Mitsubishi M56784FP Datasheet
MITSUBISHI <CONTROL / DRIVER IC>
M56784FP
SPINDLE MOTOR DRIVER
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.
PIN CONFIGURATION (TOP VIEW)
N.C
MODE3
MODE4
GND
Hw-
Hw+
HvHv+
Hu-
Hu+
N.C
1
W
2
V
3
U
4
R
S
7
8
9
10
11
12
13
14
15 28
16
17
18
19
20
21 22
42
41
40
39
385
376
36
35
34
M56784FP
33
32
31
30
29
27
26
25
24
23
N.C
S/S
RDS
FG
I
C
MODE2
MODE1
GND
VM
V
CC2
EC
ECR
VCC1
HB
N.C
BLOCK DIAGRAM
28
VM
VCC2
27
MODE1
MODE2
MODE4 7
MODE3
FG
RDS
36
BRAKING
MODE
CHANGE
37
SENSE
6
FG
39
RDS
40
UV
4 3 2
120°
MATRIX
+- +- +-
20 19 18 17 16 15
Hv+
Hu-
Hv- Hw+ Hw-
W VCC1
S/S
41 245
I/I
Converter
TSD
Hall
Bias
23
HB
38
CI
Outline 42P9R-D
S
R
-
+
+
V/I Converter
26 25
EC
N.C: no connection
Vref
8 to 14
GND
29 to 35
GND
ECRHu+
PIN DESCRIPTION
(c)
MITSUBISHI <CONTROL / DRIVER IC>
M56784FP
SPINDLE MOTOR DRIVER
Symbol FunctionPin No.
1
2
3
4
5
6
7
8 14
–
15
16
17
18
19
20
21
N.C
W Motor drive output W
V Motor drive output V
U Motor drive output U
S Motor current sense
R
MODE3 Automatic stop select
MODE4 Hall amplifier sensitivity select
GND
GND
Hw- Hw- Sensor amp. input
Hw+ Hw+ Sensor amp. input
Hv- Hv- Sensor amp. input
Hv+ Hv+ Sensor amp. input
Hu- Hu- Sensor amp. input
Hu+ Hu+ Sensor amp. input
N.C
—
—
*Pull-up resistors (10kohm) are included in the circuits connected to pin[RDS] and pin[FG].
Pin No.
22
23
24
25
26
27
28
29 35
–
36
37
38
39
40
41
42
24 25
Symbol
N.C —
Bias for Hall SensorHB
CC1 5V supply voltage
V
ECR The reference voltage for EC
EC Motor speed control
CC2 12V supply voltage
V
VM Motor supply voltage
GND GND
MODE1 Reverse torque mode select 1
MODE2 Reverse torque mode select 2
I Phase Compensation
C
FG Frequency generator output
RDS Reverse detected signal
S/S Start / Stop
ABSOLUTE MAXIMUM RATING (Ta = 25°C)
Symbol Conditions UnitsParameter
VM Motor supply voltage pin 16
VCC2
V
CC1
Io
VH
Pt
Kθ
Tj
Topr
Output current
Sensor amp.
Differential input range
Power dissipation
Thermal derating
Junction temperature
Operating temperature
Tstg Storage temperature
*Note1. The ICs must be operated within the Pt (power dissipation) or the area of safety operation.
28
27
24
pin
*note 1
– pins
15 20
Free Air
Free Air
-20 – +75
-40 – +125
Function
—N.C
Rating
4.5
1.2
9.6
150
V
V12V supply voltage pin 16
V5V supply voltage 7.0
A1.5
V
W
mW/°C
°C
°C
°C
MITSUBISHI <CONTROL / DRIVER IC>
y
y
M56784FP
SPINDLE MOTOR DRIVER
RECOMMENDED OPERATING CONDITIONS
Symbol
CC1 5V Power supply
V
CC2 V
VM
Io
12V Power supplyV
Motor Power supply
Output drive current
Parameter
Min.
4.5
4.5
4.5
—
Limits
p. Max.
T
5.0
12.0
12.0
—
5.5
13.2
13.2
700
ELECTRICAL CHARACTERISTICS (VCC=5V, VCC2=12V ,VM=12V, Ta=25°C unless otherwise noted.)
Symbol Conditions UnitsParameter
CC1 Sleep Mode Supply current - 1 and pin total Input Current
I
ICC2
ICC3
Vsat
ECdead-
ECdead+
ECR
EC
Gio
Vlim
VH com
VHmin1
VHmin2
VHb
Sleep Mode Supply current - 2
Supply current - 3
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
28 27
41
( pin low or open)
24
pin Input Current ( pin low or open)
24
pin Input Current (EC = ECR = 2.5V)
41
[ pin High]
41
Top and Bottom saturation voltage
(Load current: 500mA)
EC < ECR
EC > ECR
pin [3.3V DSP available]
25
26
pin [3.3V DSP available]
Io = Gio / Rsense [A/V]
Ilim = Vlim / Rsense [A]
15 20
– pins
15 20
– pins
MODE4 = OPEN or HIGH
MODE4 = GND
Load current (IHb) 10mA.
Units
V
V
mA
Min.
—
—
—
—
-40
0
0.5
0.5
0.25
0.27
1.2
50
35
0.6
Limits
p.
T
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
µA
µA
mA
V
mV
V
V
V/V
V
V
mVp-p
V
IHb
Von
Voff
V
iH
ViL
VOL
Hall bias terminal sink current
Motor start voltage
Motor stop voltage
Mode pin input high voltage
Mode pin input low voltage
40 39
pin[RDS], pin[FG]
output low voltage
41
pin input voltage when it starts up the motor.
*The IC is in the active condition.
*The hall bias is available.
41
pin input voltage when it stops the motor.
*The IC is in the sleep condition.
*The hall bias is off.
36 37 6
pin [MODE1], pin [MODE2], pin [MODE3]
7
and pin [MODE4] input voltage
when they are HIGH.
36 37 6
pin [MODE1], pin [MODE2], pin [MODE3]
7
and pin [MODE4] input voltage
when they are LOW.
Io current = 1mA
—
2.0
—
2.0
—
—
—
—
—
—
—
—
30
—
0.8
—
0.8
0.5
mA
V
V
V
V
V
ELECTRICAL CHARACTERISTICS
(W)
(VCC1=5V, VCC2=12V, VM=12V, Ta=25°C Unless otherwise noted.)
Reverse Torque
Current limit
MITSUBISHI <CONTROL / DRIVER IC>
M56784FP
SPINDLE MOTOR DRIVER
0 – +40mV
0.6A/V
Forward Torque
0
0.6A/V
EC - ECR
0 – -40mV
Current limit
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.
Figure 1. The characteristics of the control voltage and motor current (Torque).
THERMAL DERATIN G
6.0
4.1W using H-type board
5.0
Power Dissipation (Pdp)
3.1W using I-type board
4.0
2.9W using J-type board
3.0
2.0
1.0
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.
0 25 50 75 100 125 150
Ambient Temperature Ta ( )
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