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PDF M56784 Data sheet ( Hoja de datos )
| Número de pieza | M56784 | |
| Descripción | SPINDLE MOTOR DRIVER | |
| Fabricantes | Mitsubishi | |
| Logotipo |  |
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MITSUBISHI <CONTROL / DRIVER IC>
M56784FP
SPINDLE MOTOR DRIVER
DESCRIPTION
The M56784FP is a semiconductor integrated circuit in order to
drive the spindle motor.
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.
APPLICATION
CD-ROM, DVD, DVD-ROM, DVD-RAM etc.
PIN CONFIGURATION (TOP VIEW)
N.C
W
V
U
RS
MODE3
MODE4
GND
Hw-
Hw+
Hv-
Hv+
Hu-
Hu+
N.C
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
42 N.C
41 S/S
40 RDS
39 FG
38 CI
37 MODE2
36 MODE1
35
34
33
32 GND
31
30
29
28 VM
27 VCC2
26 EC
25 ECR
24 VCC1
23 HB
22 N.C
Outline 42P9R-D
N.C: no connection
BLOCK DIAGRAM
UVW
432
S/S
41
RS
5
VCC1
24
VM 28
VCC2 27
MODE1 36
MODE2 37
BRAKING
MODE
CHANGE
120°
MATRIX
I/I
Converter
MODE4 7
SENSE
MODE3 6
FG 39
RDS 40
FG
RDS
+-
+-
TSD
+-
Hall
Bias
20 19
Hu+ Hu-
18 17
Hv+ Hv-
16 15
Hw+ Hw-
23 38
HB CI
Vref
V/I Converter
26 25
EC ECR
GND
GND
1 page  
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.
Hall
inputs
Output
current
Hw+
Hv+
Hu+
V U WV
Hall elements
V
U
SOURSE
W
U
V
W
V
W
U
U
W
V
UW
V
SINK
UW
FORWARD
EC < ECR
Figure 2.
Outer loator
REVERSE
EC > ECR
HALL AMPLIFIER INPUT SENSITIVITY SELECT
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.
Figure 3.
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.
SLEEP MODE FUNCTION
START / STOP ( 41 pin)
LOW or OPEN
HIGH
Motor Stop
Bias off
Hall-Bias off
Motor on
Bias on
Hall-Bias on
Figure 4.
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.
5 Page 
APPLICATION CIRCUIT
Forward reverse
rotation signal
FG signal
5V
Hall bias
resistor
Hu
Hv
Hw
104
Control
PWM1
Reference
PWM2
MITSUBISHI <CONTROL / DRIVER IC>
M56784FP
SPINDLE MOTOR DRIVER
µcom control
BRAKING
MODE
SELECT
0 to 1.5
10uF
12V
Motor
power
supply
104
104
104
++ -
8 to 14 and 29 to 35
Start / Stop
Motor current sense resistor
0.5
10uF
5V
Power
Supply
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet M56784.PDF ] | |
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