Datasheet M56787FP Datasheet (Mitsubishi)

MITSUBISHI <CONTROL / DRIVER IC>

)

M56787FP

SPINDLE MOTOR DRIVER

DESCRIPTION

The M56787FP is a semiconductor integrated circuit in order to
drive the spindle motor.

FEATURES

●Low motor echo noise.

●3.3V DSP available.

●Large power dissipation package(Power Package).

●High motor drive current .

●Wide dynamic range.

●Motor current control for both motor torque directions.

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

●Sleep mode.

●FG signal output terminal.

●FG pulse select.

●Automatic stop.

APPLICATION

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

PIN CONFIGURATION(TOP VIEW

N.C
N.C

S/S

FGS

FG

CI

BRS

GND

13
14

R

S

15 28

VCC2

16
17

EC

18 25

ECR

V

CC1

19

HB

20

N.C

21

1
2
3
4

7
8

Outline 42P9R-A

42
41
40
39
385
376
36
35
349

M56787FP

M56787FP

3310
3211
3112
30
29

27
26

24
23
22

N.C
N.C

W
V
U
MGND

TP

GND

Hw­Hw+

Hv­Hv+
Hu-

Hu+
N.C

N.C: no connection

BLOCK DIAGRAM

CI

6

15

RS

16

VCC2

BRS

FG

FGS

7

5

4

BRAKING
MODE
CHANGE

REVERSE
DETECT

FG
&
SELECT

CURRENT
SENSE & LIMIT

U

38 39 40

+

-

23 24 25 26 27 28

V

120˚

MATRIX

+

W

+

-

-

MGND

37

TSD

HALL
BIAS

20

HB

S/S

3

36

TP

VCC1

19

CONTROL

17 18

EC ECRHu+ Hu- Hv+ Hv- Hw+ Hw-

8 to 14

29 to 35

1

2

21

22

41

42

GND

GND

N.C

N.C

N.C

N.C
N.C

N.C

MITSUBISHI <CONTROL / DRIVER IC>

M56787FP

SPINDLE MOTOR DRIVER

PIN DESCRIPTIONS

Pin No. Symbol Function

1 42

N.C

2

N.C

3
4

FGS FG pulse select

5

FG Frequency generator output

6

CI Phase Compensation

7

BRS Reverse torque mode select
GND

15
16
17
18
19
20
21

S

R
V

CC2 12V supply voltage

EC
ECR
V

CC1

HB
N.C

Start / Stop S/S

GND
Motor current sense

Motor speed control
The reference voltage for EC
5V supply voltage
Bias for Hall Sensor

* Pull-up resistors (10kohm) are included in the circuits connected to [FG] pin.
* Note1. The pin (TP) is test terminal. Please make an open the pin (TP).

ABSOLUTE MAXIMUM RATING (Ta=25˚C)

Symbol Rating Unit

R

S
CC2 12V supply voltage 16 V

V
VCC1

Motor supply voltage

5V supply voltage V

Io Output current 1.5 A
VH(c)
Pt

Kθ
Tj

Sensor amp.
Differential input range

Power dissipation
Thermal derating

Junction temperature
Topr Operating temperature -20 – +75
Tstg

Storage temperature

*Note2 ; The ICs must be operated within the Pt (power dissipation) or the area of safety operation

Parameter Conditions

15 pin
16 pin
19 pin

Note 2

23 – 28 pins

Free Air
Free Air

Pin No. Symbol Function

N.C

41
40
39
38
37
36

29 –358 –14

28
27
26
25
24
23
22

2424

N.C
W
V
U
MGND

TP
GND
Hw-

Hw+
Hv­Hv+
Hu­Hu+
N.C

Motor drive output W
Motor drive output V
Motor drive output U
Motor GND
Test
GND

Hw- Sensor amp. input
Hw+ Sensor amp. input
Hv- Sensor amp. input
Hv+ Sensor amp. input
Hu- Sensor amp. input
Hu+ Sensor amp. input

16 V

7.0

4.5

1.2

9.6

150

-40 – +125

Note1

V

W

mW/˚C

˚C
˚C
˚C

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter

CC1

V

CC2 12V Power supply V13.24.5 12.0

V

5V Power supply

Io Output drive current

Min. Typ. Max.

Limits

5.04.5 5.5

1000

Unit

V

mA

MITSUBISHI <CONTROL / DRIVER IC>

M56787FP

SPINDLE MOTOR DRIVER

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

Symbol Parameter

Isleep Sleep Mode Supply current

Supply currentIcc

Vsat Saturation voltage
ECdead-

ECdead+

Control voltage dead zone

ECR Reference voltage Input range
EC Control voltage Input range

CC1& VCC2 pin total Current

V

(at S/S pin low or open)

CC1& VCC2 pin total Current

V
(EC=ECR=1.5V) [S/S pin High]

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

EC < ECR
EC > ECR

18

pin [3.3V DSP available]

17

pin..[3.3V DSP available]

Conditions

Min. Typ. Max.

Gio Control gain Io = Gio / Rsense [A/V] 0.4 V/V0.460.34
Vlim Control limit Ilim = Vlim / Rsense [A] 0.3 0.330.27 V

VH com
VHmin Hall sensor amp. input signal level

Hall sensor amp
common mode input range

23 – 28

pins23 – 28

pins
VHb Hall bias terminal output voltage Load current (IHb) =10 mA.
IHb Hall bias terminal sink current

[S/S]pin input voltage when it starts up the motor.

Von

Motor start voltage

*The IC is in the active condition.
*The hall bias are available.

[S/S]pin input voltage when it stops the motor.

Voff

Motor stop voltage

*The IC is in the sleep condition.
*The hall bias are off.

V

iH1 3.6 VBRS input high voltage

ViM

BRS input middle voltage

BRS input voltage that the short braking is selected
when the reverse torque.

BRS input voltage that the free run is selected when
the reverse torque.

Note3.

BRS input voltage that the reverse braking is selected
when the reverse torque.

ViH2 2.0 VLogic input high voltage

V

VOL

iL2

Logic input
Low voltage

[FG] pin
output low voltage

[FGS] input voltage
when it is HIGH.

[FGS] input voltage
when it is LOW.

Io current = 1mA 0.5 V

Limits

10

10

1.2 1.9 V

-60 -30 0
+600 +30

0 3.3

1.65 V

1.650 3.3

1.3 4.4

2.0

0.8

0.8 VViL1 BRS input low voltage

0.8 V

Unit

µA

mA

mV

V

V

mVp-p60

V0.85 1.20.6

mA30

V

V

V2.21.6

*Note3. The ViM is the limit in case of external voltage input control. The free run mode is selected when the BRS pin is open, too.

THERMAL CHARACTERISTICS

Symbol Parameter Unit

TSD

Thermal Shut Down 165

Function start temperature of IC Function stop temperature of IC

Min. Typ. Max. Min. Typ. Max.

125

˚C

The relationshipwith I/O control and the brakingmode

MITSUBISHI <CONTROL / DRIVER IC>

M56787FP

SPINDLE MOTOR DRIVER

BRS=LOW

Figure 1.

BRS=Hi

Current limit

0 – +60mV

0.8A/V

Forward Torque

REVERSE BRAKING

Reverse Torque

0.8A/V

0

0 – -60mV

Current limit

SHORT BRAKING

Reverse Torque

EC - ECR

The braking mode is selected flexibly by using the BRS
terminal.
The relationship between the EC-ECR (the difference
between (EC<control voltage> and ECR <reference
voltage> ) and the torque is shown in Figure 1,2 and 3.
The current gain is 0.8A/V (at sensing resistor :0.5ohm)
in forward torque directions, and the dead zone is from
0mV to 60mV.
When the reverse brake mode(BRS=Lo) is selected,
the coil current gain under the reverse torque control is
the same with in forward torque directions.

Figure 2.

BRS=Open

Figure 3.

0.8A/V

Forward Torque

0.8A/V

Forward Torque

0

0

0 – -60mV

Current limit

FREE RUN

0 – -60mV

Current limit

EC - ECR

EC - ECR

When the short brake mode(BRS=Hi) is selected, the
coil current under the reverse torque control depends on
the back emf. and the coil resistance.

When the free run mode(BRS=open) is selected,
the coil current under the reverse torque control
(EC-ECR>0) becomes zero and in free run
situation.

THERMAL DERATI NG

MITSUBISHI <CONTROL / DRIVER IC>

M56787FP

SPINDLE MOTOR DRIVER

6.0
(W)

4.0W using H-type board

5.0

3.0W using I-type board

4.0

2.7W using J-type board

3.0

2.0

Power Dissipation (Pdp)

1.0

0 25 50 75 100 125 150

Ambient Temperature Ta (˚C)

HALL AMPLIFIER INPUT AND COMMUTATION

The relationship between the hall amplifier inputs voltage and the
motor current outputs is shown in Figure 4.

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.

Hall
inputs

Output
current

Figure 4.

Hw+

Hv+

U WV

Hu+

Hall elements

V

V

SOURSE

SINK

UVW WU

W

V

W

U

U

FORWARD

EC<ECR

U

Outer loator

W

V

U

W

V

REVERSE

EC>ECR

SLEEP MODE FUNCTION

START / STOP (S/S pin)

LOW or OPEN HIGH

Motor Stop

Bias off

Hall-Bias off

Figure 5.

Motor on

Bias on

Hall-Bias on

FG FUNCTION

FG pulse select (FGS pin)

LOW or OPEN HIGH

NX1 pulse NX3 pulse

Figure 6.

MITSUBISHI <CONTROL / DRIVER IC>

M56787FP

SPINDLE MOTOR DRIVER

Figure 5 shows the sleep mode function. If the [S/S] pin is set to be open or low,
the motor drive outputs have high impedance and the motor stops. Then, the IC
bias current wil be a slight current (please refer to the electrical characteristics),
and the hall bias output will be cut off. When the [S/S] pin input is high, all the
circuits will work.

It is possible for user to switch the output pulse numeric by external
logic control using FG pulse select terminal [FGS].
Figure 6 shows the FG pulse select function.
The FG pin outputs the square pulse signal synchronizing with the hall
inputs [Hv+ and Hv-] timming when FGS=LOW or OPEN. When
FGS=HIGH, it outputs the square pulse signal of 3 times.
The FG pin is pulled-up to VCC1 by an internal resistor [typ. 10Kohm].

BRAKING MODE SELECT FUNCTION

Braking mode select [BRS] pin

HIGH SHORT BRAKE

OPEN

LOW

Figure 7.

FREE RUN

REVERSE BRAKE

It is possible to select three kinds of mode [the reverse braking,the short
braking and the free run] in reverse torque by logic control using the
BRS terminal.
Figure 7 shows the function table of the braking mode select.
It is the reverse braking when BRS is LOW,the short braking when BRS
is HIGH and the free run when BRS is OPEN.

APPLICATION CIRCUIT

MITSUBISHI <CONTROL / DRIVER IC>

M56787FP

SPINDLE MOTOR DRIVER

104

10µF12V

Control
PWM1

Reference
PWM2

5V

10µF

0.5

V

CC2

EC

ECR

CC1

V

1

N.C

2

N.C

S/S

3

FGS

4

FG

5

C

I

6

BRS

7

8

9

10

11

12

13

14

15

R

S

16

17

18

19

20

HB

21

N.C N.C

CTL

BRAKING

MODE

CHANGE

LIMIT

BIAS..TSD

HALL

BIAS

FG

REVERSE

DETECT

SENSE

120° MATRIX

CURRENT

W

V

U

+-+- +-

N.C

N.C

MGND

TP

42

41

W

40

V

39

U

104

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

104

Please make an open

36

pin(TP) terminal.

Hw-

Hw

Hw+
Hv-

Hv

Hv+
Hu-

Hu

Hu+

104

Hall bias
resistor

AREA OF SAFTY OPERATION

2.0

1.5

1.0

0.5

0.3

Corrector current IC [A]

MITSUBISHI <CONTROL / DRIVER IC>

M56787FP

SPINDLE MOTOR DRIVER

Tpw=500msec [Actual Data]

Tpw=4msec

0.1

Measurement circuits

1 pulse

Emitter current control

512 1034 67

Voltage during corrector and emitter

+

-

VCE [ volt ]

IC

Power supply

VCE

20 30 50

1612

IC

VCE

Tpw

measured
characteristics