3-PHASE BRUSHLESS MOTOR CONTROL

M56733AFP

MITSUBISHI <CONTROL / DRIVER IC>

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.

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

qLow capacitance of dumping capacitor

APPLICATION

FDD spindle motor (5")

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

BLOCK DIAGRAM

PIN CONFIGURATION (TOP VIEW)

Outline 36P2R-D

36

33

34

35

1

4

3

2

32

5

31

6

28

9

27

10

26

11

25

12

13

14

24

23

7

8

30

29

15

22

16

21

17

20

18

19

GND

HB

MOD

EN

EN

FLT

GND

U

V

W

31

36

U

35

V

34

W

33

32

24

23

22

21

3

FG–

4

FG+

LOGIC

TSD

FG

CTL

OVSD

17

FLT

20

19

18

GND

16 MOD

2

Hall

Bias

6

EN

13

EN

5

FG

(Monitor)

14

15

OSC

1 / N

DISCRIMINATOR

ERR

EN

CONTROL

1

7

12

25

30