Mitsubishi M56785FP Datasheet

MITSUBISHI <CONTROL / DRIVER IC>

M56785FP

SPINDLE MOTOR DRIVER

DESCRIPTION

The M56785FP is a semiconductor integrated circuit in order to
drive the spindle motor.

FEATURES

●Large power dissipation (Power Package).

●3.3V DSP available.

●The supply voltage with wide range.

●High motor drive current .

●Low saturation voltage. (typical 1.2V at load current 500mA)

●Motor current control for both motor torque directions.

●Reverse torque mode select [SHORT BRAKING,etc].

●Sleep mode. (Zero total current )

●Hall amplifier sensitivity select.

(Minimum voltage : 35mVp-p or 50mVp-p)

●FG signal output terminal.

●Automatic stop select. (Removable function)

●Reverse detected signal pin.

APPLICATION

CD-ROM,DVD,DVD-ROM,DVD-RAM etc.

PIN CONFIGURATION (TOP VIEW)

N.C

S/S

RDS

FG

MODE2
MODE1

GND

VM

CC2

V

EC
ECR
VCC1

HB

N.C

1
2
3
4

CI

7
8

M56785FP

13
14
15 28
16
17
18
19
20
21

Outline 42P9R-A

N.C

42

W

41

V

40

U

39

RS

385

MODE3

376

MODE4

36
35
349
3310
3211

GND

3112
30
29

Hw­Hw+

27

Hv-

26

Hv+

25

Hu-

24

Hu+

23

N.C

22

N.C: no connection

BLOCK DIAGRAM

15

VM

VCC2

16

FG

RDS

7

6

36

37

4

3

BRAKING
MODE
CHANGE

SENSE

FG
RDS

MODE1

MODE2

MODE4

MODE3

UV

39 40 41

120°

MATRIX

+ -+-+-

23

24 25 26 27 28

Hv+ Hv-

Hu-

Hu+

W

Hw+

Hw-

S/S

2 38

I / I

Converter

TSD

Hall
Bias

5

HB

CI

S

R

-

+
+

1720

EC ECR

Vref

V/I Converter

18

VCC1

19

8 to 14 29 to 35

GND

GND

PIN DESCRIPTIO N

MITSUBISHI <CONTROL / DRIVER IC>

M56785FP

SPINDLE MOTOR DRIVER

Pin No. Symbol Function

1
2
3
4
5
6
7

N.C
S/S
RDS
FG

I

C

Reverse detected signal
Frequency generator output
Phase Compensation

MODE1 Reverse torque mode select 1
GND GNDGND GND

15
16
17
18
19
20
21

CC2 12V supply voltage MODE3 Automatic stop select

V
EC R

V

CC1 V5V supply voltage Motor drive output V

Bias for Hall SensorHB W Motor drive output W

N.C N.C

* Pull-up resistors (10kohm) are included in the circuits connected to pin [RDS] and pin[FG].

Pin No. Symbol Function

22
23
24
25
26
27
28

29 –358 –14

36
37
38
39
40
41
42

N.C

Hu+ Sensor amp. inputHu+Start / Stop
Hu- Hu- Sensor amp. input
Hv+ Hv+ Sensor amp. input
Hv- Hv- Sensor amp. input
Hw+ Hw+ Sensor amp. inputMODE2 Reverse torque mode select 2
Hw- Hw- Sensor amp. input

Hall amplifier sensitivity selectVM Motor supply voltage MODE4

SMotor speed control Motor current sense

U Motor drive output UECR The reference voltage for EC

43

ABSOLUTE MAXIMUM RATING (Ta=25 )

Symbol Rating UnitParameter Conditions

VCC2 12V supply voltage 16 pin 16

CC1 5V supply voltage V7.019 pin

V
Io Output current 1.5 ANote 1

Sensor amp.
Differential input range

Pt Power dissipation W1.2Free Air
Kθ

Thermal derating mW/˚CFree Air 9.6
Tj Junction temperature
Topr Operating temperature -20 +75
Tstg Storage temperature

23 –28

pins

16 V15 pinVM Motor supply voltage

150

–

–

V

V4.5VH(c)

˚C
˚C
˚C-40 +125

*Note1 ; The ICs must be operated within the Pt (power dissipation) or the area of safety operation

MITSUBISHI <CONTROL / DRIVER IC>

M56785FP

SPINDLE MOTOR DRIVER

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter

Min. Typ. Max.

5V Power supply V5.04.5 5.5VCC1

ELECTRICAL CHARACTERISTICS (VCC=5V, VCC2=12V, VM=12V, Ta=25˚C unless otherwise noted.)

Symbol Parameter

Icc1

Icc2

Sleep Mode Supply
current- 1

Sleep Mode Supply
current- 2

Supply current- 3Icc3 pin Input Current (EC=ECR=2.5V) [ pin High] 6.0 mA
Vsat Saturation voltage
ECdead-

ECdead+
ECR pin [3.3v DSP available] 1.65 V0.5 4.0

EC

Dead Zone Control

voltage dead zone

Reference voltage

Input range

Control voltage Input

range

15 16 2

and pin total Input Current ( pin low or open) 0 100

19 2

pin Input Current ( pin low or open) 500

19

Top and Bottom saturation voltage.
(Load current :500mA)

EC < ECR
EC > ECR

18

17

pin [3.3v DSP available] 0.5 4.0 V

Gio Control gain Io = Gio / Rsense [A/V] 0.3 V/V0.350.25
Vlim Control limit Ilim = Vlim / Rsense [A] 0.3 0.330.27 V

VH com

Hall sensor amp

common mode input

23 – 28

pins

range
VHmin1

VHmin2 MODE4=GND 35
VHb

Hall sensor amp.

input signal revel

Hall bias terminal

output voltage

23 – 28

pins

Load current (IHb) =10 mA. V0.85 1.20.6

Hall bias terminal sink

current

2

Von

Motor start voltage

pin input voltage when it starts up the motor.
*The IC is in the active condition.
*The hall bias is available.

2

Voff

Motor stop voltage

pin input voltage when it stops the motor.
*The IC is in the sleep condition.
*The hall bias is off.

7 6 37

V

ViL

iH

mode pin input high
voltage

mode pin input low
voltage

pin[MODE1], pin[MODE2], pin[MODE3]

36

and pin[MODE4] input voltage
when they are HIGH.

7 6 37

pin[MODE1], pin[MODE2], pin[MODE3]

36

and pin[MODE4] input voltage
when they are LOW.

V

OL

3pin[RDS],4pin[FG]
output low voltage

Io current = 1mA 0.5 V

Conditions

2

MODE4=OPEN or HIGH

Limits

12.04.5VCC2 12V Power supply 13.2 V

Limits

Min. Typ. Max.

1.2 1.9 V

-40 -21 0
+400 +21

1.65

1.2 4.5 V

50

30IHb

2.0

0.8

2.0

0.8

Unit

V12.04.5 13.2Motor Power supplyVM

mA700Io Output drive current

Unit

µA

µA

mV

mV
p-p

mA

V

V

V

V

MITSUBISHI <CONTROL / DRIVER IC>

M56785FP

SPINDLE MOTOR DRIVER

ELECTRICAL CHARACTERISTICS (VCC1=5V, VCC2=12V, VM=12V, Ta=25˚C Unless otherwise noted. )

Reverse Torque

Current limit

0 – +40mV

0

0.6A/V

0 – -40mV

Current limit

Forward Torque

Figure 1. The characteristics of the control voltage

and motor current ( Torque ).

0.6A/V

The relationship between the EC-ECR (the difference
between EC<(control voltage> and ECR <reference
voltage> ) and the torque is shown in Figure 1.
The current gain is 0.6A/V (at sensing resistor :0.5ohm)
in both torque directions, and the dead zone is from
±0mV to ±40mV.
When the all short brake mode is selected, the coil
current under the reverse torque control depends on
the back emf. and the coil resistance.

EC - ECR

THERMAL DERATING

6.0
(W)

5.0

4.0

3.0

2.0

Power Dissipation (Pdp)

1.0

0 25 50 75 100 125

4.0W
using A-type board

3.0W
using B-type board

2.7W
using C-type board

Ambient Temperature Ta ( )

This IC's package is POWER-SSOP, so improving
the board on which the IC is mounted enables a
large power dissipation without a heat sink.
For example, using an 1 layer glass epoxy resin
board, the IC's power dissipation is 2.7W at least.
And it comes to 4.0W by using an improved 2 layer
board.
The information of the H, I, J type board is shown
in the board information.

150