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PDF M56755AFP Data sheet ( Hoja de datos )
| Número de pieza | M56755AFP | |
| Descripción | SPINDLE MOTOR DRIVER | |
| Fabricantes | Mitsubishi | |
| Logotipo |  |
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MITSUBISHI <CONTROL / DRIVER IC>
M56755AFP
SPINDLE MOTOR DRIVER
DESCRIPTION
The M56755AFP is a semiconductor integrated circuit designed for
a single chip controller for CD-ROM spindle motor.
M56755AFP has a both (forward and reverse) motor torque control
by the motor speed control terminal.
M56755AFP has the several braking mode that an user can flexibly
select in order to generate the reverse torque. Also, this device
includes a bias circuit for Hall Sensor, a current limit circuit and a
thermal shut down function.
FEATURES
q 3.3V DSP available.
q The supply voltage with wide range.
(4.5V to 13.2V)
q High motor drive current (1.2A).
q Motor current control for the both motor torque is possible.
q Reverse torque mode select [SHORT BRAKING, etc]
q Sleep mode
q Hall amplifier sensitivity select
q Automatic stop select (with reverse detected signal pin)
APPLICATION
Above 8 times speed CD-ROM, DVD, DVD-ROM etc.
PIN CONFIGURATION (TOP VIEW)
S/S
RDS
FG
CI
MODE2
MODE1
GND
VM
VCC2
EC
ECR
VCC1
HB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
36 W
35 V
34 U
33 RS
32 MODE3
31 MODE4
30
29
28
GND
27
26
25
24 Hw-
23 Hw+
22 Hv-
21 Hv+
20 Hu-
19 Hu+
Outline 36P2R-D
BLOCK DIAGRAM
U VW
34 35 36
S/S
1
RS
33
VCC1
17
VM 13
VCC2 14
MODE1 6
MODE2 5
BRAKING
MODE
CHANGE
120°
MATRIX
I/I
Converter
MODE4 31 SENSE
MODE3 32
FG 3
RDS 2
FG
RDS
TSD
+-
+-
+-
Hall
Bias
19 20
Hu+ Hu-
21 22
Hv+ Hv-
23 24
Hw+ Hw-
18
HB
4
CI
Vref
V/I Converter
15 16
EC ECR
GND
GND
1 page  
HALL AMPLIFIER INPUT AND COMMUTATION
The relationship between the hall amplifier inputs voltage and the
motor current outputs is as shown in Figure 2.
MITSUBISHI <CONTROL / DRIVER IC>
M56755AFP
SPINDLE MOTOR DRIVER
Hall
inputs
Output
current
Hw+
Hv+
Hu+
V U WV
Hall elements
V
U
SOURSE
W
U
V
W
U
W
V
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
will be shape.
The hall amp
input voltage
minimum is
50mVp-p.
The hall amp
input voltage
minimum is
35mVp-p.
Figure 3.
Figure 3 shows the hall amplifier input sensitivity select function.
An user is able to select the sensitivity of a hall amplifier to match
with the hall elements type.
If the output minimum level of a hall elements is a low level as
below 50mVp-p, please connect the MODE4 to GND at external.
In this case, the output current will be shape. If the output minimum
level of a hall elements is more higher than 50mVp-p, please make
the MODE4 to open, then the output current will be commutated
softly.
We recommend that the output level of a hall element is used for
80mVp-p to 120mVp-p and the MODE4 is made to open.
SLEEP MODE FUNCTION
START / STOP
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 1 pin [S/S] is set to
open or low, the current output will be high impedance and then
the motor will be stop. Also, the IC bias current wil be a slight
current (please make reference the electrical characteristics). At
the same time, the hall bias output will be cut off. When the 1 pin
goes high, the all of circuits will be available.
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet M56755AFP.PDF ] | |
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