MITSUBISHI <CONTROL / DRIVER IC>
M56733AFP
3-PHASE BRUSHLESS MOTOR CONTROL
DESCRIPTION
The M56733AFP is a semiconductor integrated circuit designed as
a single chip controller for the FDD spindle motor. The IC is
equipped with a power amplifier, hole amplifier, FG amplifier,
oscillator, speed discriminator, and various types of protection
circuits.
Equipped with MOD pin that enables 3-speed switching with a
single pin, the M56733AFP is very convenient to make system
compact.
PIN CONFIGURATION (TOP VIEW)
V
CC
HB
FG
IN–
FG
IN+
FG
Moni
EN
1
2
3
4
5
6
7
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
H
V+
H
V–
H
W+
H
W–
ERR
OUT
ERR
IN–
GND
U
V
W
H
U+
H
U–
R
F
FEATURES
qProvided
with digital servo enabling high precision, high stability
and non-adjustment.
q3-speed
switching function with a pin .................................. MOD
q
Enable two systems .......................................................... EN•EN
qI
O
(peak)=1.0A
qLow
capacitance of dumping capacitor
EN
OSC
IN
GND
8
9
10
11
12
13
14
15
M56733AFP
APPLICATION
FDD spindle motor (5")
OSC
OUT
MOD 16
FLT
17
18
RECOMMENDED OPERATING CONDITIONS
Supply voltage ................................................. 10.8 – 12.0 – 13.2 V
Oscillation frequency .......................................................... 492 kHz
Maximum output current ..................................................... 800 mA
FG amplifier input signal level .............................. 5 mVp-p or more
DSC
OUT
Outline 36P2R-D
BLOCK DIAGRAM
U
36
R
F
31
V
35
W
34
FLT
17
ERR
OUT
20
ERR
IN
(–)
19
DSC
OUT
18
7
V
REF
ERR
OVSD
CTL
12
GND
25
30
V
CC
1
LOGIC
TSD
1/N
16 MOD
EN
CONTROL
OSC
FG
33
32
+ H
U
–
H
U
24
23
+ H
V
–
H
V
22
21
+ H
W
–
H
W
2
Hall
Bias
6
EN
13
EN
3
4
– FG+
FG
5
FG
(Monitor)
14
15
OSC
IN
OSC
OUT
–
V
REF
DISCRIMINATOR
–
MITSUBISHI [ MITSUBISHI ELECTRIC SEMICONDUCTOR ]
