SPINDLE MOTOR DRIVER
M56787FP
MITSUBISHI <CONTROL / DRIVER IC>
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.
RS
TSD
UVWVCC1
EC ECRHu+ Hu- Hv+ Hv- Hw+ Hw-
S/S
38 39 40
23 24 25 26 27 28
15
17 18
319
37
MGND
CI
20
HALL
BIAS
HB
16
VCC2
FG
&
SELECT
FG
FGS
GND
BRS 7
6
BRAKING
MODE
CHANGE
BLOCK DIAGRAM
GND
8 to 14
CONTROL
5
4
CURRENT
SENSE & LIMIT
TP
36
1
2
21
22
N.C
N.C
N.C
N.C
REVERSE
DETECT
41 N.C
42 N.C
Hu+
Hw-
Hv-
Hu-
Hv+
Hw+
W
V
GND
RS
CI
EC
HB
GND
U
ECR
MGND
PIN CONFIGURATION
(
TOP VIEW
)
Outline 42P9R-A
S/S
M56787FP
VCC2
FGS
FG
BRS
N.C N.C
N.C N.C
TP
N.C N.C
VCC1
29 to 35
+-+-+-
120˚
MATRIX
42
39
40
41
1
4
3
2
385
376
349
3310
3211
3112
13
14
30
29
7
8
36
35
15 28
16 27
17 26
18 25
19
20
24
23
21 22
N.C: no connection
M56787FP
SPINDLE MOTOR DRIVER
M56787FP
MITSUBISHI <CONTROL / DRIVER IC>
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Limits
5V Power supply Min. Typ. Max. Unit
V
mA
5.04.5 5.5
1000
VCC1
Io Output drive current
VCC2 12V Power supply V13.24.5 12.0
ABSOLUTE MAXIMUM RATING (Ta=25˚C)
VCC1
Io Output current 1.5 A
V
Pt
Kθ
Tj
Tstg
Power dissipation
Thermal derating
Junction temperature
Storage temperature
4.5
W
mW/˚C
˚C
˚C
˚C
1.2
150
-40 – +125
Free Air
Free Air
Symbol Rating Unit
16 V
5V supply voltage V
RS
7.0
VH(c)
Parameter Conditions
Motor supply voltage
Sensor amp.
Differential input range
Topr Operating temperature -20 – +75
9.6
VCC2 12V supply voltage 16 V
*Note2 ; The ICs must be operated within the Pt (power dissipation) or the area of safety operation
Note 2
15 pin
16 pin
19 pin
23 – 28 pins
29 –358 –14
TP
GND
VCC1
GND
Bias for Hall Sensor
EC
ECR
HB 5V supply voltage
Motor speed control
Start / Stop S/S
The reference voltage for EC
Pin No. Symbol Function
FGS FG pulse select
FG Frequency generator output
BRS Reverse torque mode select
CIPhase Compensation
VCC2 12V supply voltage
Pin No. Symbol Function
N.C
N.C
Hw-
Hv-
Hu-
GND
U
GND
Motor drive output U
Hu+ Sensor amp. input
Hw+
Hv+
RS
Hu+
V
W
Motor current sense
Hu- Sensor amp. input
Hv+ Sensor amp. input
Hv- Sensor amp. input
Hw+ Sensor amp. input
Hw- Sensor amp. input
Motor drive output V
Motor drive output W
N.C
N.C
MGND Motor GND
Test
N.C N.C
Note1
2
3
4
5
6
7
15
16
17
18
19
20
21
41
40
39
38
37
36
28
27
26
25
24
23
22
PIN DESCRIPTIONS
142
* 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).
2424
SPINDLE MOTOR DRIVER
M56787FP
MITSUBISHI <CONTROL / DRIVER IC>
THERMAL CHARACTERISTICS
Symbol Parameter Unit
Min. Typ. Max. Min. Typ. Max.
Function start temperature of IC Function stop temperature of IC
TSD Thermal Shut Down 165 ˚C
125
pins
*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.
µA
+600 +30
ELECTRICAL CHARACTERISTICS (VCC1=5V, VCC2=12V , Ta=25˚C unless otherwise noted.)
Symbol Parameter
Isleep Sleep Mode Supply current VCC1& VCC2 pin total Current
(at S/S pin low or open)
Supply currentIcc VCC1& VCC2 pin total Current
(EC=ECR=1.5V) [S/S pin High] mA
Vsat Saturation voltage Top and Bottom saturation voltage.
(Load current :500mA)
ECdead-
ECdead+ Control voltage dead zone EC < ECR
EC > ECR
1.2 1.9 V
-60 -30 0 mV
ECR Reference voltage Input range
EC Control voltage Input range 1.65 V
Conditions Limits
Min. Typ. Max. Unit
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
1.3 4.4
V
mVp-p60
Hall sensor amp
common mode input range
0 3.3
1.650 3.3
10
10
Von
Voff
Motor start voltage [S/S]pin input voltage when it starts up the motor.
*The IC is in the active condition.
*The hall bias are available.
Motor stop voltage
VHb Hall bias terminal output voltage Load current (IHb) =10 mA.
2.0
0.8
V
V
V0.85 1.20.6 mA30
IHb Hall bias terminal sink current
VOL [FG] pin
output low voltage Io current = 1mA 0.5 V
ViH2 2.0 VLogic input high voltage [FGS] input voltage
when it is HIGH.
[S/S]pin input voltage when it stops the motor.
*The IC is in the sleep condition.
*The hall bias are off.
ViL2[FGS] input voltage
when it is LOW.
Logic input
Low voltage 0.8 V
ViH1 3.6 VBRS input high voltage BRS input voltage that the short braking is selected
when the reverse torque.
ViM V2.21.6
BRS input middle voltage BRS input voltage that the free run is selected when
the reverse torque.
0.8 VViL1 BRS input low voltage BRS input voltage that the reverse braking is selected
when the reverse torque.
V
Note3.
pin [3.3V DSP available]
18 pin..[3.3V DSP available]
17
pins23 –28
23 –28
SPINDLE MOTOR DRIVER
M56787FP
MITSUBISHI <CONTROL / DRIVER IC>
The relationshi
p
with I/O control and the brakin
g
mode
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.
BRS=LOW
0
0 – +60mV
0 – -60mV
Current limit
0.8A/V
0.8A/V
Current limit
Forward Torque
EC - ECR
REVERSE BRAKING
Reverse Torque
Figure 1.
EC - ECR
0
0 – -60mV
0.8A/V
Current limit
SHORT BRAKING
Reverse Torque
BRS=Hi
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.
Forward Torque
Figure 2.
0
0 – -60mV
0.8A/V
Current limit
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.
FREE RUN
BRS=Open
Forward Torque
EC - ECR
Figure 3.
SPINDLE MOTOR DRIVER
M56787FP
MITSUBISHI <CONTROL / DRIVER IC>
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.
Ambient Temperature Ta (˚C)
Power Dissipation (Pdp)
0 25 50 75 100 125 150
1.0
2.0
3.0
4.0
5.0
6.0
(W) 4.0W using H-type board
3.0W using I-type board
2.7W using J-type board
THERMAL DERATING
The relationship between the hall amplifier inputs voltage and the
motor current outputs is shown in Figure 4.
HALL AMPLIFIER INPUT AND COMMUTATION
Figure 4.
Hu+
Hv+
Hw+
U
W
V
U
W
W
VUV
U
V
W
Hall elements
Outer loator
FORWARD
EC<ECR
REVERSE
EC>ECR
SINK
SOURSE
Output
current
Hall
inputs U WV V
UVW WU
SPINDLE MOTOR DRIVER
M56787FP
MITSUBISHI <CONTROL / DRIVER IC>
Figure 7.
Figure 5.
Figure 6.
BRAKING MODE SELECT FUNCTIONIt 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.
SLEEP MODE FUNCTION
FG FUNCTION
OPEN
Braking mode select [BRS] pin
LOW
HIGH SHORT BRAKE
FREE RUN
REVERSE BRAKE
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.
START / STOP (S/S pin)
LOW or OPEN HIGH
Motor Stop
Bias off
Hall-Bias off
Motor on
Bias on
Hall-Bias on
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].
FG pulse select (FGS pin)
LOW or OPEN HIGH
NX1 pulse NX3 pulse
SPINDLE MOTOR DRIVER
M56787FP
MITSUBISHI <CONTROL / DRIVER IC>
APPLICATION CIRCUIT
Please make an open
pin(TP) terminal.
Reference
PWM2
+-+- +-
1
2
3
4
5
18
7
21
BRAKING
MODE
CHANGE
FG
REVERSE
DETECT
HALL
BIAS
BIAS..TSD
CURRENT
SENSE
LIMIT
CTL
S/S
FGS
FG
CI
BRS
W
V
U
10µF12V
Hv
Hu
Hall bias
resistor
104
104
104
42
41
40
39
37
38
28
27
26
25
24
23
36
35
34
33
32
31
30
29
22
10µF
5V
104
0.5
Hw-
Hw+
Hv-
Hv+
Hu-
Hu+
TP
MGND
U
V
W
N.C N.C
N.C N.C
HB
VCC1
VCC2
ECR
EC
RS
120° MATRIX
N.C N.C
Control
PWM1
15
6
8
9
10
11
12
13
14
16
17
19
20
Hw
36
SPINDLE MOTOR DRIVER
M56787FP
MITSUBISHI <CONTROL / DRIVER IC>
Voltage during corrector and emitter
VCE [ volt ]
512 1034 67 20 30 50
0.1
1.0
2.0
Corrector current IC [A]
1.5
1612
0.3
0.5
Tpw=4msec
Tpw=500msec [Actual Data]
IC
VCE
1 pulse
+
-
Emitter current control
Power supply IC
VCE
Tpw
measured
characteristics
Measurement circuits
AREA OF SAFTY OPERATION
