFIGURATION (TOP VIEW)
N.C
W
V
U
R
S
MODE3
MODE4
1
2
3
4
5
6
7
8
9
42
41
40
39
38
37
36
35
34
N.C
S/S
RDS
FG
C
I
MODE2
MODE1
FEATURES
q
Large power dissipation (Power Package).
q
3.3V DSP available.
q
The supply voltage with wide range.
q
High motor drive current.
q
Low saturation voltage. (typical 1.2V at load current 500mA)
q
Motor current control for both motor torque directions.
q
Reverse torque mode select [SHORT BRAKING, etc].
q
Sleep mode. (Zero total current)
q
Hall amplifier sensitivity select.
(Minimum voltage: 35mVp-p or 50mVp-p)
q
FG signal output terminal.
q
Automatic stop select. (Removable function)
q
Reverse detected signal pin.
M56784FP
10
GND
33
32
31
30
29
28
27
26
25
24
23
22
VM
V
CC
2
EC
ECR
VCC1
HB
N.C
GND
11
12
13
14
APPLICATION
CD-ROM, DVD, DVD-ROM, DVD-RAM etc.
Hw-
Hw+
Hv-
Hv+
Hu-
Hu+
N.C
15
16
17
18
19
20
21
Outline 42P9R-D
N.C: no connection
BLOCK DIAGRAM
U
4
V
3
W
2
S/S
41
R
S
5
V
CC
1
24
VM
V
CC
2
28
-
27
++
Vref
8 to 14
MODE1
36
MODE2
37
BRAKING
MODE
CHANGE
120°
MATRIX
SENSE
TSD
I/I
Converter
GND
29 to 35
GND
MODE4
7
MODE3
FG
RDS
6
39
40
20
Hu+
19
Hu-
18
Hv+
17
Hv-
16
Hw+
15
Hw-
23
HB
C
I
38
FG
RDS
+
-
+
-
+
-
Hall
Bias
V/I Converter
26
EC
25
ECR
MITSUBISHI <CONTROL / DRIVER IC>
M56784FP
SPINDLE MOTOR DRIVER
PIN DESCRIPTION
Pin No.
1
2
3
4
5
6
7
8
Symbol
N.C
W
V
U
R
S
MODE3
MODE4
GND
Hw-
Hw+
Hv-
Hv+
Hu-
Hu+
N.C
Function
—
Motor drive output W
Motor drive output V
Motor drive output U
Motor current sense
Automatic stop select
Hall amplifier sensitivity select
GND
Hw- Sensor amp. input
Hw+ Sensor amp. input
Hv- Sensor amp. input
Hv+ Sensor amp. input
Hu- Sensor amp. input
Hu+ Sensor amp. input
—
24
Pin No.
22
23
24
25
26
27
28
29
Symbol
N.C
HB
V
CC
1
ECR
EC
V
CC
2
VM
GND
MODE1
MODE2
C
I
FG
RDS
S/S
N.C
Function
—
Bias for Hall Sensor
5V supply voltage
The reference voltage for EC
Motor speed control
12V supply voltage
Motor supply voltage
GND
Reverse torque mode select 1
Reverse torque mode select 2
Phase Compensation
Frequency generator output
Reverse detected signal
Start / Stop
—
–
14
15
16
17
18
19
20
21
–
36
37
38
39
40
41
42
35
*Pull-up resistors (10kohm) are included in the circuits connected to
pin[RDS] and
25
pin[FG].
ABSOLUTE MAXIMUM RATING
(Ta = 25°C)
Symbol
VM
V
CC
2
V
CC
1
Io
VH(c)
Pt
Kθ
Tj
Topr
Tstg
Parameter
Motor supply voltage
12V supply voltage
5V supply voltage
Output current
Sensor amp.
Differential input range
Power dissipation
Thermal derating
Junction temperature
Operating temperature
Storage temperature
pin
27
pin
24
pin
*note 1
28
15
Conditions
Rating
16
16
7.0
1.5
Units
V
V
V
A
V
W
mW/°C
°C
°C
°C
–
20
pins
4.5
1.2
9.6
150
-20 – +75
-40 – +125
Free Air
Free Air
*Note1. The ICs must be operated within the Pt (power dissipation) or the area of safety operation.
MITSUBISHI <CONTROL / DRIVER IC>
M56784FP
SPINDLE MOTOR DRIVER
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
1
V
CC
2
VM
Io
Parameter
5V Power supply
12V Power supply
Motor Power supply
Output drive current
Min.
4.5
4.5
4.5
—
Limits
Typ.
5.0
12.0
12.0
—
Max.
5.5
13.2
13.2
700
Units
V
V
V
mA
ELECTRICAL CHARACTERISTICS
(V
CC
=5V, V
CC
2=12V ,VM=12V, Ta=25°C unless otherwise noted.)
Symbol
I
CC
1
I
CC
2
I
CC
3
Parameter
Sleep Mode Supply current - 1
Sleep Mode Supply current - 2
Supply current - 3
Conditions
28
and
27
pin total Input Current
(
41
pin low or open)
Min.
—
—
—
—
-40
0
0.5
0.5
0.25
0.27
1.2
Limits
Typ.
0
—
—
1.2
-21
+21
1.65
1.65
0.3
0.3
—
—
—
0.85
—
Max.
100
500
6.0
1.9
0
+40
4.0
4.0
0.35
0.33
4.5
—
—
1.2
30
Units
µA
µA
mA
V
mV
V
V
V/V
V
V
mVp-p
V
mA
pin Input Current (
41
pin low or open)
24
pin Input Current (EC = ECR = 2.5V)
[
41
pin High]
Top and Bottom saturation voltage
(Load current: 500mA)
EC < ECR
EC > ECR
25
pin [3.3V DSP available]
26
pin [3.3V DSP available]
Io = Gio / Rsense [A/V]
Ilim = Vlim / Rsense [A]
15
24
Vsat
ECdead-
ECdead+
ECR
EC
Gio
Vlim
VH com
VHmin1
VHmin2
VHb
IHb
Saturation voltage
Control voltage dead zone
Reference voltage Input range
Control voltage Input range
Control gain
Control limit
Hall senser amp. common
mode input range
Hall sensor amp.
input signal revel
Hall bias terminal output
voltage
Hall bias terminal sink current
–
–
20
pins
pins
MODE4 = OPEN or HIGH
15
20
MODE4 = GND
50
35
0.6
—
Load current (IHb) 10mA.
41
Von
Motor start voltage
41
pin input voltage when it starts up the motor.
*The IC is in the active condition.
*The hall bias is available.
pin input voltage when it stops the motor.
*The IC is in the sleep condition.
*The hall bias is off.
2.0
—
—
V
Voff
Motor stop voltage
36
—
—
0.8
V
V
iH
Mode pin input high voltage
pin [MODE1],
37
pin [MODE2],
6
pin [MODE3]
and
7
pin [MODE4] input voltage
when they are HIGH.
pin [MODE1],
37
pin [MODE2],
6
pin [MODE3]
and
7
pin [MODE4] input voltage
when they are LOW.
36
2.0
—
—
V
V
iL
Mode pin input low voltage
40
pin[RDS],
39
pin[FG]
output low voltage
—
—
0.8
V
V
OL
Io current = 1mA
—
—
0.5
V
MITSUBISHI <CONTROL / DRIVER IC>
M56784FP
SPINDLE MOTOR DRIVER
ELECTRICAL CHARACTERISTICS
(V
CC
1=5V, V
CC
2=12V, VM=12V, Ta=25°C Unless otherwise noted.)
Reverse Torque
Current limit
0 – +40mV
0.6A/V
0
EC - ECR
0.6A/V
0 – -40mV
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.
Current limit
Forward Torque
Figure 1. The characteristics of the control voltage and motor current (Torque).
THERMAL DERATING
6.0
(W)
5.0
3.1W using I-type board
Power Dissipation (Pdp)
4.0
2.9W using J-type board
3.0
4.1W using H-type board
2.0
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.
1.0
0
25
50
75
100
)
125
150
Ambient Temperature Ta (
MITSUBISHI <CONTROL / DRIVER IC>
M56784FP
SPINDLE MOTOR DRIVER
HALL AMPLIFIER INPUT AND COMMUTATION
The relationship between the hall amplifier inputs voltage and the motor current outputs is shown in Figure 2.
Hw+
Hall
inputs
V
U
Hv+
Hu+
Hall elements
V
U
U
Outer loator
W
V
U
U
W
V
REVERSE
EC > ECR
W
V
SOURSE
W
V
W
Output
current
SINK
U
W
V
U
W
FORWARD
EC < ECR
Figure 2.
HALL AMPLIFIER INPUT SENSITIVITY SELECT
MODE4
OPEN or HIGH
120 degree
soft switching
The hall amp
minimum input
voltage is
50mVp-p.
GND
120 degree switching
** Io current
changes sharply.
The hall amp
minimum input
voltage is
35mVp-p.
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.
SLEEP MODE FUNCTION
START / STOP (
41
pin)
LOW or OPEN
HIGH
Figure 4 shows the sleep mode function. If the
41
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
41
pin input is high, all the circuits
will work.
Motor Stop
Bias off
Hall-Bias off
Motor on
Bias on
Hall-Bias on
Figure 4.
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