MITSUBISHI <CONTROL / DRIVER IC>
M56745FP
SPINDLE MOTOR DRIVER
DESCRIPTION
The M56745FP is a semiconductor integrated circuit designed for a
single chip controller for CD-ROM spindle motor.
M56745FP has a both (forward and reverse) motor rotation control
by the motor speed control terminal.
Also, this device includes a bias circuit for Hall Sensor, a current
limit circuit and a thermal shut down function.
PIN CONFIGURATION (TOP VIEW)
S/S
1
2
3
N.C
4
5
36
35
34
33
32
31
30
29
28
GND
27
26
25
24
23
22
21
20
19
Hw-
Hw+
Hv-
Hv+
Hu-
Hu+
W
V
U
Rs
Rnf
M.GND
FEATURES
qThe
supply voltage with wide range.
(4.5V to 13.2V)
qHigh
motor drive current (1.0A).
qMotor
current control for the both motor rotation is possible.
GND
6
7
8
9
10
11
M56745FP
APPLICATION
CD-ROM
VM
C
I
EC
ECR
Vcc
Hb
12
13
14
15
16
17
18
Outline 36P2R-D
N.C: No connection
BLOCK DIAGRAM
U
34
V
35
W
36
S/S
1
Rs
33
Rnf
32
M.Gnd
31
Vcc
17
VM 13
Vref
+
-
I/I
converter
120˚
MATRIX
GND
TSD
V/I converter
Hall
+
-
+
-
+
-
Bias
19
Hu+
20
Hu-
21
Hv+
22
Hv-
23
Hw+
24
Hw-
18
Hb
14
C
I
15
EC
16
ECR
MITSUBISHI [ MITSUBISHI ELECTRIC SEMICONDUCTOR ]
